Title of Invention	"CAPSULE FORMULATION OF PIRFENIDONE AND PHARMACEUTICALLY ACCEPTABLE EXCIPIENTS"
Abstract	A capsule formulation of pirfenidone is provided that includes pharmaceutically acceptable excipients. In one embodiment, this capsule formulation is capable of sustaining desirable pharmacokinetic responses in a patient. Further provided are methods of treating fibrotic conditions and other cytokine-mediated disorders by administering pirfenidone capsules of such formulation to a patient in need.

Title of Invention

"CAPSULE FORMULATION OF PIRFENIDONE AND PHARMACEUTICALLY ACCEPTABLE EXCIPIENTS"

Abstract

A capsule formulation of pirfenidone is provided that includes pharmaceutically acceptable excipients. In one embodiment, this capsule formulation is capable of sustaining desirable pharmacokinetic responses in a patient. Further provided are methods of treating fibrotic conditions and other cytokine-mediated disorders by administering pirfenidone capsules of such formulation to a patient in need.

Full Text	CAPSULE FORMULATION OF PIRFENIDONE AND PHARMACEUTICALLY ACCEPTABLE EXCIPDENTS BACKGROUND OF THE DISCLOSURE FIELD OF THE DISCLOSURE [0001] The present disclosure relates in general to pirfenidone, a small drug molecule whose chemical name is 5-methyl-l-phenyl-2-(lH)-pyridone. Specifically, the present disclosure relates to a capsule formulation of pirfenidone including pharmaceutically acceptable excipients. Further provided are methods of using such capsule formulation in the treatment of fibrotic conditions and other disorders mediated by cytokines. DESCRIPTION OF THE RELATED ART [0002] Pirfenidone is a non-peptide synthetic molecule with a molecular weight of 185.23 daltons. Its chemical elements are expressed as C^HnNO, and its structure is known. The synthesis of pirfenidone has been worked out. Pirfenidone is manufactured and being evaluated clinically as a broad-spectrum anti-fibrotic drug. Pirfenidone has anti-fibrotic properties via: decreased TNF-a expression, decreased PDGF expression, and decreased collagen expression. Several pirfenidone Investigational New Drug Applications (INDs) are currently on file with the U.S. Food and Drug Administration. Phase II human investigations are ongoing or have recently been completed for pulmonary fibrosis, renal glomerulosclerosis, and liver cirrhosis. There have been other Phase n studies that used pirfenidone to treat benign prostate hypertrophy, hypertrophic scarring (keloids), and rheumatoid arthritis. [0003] One important use of pirfenidone is known to be providing therapeutic benefits to patients suffering from fibrosis conditions such as Hermansky-Pudlak Syndrome (HPS) associated pulmonary fibrosis and idiopathic pulmonary fibrosis (IPF). Pirfenidone demonstrates a pharrnacologic ability to prevent or remove excessive scar tissue found in fibrosis associated with injured tissues including that of lungs, skin, joints, kidneys, prostate glands, and livers. Published and unpublished basic and clinical research suggests that pirfenidone may safely slow or inhibit the progressive enlargement of fibrotic lesions, remove pre-existing fibrotic lesions, and prevent formation of new fibrotic lesions following tissue injuries. [0004] It is understood that one mechanism by which pirfenidone exerts its therapeutic effects is modulating cytokine actions. Pirfenidone is a potent inhibitor of fibrogenic cytokines and TNF-a. It is well documented that pirfenidone inhibits excessive biosynthesis or release of various fibrogenic cytokines such as TGF-fil, bFGF, PDGF, and EOF. Zhang S et al., Australian and New England Journal Ophthalmology, 26; S74-S76, 1998. Experimental reports also show that pirfenidone blocks the synthesis and release of excessive amounts of TNF-a from macrophages and other cells. Cain et al., International Journal Immunopharmacology, 20:685-695 (1998). [0005] As an investigational drug, pirfenidone is provided in tablet and capsule forms principally for oral administration. Various formulations have been tested and adopted in clinical trials and other research and experiments. The effectiveness of a formulation may be determined by a plurality of factors, including the amount of pirfenidone it contains, the kinds and relative amounts of pharmacologically acceptable excipients used, and the target patient profile (e.g., the physiological and genetic conditions, disease prognosis, and demographic characteristics of the patient). Changes in these factors cause changes in pharmacokinetic (PK) responses in the patient. Thus, there is a need in general for effective pharmaceutical formulations that elicit desirable pharmacokinetic responses in patients thereby optimizing therapeutic actions of pirfenidone. SUMMARY OF THE VARIOUS EMBODIMENTS [0006] It is therefore an object of this disclosure to provide pharmaceutical formulations of pirfenidone capable of advantageous therapeutic actions. It is a related object to provide pharmaceutical formulations of pirfenidone capable of eliciting and sustaining desirable pharmacokinetic responses in the patient hi need thereof. It is another object of this disclosure to provide methods for treating fibrotic conditions and other cytokine-mediated disorders using such formulations. [0007] Li accordance with this disclosure, there is provided, in one embodiment, a capsule having a pharmaceutical formulation of 5-methyl-l-phenyl-2-(lH)-pyridone (pirfenidone), which includes 5-30% of pharmaceuticaHy acceptable excipients and 70-95% of pirfenidone by weight. [0008] According to another embodiment, the excipients include disintegrators, binders, fillers, and lubricants. Examples of disintegrators include agar-agar, algins, calcium carbonate, carboxmethylcellulose, cellulose, clays, colloid silicon dioxide, croscarmellose sodium, crospovidone, gums, magnesium aluminium silicate, methylcellulose, polacrilin potassium, sodium alginate, low substituted hydroxypropylcellulose, and cross-linked polyvinylpyrrolidone hydroxypropylcellulose, sodium starch glycolate, and starch. Examples of binders include microcrystalline cellulose, hydroxymethyl cellulose, hydroxypropylcellulose, and polyvinylpyrrolidone. Examples of fillers include calcium carbonate, calcium phosphate, dibasic calcium phosphate, tribasic calcium sulfate, calcium carboxymethylcellulose, cellulose, dextrin derivatives, dextrin, dextrose, fructose, lactitol, lactose, magnesium carbonate, magnesium oxide, maltitol, maltodextrins, maltose, sorbitol, starch, sucrose, sugar, and xylitol. Examples of lubricants include agar, calcium stearate, ethyl oleate, ethyl laureate, glycerin, glyceryl palmitostearate, hydrogenated vegetable oil, magnesium oxide, magnesium stearate, mannitol, poloxamer, glycols, sodium benzoate, sodium lauryl sulfate, sodium stearyl, sorbitol, stearic acid, talc, and zinc stearate. [0009] According to yet another embodiment, by weight 2-10% of the capsule is disintegrator, 2-30% is binder, 2-30% is filler, and 0.3-0.8% is lubricant. In another embodiment, by weight 2-10% of the capsule is disintegrator, 2-25% is binder, 2-25% is filler, and 0.3-0.8% is lubricant. According to still another embodiment, the excipients further include povidone. In a further embodiment, by weight 1-4% of the capsule is povidone. According to another embodiment, the capsule includes 100-400 mg Pirfenidone. [0010] In accordance with mis disclosure, there is provided, in another embodiment, a method for treating a fibrotic condition. The method comprises administering the aforementioned capsule to a patient suffering from the fibrotic condition. Examples of such fibrotic conditions include pulmonary fibrosis, hepatic fibrosis, cardiac fibrosis, keloid, dermal fibrosis, coronary restenosis, and post-surgical adhesions. Examples of pulmonary fibrosis include idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndromes. [0011] In accordance with this disclosure, there is provided, in yet another embodiment, a method for inhibiting actions of cytokines in a patient suffering from a disorder mediated by such cytokines. The method comprises administering the aforementioned capsule to the patient. Examples of such cytokines include TNF-a, TGF- 131, bFGF, PDGF, and EOF. Examples of such disorder include multiple sclerosis, arthritis, asthma, chronic rhinitis, and edema. In still another embodiment, the method further comprises administering one or more capsules to the patient one or more times a day, with a total daily intake of pirfenidone greater than 1200 mg. In various embodiments, the patient is given one or more capsules twice or three times a day. [0012] In accordance with this disclosure, there is provided, in still another embodiment, a capsule having an effective amount of pirfenidone and pharmaceutically acceptable excipients. The capsule when administered in a patient is capable of sustaining a measurable pharmacokinetic response. The pharmacokinetic response is characterized by a one or more fold increase in the Tmax or AUC values than a pirfenidone capsule containing no pharmaceutically acceptable excipients. In various embodiments, treatment methods of administering such capsules are provided for patients suffering from fibrotic conditions such as idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndrome, and other disorders mediated by cytokines such as TNF-a, TGF-fll, bFGF, PDGF, and EOF. BRIEF DESCRIPTION OF THE DRAWINGS [0013] Figure 1 shows changes in the mean serum concentrations of pirfenidone and its metabolite 5-carboxylic acid over time in human subjects included in one of the previously reported pharmacokinetic studies: Shionogi Phase II. [0014] Figure 2 is a table that shows quantitative compositions of the pirfenidone tablets used in Shionogi Phase II. [0015] Figure 3 shows changes in pirfenidone serum concentrations over time in human subjects after a single dose of 400 mg pirfenidone delivered orally in capsules without excipients. [0016] Figure 4 shows changes in pirfenidone serum concentrations over time in human objects following a single dose of 200-300 mg pirfenidone delivered orally in capsules with excipients, according to one embodiment of this disclosure. [0017] Figure 5 is a table that shows the PK values of the capsules with excipients according to one embodiment of this disclosure, compared to the PK values of capsules without excipients that were used in Schmidt 1974, one of the previously reported PK studies. [0018] Figure 6 is a table that shows the formulation of pirfenidone/excipient- containing capsules used in the study depicted in Figure 4 and the study depicted in Figure 8a-c. [0019] Figure 7 is a table that lists the components used to prepare a representative batch of the pirfenidone/excipient formulation of Figure 6. [0020] Figures 8a-c lists tables that show the stability of the pirfenidone/excipient formulation of Figure 6 at 25°C and 60% relative humidity (Figure 8a), 35°C and 65% relative humidity (Figure 8b), and 40°C and 75% relative humidity (Figure 8c). [0021] Figures 9a and 9b depict additional representative formulation of pirfenidone/excipient-containing capsules contemplated herein. DETAILED DESCRIPTION OF THE VARIOUS EMBODIMENTS Discussion Of The Relevant Terms [0022] Throughout the present disclosure relevant terms are to be understood consistently with their typical meanings established in the relevant art, i.e. the art of pharmaceutical chemistry, medicine, biology, genetics, molecular biology, biochemistry, physiology, genomics, pharmacogenomics, bioinformatics, computational biology, and cheminfomatics. However, further clarifications and descriptions are provided for certain terms as set forth below: [0023] The terms pharmaceuticals, pharmaceutical products, drug products, drug chemicals, drug compounds, compounds, and chemicals, are used interchangeably throughout this disclosure. [0024] API, as used herein, refers to active pharmaceutical ingredients. In various embodiments of this disclosure, the API of the capsule and tablet formulations is pirfenidone. [0025] The terms pharmaceutically acceptable excipients, pharmaceutically compatible excipients, and excipients are used interchangeably in this disclosure. They refer to non-API substances such as disintegrators, binders, fillers, and lubricants used in formulating pharmaceutical products. They are generally safe for administering to humans according to established governmental standards, including those promulgated by the United States Food and Drug Administration. [0026] Disintegrators, as used herein, refer to one or more of agar-agar, algins, calcium carbonate, carboxmethylcellulose, cellulose, clays, colloid silicon dioxide, croscarmellose sodium, crospovidone, gums, magnesium aluminium silicate, methylcellulose, polacrilin potassium, sodium alginate, low substituted hydroxypropylcellulose, and cross-linked polyvinylpyrroh'done hydroxypropylcellulose, sodium starch glycolate, and starch. [0027] Binders, as used herein, refer to one or more of microcrystalline cellulose, hydroxymethyl cellulose, hydroxypropylcellulose, and polyvinylpyrrolidone. [0028] Fillers, as used herein, refer to one or more of calcium carbonate, calcium phosphate, dibasic calcium phosphate, tribasic calcium sulfate, calcium carboxymethylcellulose, cellulose, dextrin derivatives, dextrin, dextrose, fructose, lactitol, lactose, magnesium carbonate, magnesium oxide, maltitol, maltodextrins, maltose, sorbitol, starch, sucrose, sugar, and xylitol. [0029] Lubricants, as used herein, refer to one or more of agar, calcium stearate, ethyl oleate, ethyl laureate, glycerin, glyceryl palmitostearate, hydrogenated vegetable oil, magnesium oxide, magnesium stearate, mannitol, poloxamer, glycols, sodium benzoate, sodium lauryl sulfate, sodium stearyl, sorbitol, stearic acid, talc, and zinc stearate. [0030] Capsule, as used herein, refers to a generally safe, readily dissolvable enclosure for carrying certain pharmaceutical products. In one embodiment, capsule is made of gelatin. Other suitable matrix substances such as total synthetic polymer chemicals having gelatin-like properties may be used to manufacture pirfenidone capsules according to alternative embodiments of this disclosure. [0031] AUC, as used herein, refers to the area under the curve that represents changes in blood concentrations of pirfenidone over time. [0032] CmaX5 as used herein, refers to the maximum value of blood concentration shown on the curve that represents changes in blood concentrations of pirfenidone over time. [0033] Tmax, as used herein, refers to the time that it takes for pirfenidone blood concentration to reach the maximum value. [0034] Ti/2, as used in this disclosure, refers to the time that it takes for pirfenidone blood concentration to decline to one-half of the maximum level. [0035] Collectively AUC, Cmax, T^ax, and Ti/2 are the principle pharmacokinetic parameters that characterize the pharmacokinetic responses of a particular drug product such as pirfenidone in an animal or human subject. Reported Pharmacokinetic Studies On Pirfenidone [0036] Several pharmacokinetic studies on human subjects have been reported, including one in healthy adult males (Schmidt RM, Ritter A and Margolin S, 1974 Unavailability of Pirfenidone Capsules Following Oral Administration (Human Volunteers) (60-244-73), October 11,1974. Affiliated Medical Research, Inc., Princeton, New Jersey, hereafter "Schmidt 1974"), and two in patients with pulmonary fibrosis (Nagai S, Hamada K, Shigematsu M, Taniyama M, Yamauchi S and Izumi T, 2002, Open Label Compassionate Use One Year-Treatment with Pirfenidone to Patients with Chronic Pulmonary Fibrosis, Intern Med 41: 1118-1123, hereafter "Nagai 2002"; and AzumaA, Nukiwa T, Tsuboi E et al, 2005, Double-Blind, Placebo Controlled Trial of Pirfenidone in Patients with Idiopathic Pulmonary Fibrosis, Am J Respir Crit Care Med., hereafter "Shionogi Phase II"). [0037] Schmidt 1974 examined the pharmacoldneti.es of single dose pirfenidone. Pirfenidone was administered orally to 10 healthy adult males at doses of 100,200, and 400 mg. On day 1, a single dose of 100 nag was given to each subject. On day 3, a single dose of 200 mg was given to each subject. And on day 4, a last single dose of 400 mg was given to each subject. This last single dose of 400 mg was analyzed for pharmacokinetics. Blood plasma samples were collected before dosing and at 0.25, 1,4, and 6 hr after dosing. Pirfenidone concentrations in plasma were determined by gas chromatography. The resulting values of pharmacokinetic parameters are: Cmax = 6.3 + 2.5 ug/mL, Tmax = 0.9 ± 0.3 hrs, AUC6hr = 20.8 + 10.0 ug/mL-hr, andTi/a = 2.2 ± 0.6 hrs. [0038] Nagai 2002 involved 10 male patients with pulmonary fibrosis. The subjects underwent dose escalation starting with an initial dose of 400 mg for several days to a maintenance dose of 40 mg/kg/day. Pharmacokinetics analyses were done on each of the 10 subjects on day 1 when a dose of 400 mg was given. Plasma samples were collected at 0, 0.25,1,1.5,2,4, 6, 8, and 24 hr after dosing. The values of pharmacokinetic parameters were computed. Cmax was 3.0 to 7.2 ug/mL, and AUC24hr I was 16.9 to 66.4 ng/mL-hr. [0039] • Shionogi Phase II involved serial sampling in a 15-patient subset of a pirfenidone cohort (13 males and 2 females). On day 1 a 200 mg single dose was given to each of the 15 patients, and serum samples were collected before dosing and at 0.5,1, 2, and 3 hr after dosing. Blood concentrations of pirfenidone were determined by HPLC assay. Figure 1 demonstrates changes in the observed mean serum concentrations of pirfenidone and its metabolite 5-carboxylic acid over time. The values of pharmacokinetic parameters were computed to be: Cmax = 2.7 + 0.7 pg/mL, Tmax = 1.8 + 1.1 hrs, AUC4hr = 7.3 ± 1.6 \|ag/mL-hr, and Tia = 3.5 ±2.2 hrs. [0040] The drug formulations in these previously reported studies were different. Schmidt 1974 used a capsule including 100% pirfenidone. Nagai 2002 and Shionogi Phase II used pirfenidone tablets that included certain pharmaceutically acceptable excipients For example, the drug product used in Shionogi Phase II was formulated as compressed, coated tablets of 200 mg of pirfenidone. Shionogi Phase II tablets included pharmaceutically acceptable excipients. Figure 2 is a table listing the ingredients of the Shionogi Phase II tablets and the quantities of each ingredient. As shown, the core tablet was 285 mg, of which 200 mg was API Various amounts of disintegrator, filler, binder, and lubricant were included. With the addition of the coating, the total weight of the Shionogi Phase II tablet was 296.4 mg. [0041] One additional pharmacokinetic study was conducted on a single dose of four 100 mg capsules each containing 100% pirfenidone. Ten human volunteers were included in this study. At 15 minutes after oral ingestion of 400 mg pirfenidone, the jUct •'•'-• average serum concentration of pirfenidone reached 3.97 aaig/mL. At one hour, the average serum concentration was measured to be 5.57 aig/mL, and at six hour 1.63 Hag/inL. Figure 3 is a plot of serum pirfenidone levels over time summarizing this study. As shown, the maximum serum pirfenidone level was reached between one and three hours. The value of 1\n was calculated to be 2.87 + 0.22 hrs. Capsule Formulation Of Pirfenidone With Excipients [0042] To those skilled in the pharmaceutical research and manufacturing, it is generally known that tablet formulations permit generous additions of non-API ingredients including excipients and coating substances, especially high percentage of fillers. However, the addition of non-API ingredients may limit the amount of API carried in each tablet. By contrast, capsule formulations tend to facilitate the inclusion of high percentage of API with no or less non-API components. Capsules may allow for inclusion of a larger amount of binders, instead of fillers as used more hi tablets. Where high percentage of API is desired and specific excipients are not known to be essential, capsule formulations are often adopted. [0043] To be sure, no capsule formulation of pirfenidone manufactured or reported to date contains excipients. The present disclosure provides a new pirfenidone capsule formulation with certain pharmaceutically acceptable excipients. According to one embodiment, this new capsule formulation is capable of eliciting advantageous pharmacokinetic responses in human subjects, hi another embodiment, this new capsule formulation facilitates dissolution and improves flowability in the capsule manufacturing process. [0044] This capsule formulation includes 100-400 mg pirfenidone. One or more pharmaceutically acceptable excipients are added in various embodiments. For example, in one embodiment, by weight 2-10% of the capsule is disintegrator, 2-30% is binder, 2-30% is filler, and 0.3-0.8% is lubricant. As described in the beginning of this Detailed Description, a multitude of substances maybe suitably included as disintegrator, binder, filler, and lubricant. One example is to use magnesium stearate as lubricant, microcrystalline cellulose as binder, and croscannellose as disintegrator. In a particular embodiment, the capsule formulation further includes povidone. By weight povidone may constitute 1-4% of the capsule. [0045] The capsule shell may be made of hard gelatin in one embodiment. The shell may be clear or opaque, white or with color in various embodiments. The capsule is size 1 in a preferred embodiment. Other sizes may be adopted in alternative embodiments. [0046] The manufacture of pirfenidone capsules based on the capsule formulation of the various embodiments includes a series of steps. These steps are: preparing pirfenidone granulation, fluid bed drying, milling, lubrication blend, encapsulation, and bulk packaging [0047] The preparation of pirfenidone granulation may be done in the following sequence. First, povidone is mixed with water and dissolved using an overhead mixer. Second, pirfenidone is milled with croscannellose and microcrystalline cellulose to break up any lumps. Third, the milled pirfenidone, croscannellose, and microcrystalline cellulose are added into a high sheer granulate and blended. Fourth, the povidone and water solution is added to the blend. Fifth, the pirfenidone granulation is blended for an additional period of time after the povidone and water solution have been completely added. [0048] The fluid bed drying process may be preformed on a Fluid Bed Dryer with an inlet temperature of 60°C. The milling process may be preformed using a suitable miller such as Quadro Comil®. The lubrication blend process may be conducted with the addition of an appropriate amount of croscannellose and magnesium stearate. The pirfenidone granulation may be further blended at this point. Next, the pirfenidone granulation is encapsulated using a suitable encapsulator into two-piece, size 1, gelatin capsules to yield a desired pirfenidone dose of 100-400 mg. The dose of 200-300 mg is yielded in a preferred embodiment. To conclude the capsule manufacturing process, finished capsules may be packaged in secured, double polybags and stored at controlled room temperature. Those skilled in drug research and drug making will appreciate that certain of the aforementioned steps maybe modified or omitted, and additional steps may be included, without materially alter the outcome of the manufacturing. [0049] An exemplary composition of the pirfenidone/excipient formulation-containing capsules that was prepared and tested is provided in Figure 6. A representative batch of the pirfenidone/excipient formulation was prepared using routine wet formulation methods to combine the components listed in Figure 7. [0050] Pharmacokinetic studies were performed on the pirfenidone capsules of the present disclosure. A first study depicted in Figure 4 shows average changes in serum concentrations over time in four groups of subjects to whom were administered a single dose of the 267 mg pirfenidone capsule formulation of Figure 6. The four lines of this graph, A, B, C and D, represent four different groups of subjects: A, fasted subjects; B 1 fasted subjects with anatacid administered; C fed subjects; and D fed subjects with anatacid administered. [0051] In another pharmacokinetic study, two groups of human subjects on normal diet were included, each having 13 subjects. One group (Group I) received no antacid, while the other group (Group II) received antacid. The 267 mg pirfenidone capsule formulation of Figure 6 was given to each subject. Figure 5 is a table summarizing the resulting PK values for both groups (Capsule Groups I and IT), compared to the PK values reported in Schmidt 1974. As demonstrated in Figure 5, Tmax is significantly longer (an approximately two-fold increase in each of Groups I and II) for these excipient-containing capsules than what was reported in Schmidt 1974. AUC is also significantly higher (increased by about two-fold in each of Groups I and II) for these excipient-containing capsules than what was reported hi Schmidt 1974. AUC values are computed over a time period of zero to infinity. The values of Cmax. and Ti/2 are also higher than or comparable with those reported in Schmidt. [0052] These resulting PK values, especially the increased Tmax and AUC, indicate a prolonged absorption phase for the pirfenidone capsules with excipients according to the present disclosure. Consequently, these capsules are capable of sustaining prolonged therapeutic actions in a patient. Therefore, compared to the capsules without excipients, as what were used in Schmidt 1974, the capsule formulation with the excipients may be advantageously administered to a patient in need, thereby eliciting desirable pharmacokinetic responses in the patient. Whilst such desirable PK responses are surprising results, it is conceivable that binders such as microcrystalline cellulose or povidone favorably interact with the amide carbonyl group of pirfenidone forming a transient complex which may then dissociate, resulting in a slow build-up in the plasma concentration of pirfenidone, or a slow decline or clearance in the plasma concentration. [0053] Based on the longer Tmax and 1\n, a simplified dosing regimen, e.g., changing from three times a day to twice a day, may be implemented, which is likely to result in greater patient compliance. In addition, higher Cmax values suggest that daily dosages may be reduced without altering the therapeutic effects of pirfenidone. A reduced daily dosage may lead to reduction or elimination of toxicity and other adverse effects of the drug. [0054] In addition to the therapeutic advantages of the pirfenidone/excipient formulations provided herein, these capsules and the formulations also show good stability under various storage conditions over time. In some embodiments, under various storage conditions the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. For example, under storage conditions of 25°C and 60% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. In another example, under storage conditions of 30°C and 65% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. In another example, under storage conditions of 40°C and 75% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, or 12 months. [0055] la some embodiments, the stability of the capsules and pirfenidone/excipient formulations provided herein is determined by measuring the dissolution rate of the stored capsule and/or pirfenidone/excipient formulations. Any of a variety of dissolution methods provided herein or otherwise known in the art can be performed to determine the stability of capsules and pirfenidone/excipient formulations. Dissolution measurements are in vitro methods known in the art to be representative of in vivo Tmax and AUC values. Accordingly, the stability of the capsules and pirfenidone/excipient formulations as measured by dissolution methods will be representative of the in vivo Tmax and AUC values of a subject when the capsules and pirfenidone/excipient formulations after storage, for example, under the above-exemplified conditions for the indicated amount of time. Typically, a dissolution level indicative of an acceptable level of stability is a dissolution of at least, or at least about 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or more, of the pirfenidone in the capsules provided herein. Any of a variety of dissolution methods provided herein or otherwise known in the art can be performed to determine the stability of capsules and pirfenidone/excipient formulations. For example, dissolution can be determined according to the pharmacopoeial dissolution method specified in USP29. [0056] The stability of the capsules and pirfenidone/excipient formulations provided herein is demonstrated in the results presented in Figure 8. The 267 mg pirfenidone capsule formulation of Figure 6 was stored for 18 months under three different storage conditions: 25°C and 60% relative humidity, 30°C and 65% relative humidity, and 40°C and 75% relative humidity. Figure 8 shows that the dissolution of the capsule and pirfenidone/excipient formuations at 25°C and 60% relative humidity, 30°C and 65% relative humidity did not appreciably change over the duration of the 18 month period. The dissolution of the capsule and pirfenidone/excipient formuations at 40°C and 75% relative humidity did not appreciably change over the initial 12 month period. The dissolution analysis was performed according to the pharmacopoeial dissolution method specified in USP29 using Apparatus 2 (paddles) with water as a solvent and a specification of Q=70% of label claim in 30 minutes. Also shown in Figure 8, the level of impurities in each formulation, as determined by HPLC, was less than 0.05% over the duration of the 18 month period, hi addition, Hie moisture content, as determined by the Karl Fischer method, of all but one time point (40°C, 75% RH at 18 months) remained below 2%, and the moisture content of all samples remained below 2.5% over the duration of the 18 month period. Finally, the percent of pirfenidone in each sample, as determined by HPLC, showed no appreciable degradation over the 18 month period. [0057] hi addition to the specific formulation provided herein in Figure 6, further formulations contemplated herein are provided in Figure 9a and 9b. Therapeutic Indications [0058] One embodiment of this disclosure provides methods for treating fibrotic conditions and other cytokine-niediated disorders. These methods comprise administering the excipients-containing pirfenidone capsules of this disclosure to a patient suffering from a fibrotic condition or a cytokine-niediated disorder. The dosing may be twice or three times daily, with one or more capsules per intake. According to a particularly embodiment, the total daily intake is at least 1200 mg pirfenidone. The total daily intake amount may vary, depending on the patient profile, including among other things the patient's demographic characteristics, physiological and genetic conditions, and disease prognosis. For example, a child or a senior person may be given a lower amount daily than that given to an ordinary adult. [0059] The anti-fibrotic activity of pirfenidone is demonstrated in in vivo animal fibrosis models, as well as-in vitro cell culture studies with human or animal lung fibroblasts, dermal fibroblasts, and fibroblast-like cells. Those data indicates that pirfenidone may be an effective agent for preventing and treating post-surgical adhesions, myocardial fibrosis, renal fibrosis, liver cirrhosis, atherosclerosis, and other fibrotic disorders. In vitro cell cultures with human mesenchymal-like cells (including lung fibroblasts, skin fibroblasts, prostate strornal cells, and renal mesangial cells, etc) have shown pharmacologic inhibition by pirfenidone of excessive cell proliferation induced by cytokine growth factors (TGF-M, bFGF, PDGF, and EOF), hi cell culture media, graded concentrations of pirfenidone were effective at levels which were ten to twenty times lower than those exerting any pharmacologically toxic effects on the cells. [0060] At the site of injury, otherwise normal resident cells (e.g., fibroblasts, pericytes,, mesangial cells, astrocytes, microglia, and oligodendrocytes) manufacture and discharge high concentrations of growth factors into adjacent tissue spaces. These resident sources of pathologically high levels of growth factors are directly responsible for the persistently excessive levels of growth factors. They cause excessive and harmful formation of collagen or amyloid matrix as well as damage to adjacent cells, the associated organ dysfunction, and frequently, organ malformation. [0061] TGF-151 is a potent growth-related peptide whose effects may be observed at femtomolar concentrations. It appears to be ubiquitous, and is a bifunctional regulator of cell proliferation in vitro. It acts either as a mitogen or a growth inhibitor depending on tissue concentration and the state of cell confluence (LJ. Striker et al., Lab. Invest. 64:446-456,1991). In skin incisions, after attracting macrophages and fibroblasts, TGF-131 enhances extracellular matrix formation by increasing transcription of genes for collagen and fibronectin, decreasing secretion of proteases, increasing secretion of protease inhibitors, and increasing transcription of cellular receptors for matrix proteins. [0062] The anti-fibrotic activities of pirfenidone have been demonstrated in vivo in laboratory animals with fibrotic lesions, in vitro with human lung fibroblast (WI38) cell cultures, and observed through pilot open trials in patients with severe pulmonary fibrosis, benign prostate hypertrophy, or keloids. Pirfenidone may selectively arrest scar enlargement, and remodels or removes scar tissue or fibrosis. The dysfunction caused by fibrotic lesions may be ameliorated by the reduction or removal of the fibrotic lesion following pirfenidone treatment. Apparently organ and tissue function can be restored, even after the presence of fibrosis for several years. When given immediately after an insult, such as trauma, infection, or allergy, to a tissue, pirfenidone also may prevent formation of excessive scar tissue, or fibrotic lesions, and thus help retain normal function and appearance of the tissue. [0063] Pirfenidone may cause removal of excessive collagenous fibrotic tissue by a phagocytic action of local fibroblasts. This has been observed by examination of histological sections of lung tissue under the light microscope from dogs, mice, rats, and hamsters with pulmonary fibrosis treated with pirfenidone, and also through the electron micrographs of histological sections of lung tissue taken from hamsters with experimentally-induced asbestosis that were treated with pirfenidone. No infiltration of inflammation-inducing neutrophils, PMN cells, monocytes, lymphocytes occurred. [0064] The enhanced proliferation of WI38 fibroblasts upon in vitro exposure to PDGF or bFGF may be blocked by pirfenidone added to cell growth media. Pirfenidone may also inhibit the TGF-B1 induced rise in collagen output hi lung and dermal fibroblast cultures. [0065] The human clinical findings after treatment with pirfenidone have been consistent with the anti-fibrotic effects observed hi the laboratory animals. Pilot open clinical trials with oral pirfenidone have been undertaken with patients afflicted with pulmonary asbestosis, bleomycin-induced pulmonary fibrosis, idiopathic pulmonary fibrosis, scleroderma with pulmonary fibrosis, and Hermansky-Pudlak Syndrome characterized by pulmonary fibrosis. [0066] The clinical criteria for beneficial response during the first months on pirfenidone included reduction in incidence of coughs, reduction in supplemental oxygen requirements, increased exercise tolerance, reduced dyspnea during exercise, amelioration of cor pulmonale, resumption of normal daily tasks, body weight gain, and survival. During the early months, pulmonary function as gauged by chest x-ray, spirometry, or CO diffusion (DLCO) showed little, if any, change. However, after 4 to 6 months on pirfenidone, inhibition or blocking of further deterioration hi lung function was evidenced by pulmonary function tests, vital capacity (VC), in the diffusing capacity of the lung for carbon monoxide (DLCO). These overall observations compare favorably with those described by Van Barneveld et al. (Amer. Rev. Respr. Dis., vol. 135,48-51, 1987), during the spontaneous recovery by patients from bleomycin-induced pulmonary pneumonitis (early stage fibrosis). [0067] Martinet et al. (NE Jour. Med., vol 317,202-209,1987) have described an exaggerated release of PDGF by alveolar macrophages hi patients with idiopathic pulmonary fibrosis. The in vitro demonstration of inhibition by pirfenidone of the mitogenesis and enhanced formation of collagen caused by growth factors (bFGF, PDGF, and TGF- 61) may partly explain the beneficial in vivo anti-fibrotic action of pirfenidone. [0068] hi an open pilot trial of pirfenidone in older men with clinically advanced benign prostate hypertrophy (BPH, non-cancerous fibrous enlargement of the male prostate gland), the patients experienced functional improvement based on objective criteria. After taking oral pirfenidone the frequent urinary bladder urgency was ameliorated, and nocturia rarely recurred. In another pilot open trial, topical applications of pirfenidone ointment to surgical sites immediately after keloid resection has prevented recurrence of the keloids as observed in two-year follow-ups in the patients. Each of those patients had a prior history of repeated early keloid re-growths after such surgery. Pirfenidone may induce a remodeling of skin fibrotic lesions to reduce or remove keloids, reduce or remove dermal scars, and remove or lessen the contractures of hypertrophic (post burn injury) scars. In a similar condition, pirfenidone also acts to inhibitpost-operative surgical adhesions. [0069] Thus, clinical investigations under both controlled protocol designs and open label trials have demonstrated that pirfenidone exerts anti-fibrotic and cytoprotective actions. The observed side effects after oral administration were relatively mild (drowsiness, gastric nausea or photosensitivity rash). No serious adverse reactions have been reported. [0070] In summary, based on the TNF-a inhibitor (cytoprotective) activity of pirfenidone, the capsule formulation of the present disclosure maybe administered according to certain embodiments of this disclosure to treat patients suffering from the following disorders: [0071] 1) Central Nervous System syndromes: relapsing-remitting multiple sclerosis, primary and secondary multiple sclerosis, spinal multiple sclerosis, cerebral malaria, viral or bacterial infections of the CNS, bacterial meningitis, "autoimmune" disorders of the central nervous system (CNS), CNS stroke and infarction, brain edema, Parkinson's syndrome, Alzheimer's disease, amylotrophic lateral sclerosis (ALS), and brain concussion or contusion; [0072] 2) Musculo-skeletal syndromes: rheumatoid arthritis, trauma-induced arthritis, arthritis caused by a microbial infection, or by a parasite, tendonitis, and, arthritis induced by medical products or drugs (including small synthetic molecules as well as purified natural or synthesized peptides or proteins); [0073] 3) Pulmonary syndromes: acute adult respiratory distress syndrome, asthma, allergic rhinitis, allergic conjunctivitis, chronic obstructive pulmonary disease (COPD), and lung sarcoidosis; [0074] 4) Systemic immunologic, inflammatory or toxic syndromes: endotoxemia shock syndrome, septic shock, graft-host disease, allograft vasculopathy, hemorrhagic shock, reperfusion injury of the brain or myocardium, thermal bums, radiation injury, general or dermal traumatic or contusion injuries, eosinophilic granuloma, diabetic mellitus (type II), or systemic lupus erythromatosus; [0075] 5) Gastro-intestinal syndromes: Crohn's disease, ulcerative colitis, and liver inflammatory disorders; and [0076] 6) Congestive heart failure. [0077] Further, based on the anti-fibrotic activity of pirfenidone, the capsule formulation of the present disclosure may be administered according to other embodiments to treat patients suffering from the following disorders: pulmonary fibrosis, radiation and drug-induced lung fibrosis, hepatic fibrosis, cardiac fibrosis, .keloid, post-surgical adhesions, benign prostate hypertrophy in humans, arteriosclerosis, dermal fibrosis, and coronary restenosis. [0078] It is to be understood that the description, specific examples and data, while indicating exemplary embodiments, are given by way of illustration and are not intended to limit the various embodiments of the present disclosure. All references cited herein for any reason, are specifically and entirely incorporated by reference. Various changes and modifications within the present disclosure will become apparent to the skilled artisan from the description and data contained herein, and thus are considered part of the various embodiments of this disclosure. WHAT IS CLAIMKD IS: 1. A capsule comprising a pharmaceutical formulation of 5-methyl-l -phenyl- 2-(lH)-pyridone, wherein said pharmaceutical formulation comprises, by weight, 5-30% of pharmaceutical ly acceptable excipients and 70-95% of 5-methyl-l-phenyl-2-(lH>- pyridone. 2. The capsule of claim 1, wherein said excipients comprise one or more disintegrators, binders, fillers, and lubricants. 3. The capsule of claim 2, wherein said disintegrators comprise one or more of agar-agar. algins, calcium carbonate, carboxraethylcellulose, cellulose, clays, colloid silicon dioxide, croscarmellose sodium, crospovidone, gums, magnesium aluminium silicate, mcthylcellulose, polacrilin potassium, sodium alginatc, low substituted hydroxypropylcellulosc, and cross-linked polyvinylpyrrolidone hydroxypropylcellulosc, sodium starch glycolate, and starch. 4. The capsule of claim 2, wherein said binders comprise one or more of microciystallme cellulose, hydroxymcthyl cellulose, hydroxypropylcellulose, and polyvinylpyrrolidone. 5. The capsule of claim 2. wherein said fillers comprise one or more of calcium carbonate, calcium phosphate, dibasic calcium phosphate, tribasic calcium sulfate, calcium carboxymethylcellulose, cellulose, dextrates, dextrin, dextrose, fructose. lactitol, lactose, magnesium carbonate, magnesium oxide, maiitol, maltodextrins, maltose, sorbitol. starch, sncrn.se, sugar, and xylitol. 6. The capsule of claim 2, wherein said lubricants comprise one or more of agar, calcium stearate, ethyl olcatc, ethyl laureate, glycerin, gjyceryl palmitostcarate, hydrogenated vegetable oil, magnesium oxide, magnesium stearate, mannitol, poloxamer, giycols, sodium ben/oatc, sodium lauryl sulfale, sodium stearyl, sorbitol, stearic acid, talc, and zinc stearnte. 7. The capsule of claim 2, wherein by weight said disintegrator is 2-10%, said binder is 2-30%, said filler is 2-30%, and said lubricant is 0,3-0.8%. 8. The capsule of claim 2, wherein said excipients further comprise povidone. 9. The capsxile of claim 8, wherein by weight said povidone is 1 -4%. 10. The capsule of claim 9, wherein the capsule comprises 100-400 mg 5- methyl-1 -phenyl-2-( 1 H)-pyridonc. 11. A capsule comprising an effective amount of 5-methyl--1 -phenyl-2-( IH)- pyridone and pharmaceutically acceptable excipients. wherein said capsule is capable of sustaining a measurable phannacokinetic response in a patient, wherein said pharmacokinetic response is characterized by a one or more fold increase in the T,,m values compared to a capsule of 5-methyl- l-phenyl-2-(lH)-pyridone containing no phannaceutically acceptable excipients. 12. A capsule comprising an effective amount of 5-methyl-1 -phenyl-2-( 1H)- pyridone and pharmaceutically acceptable excipients, wherein said capsule is capable of sustaining a measurable phannacokinetic response in a patient, wherein said pharmacokinetic response is characterized by a one or more fold increase in the ADC values compared to a capsule of 5-methyl- l-phenyl-2-(lH)-pyridone containing no phannaceutically acceptable excipients. 13. The capsule of claim 11 or 12, wherein the excipients comprise one or more disintegrators, binders, fillers, and lubricants. 14. The capsule of claim 12, wherein the excipients further comprise povidone. 15. A capsule for treating a fibrotic condition, wherein the capsule is as defined in any one of claims 1, 11, or 12. 16. The capsule of claim 15, wherein said fibrotic condition is one of pulmonary fibrosis, hepatic fibrosis, cardiac fibrosis, keloid, derma! fibrosis, coronary rcstenosis, and post-surgical adhesions. 17. The capsule of claim 1 (>, wherein said pulmonary fibrosis is one of idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndrome. 18. A capsule for inhibiting actions of cytokines in a patient suffering from a disorder mediated thereby, wherein the capsule is as defined in any one of claims 1,11, or 12. 19. The capsule of claim 18, wherein said cytokines comprise one or more of TNF-o, TGF-/31, bFGF, PDGF, and EOF. 20. The capsule of claim 19, wherein said disorder is one of multiple sclerosis, arthritis, asthma, chronic rhinitis, and edema. 21. The capsule of claim 15 or 18, wherein the capsule is for administering one or more said capsules to said patient one or more times a day, wherein the total intake of 5-methyl-l-phenyJ-2-(lH)-pyridone is at least 1200 mg a day. 22. The capsule of claim 21, wherein said one or more capsules are administered to the patient twice a day. 23. The capsule of claim 22, wherein said one or more capsules are administered to the patient three times a day. 24. The capsule of claim 15, wherein by weight said disintegrator is 2-10%, said binder is 2-25%, said filler is 2-25%, and said lubricant is 0.3-0.8%. 25. The capsule of claim 15, wherein said capsule and said formulation arc stable for at least 18 months. 26. The capsule of claim 25, wherein said capsule and said formulation are stable for at least 1S months when stored at 25°C and 60% relative humidity. 27. The capsule of claim 25, wherein said capsule and said formulation are stable for at least 18 months when stored at 30°C and 65% relative humidity. 28. The capsule of claim 15, wherein said capsule and said formulation are stable for at least 12 months when stored at 40"C and 75% relative humidity. 29. The capsule of any of claims 25-28, wherein the stability of said capsule and said formulation is determined by dissolution analysis. 30. Use of a capsule as defined in any one of claims 1 to 14 in the manufacture of a medicament for treating a fihrotic condition or for inllibitory action of , cytokines in a patient suffering from a disorder mediated by cytokines. .

Full Text

CAPSULE FORMULATION OF PIRFENIDONE AND PHARMACEUTICALLY ACCEPTABLE EXCIPDENTS
BACKGROUND OF THE DISCLOSURE
FIELD OF THE DISCLOSURE
[0001] The present disclosure relates in general to pirfenidone, a small drug molecule whose chemical name is 5-methyl-l-phenyl-2-(lH)-pyridone. Specifically, the present disclosure relates to a capsule formulation of pirfenidone including pharmaceutically acceptable excipients. Further provided are methods of using such capsule formulation in the treatment of fibrotic conditions and other disorders mediated by cytokines.
DESCRIPTION OF THE RELATED ART
[0002] Pirfenidone is a non-peptide synthetic molecule with a molecular weight of 185.23 daltons. Its chemical elements are expressed as C^HnNO, and its structure is known. The synthesis of pirfenidone has been worked out. Pirfenidone is manufactured and being evaluated clinically as a broad-spectrum anti-fibrotic drug. Pirfenidone has anti-fibrotic properties via: decreased TNF-a expression, decreased PDGF expression, and decreased collagen expression. Several pirfenidone Investigational New Drug Applications (INDs) are currently on file with the U.S. Food and Drug Administration. Phase II human investigations are ongoing or have recently been completed for pulmonary fibrosis, renal glomerulosclerosis, and liver cirrhosis. There have been other Phase n studies that used pirfenidone to treat benign prostate hypertrophy, hypertrophic scarring (keloids), and rheumatoid arthritis.
[0003] One important use of pirfenidone is known to be providing therapeutic benefits to patients suffering from fibrosis conditions such as Hermansky-Pudlak Syndrome (HPS) associated pulmonary fibrosis and idiopathic pulmonary fibrosis (IPF). Pirfenidone demonstrates a pharrnacologic ability to prevent or remove excessive scar
tissue found in fibrosis associated with injured tissues including that of lungs, skin, joints, kidneys, prostate glands, and livers. Published and unpublished basic and clinical research suggests that pirfenidone may safely slow or inhibit the progressive enlargement of fibrotic lesions, remove pre-existing fibrotic lesions, and prevent formation of new fibrotic lesions following tissue injuries.
[0004] It is understood that one mechanism by which pirfenidone exerts its therapeutic effects is modulating cytokine actions. Pirfenidone is a potent inhibitor of fibrogenic cytokines and TNF-a. It is well documented that pirfenidone inhibits excessive biosynthesis or release of various fibrogenic cytokines such as TGF-fil, bFGF, PDGF, and EOF. Zhang S et al., Australian and New England Journal Ophthalmology, 26; S74-S76, 1998. Experimental reports also show that pirfenidone blocks the synthesis and release of excessive amounts of TNF-a from macrophages and other cells. Cain et al., International Journal Immunopharmacology, 20:685-695 (1998). [0005] As an investigational drug, pirfenidone is provided in tablet and capsule forms principally for oral administration. Various formulations have been tested and adopted in clinical trials and other research and experiments. The effectiveness of a formulation may be determined by a plurality of factors, including the amount of pirfenidone it contains, the kinds and relative amounts of pharmacologically acceptable excipients used, and the target patient profile (e.g., the physiological and genetic conditions, disease prognosis, and demographic characteristics of the patient). Changes in these factors cause changes in pharmacokinetic (PK) responses in the patient. Thus, there is a need in general for effective pharmaceutical formulations that elicit desirable pharmacokinetic responses in patients thereby optimizing therapeutic actions of pirfenidone.
SUMMARY OF THE VARIOUS EMBODIMENTS
[0006] It is therefore an object of this disclosure to provide pharmaceutical formulations of pirfenidone capable of advantageous therapeutic actions. It is a related object to provide pharmaceutical formulations of pirfenidone capable of eliciting and sustaining desirable pharmacokinetic responses in the patient hi need thereof. It is
another object of this disclosure to provide methods for treating fibrotic conditions and other cytokine-mediated disorders using such formulations.
[0007] Li accordance with this disclosure, there is provided, in one embodiment, a capsule having a pharmaceutical formulation of 5-methyl-l-phenyl-2-(lH)-pyridone (pirfenidone), which includes 5-30% of pharmaceuticaHy acceptable excipients and 70-95% of pirfenidone by weight.
[0008] According to another embodiment, the excipients include disintegrators, binders, fillers, and lubricants. Examples of disintegrators include agar-agar, algins, calcium carbonate, carboxmethylcellulose, cellulose, clays, colloid silicon dioxide, croscarmellose sodium, crospovidone, gums, magnesium aluminium silicate, methylcellulose, polacrilin potassium, sodium alginate, low substituted hydroxypropylcellulose, and cross-linked polyvinylpyrrolidone hydroxypropylcellulose, sodium starch glycolate, and starch. Examples of binders include microcrystalline cellulose, hydroxymethyl cellulose, hydroxypropylcellulose, and polyvinylpyrrolidone. Examples of fillers include calcium carbonate, calcium phosphate, dibasic calcium phosphate, tribasic calcium sulfate, calcium carboxymethylcellulose, cellulose, dextrin derivatives, dextrin, dextrose, fructose, lactitol, lactose, magnesium carbonate, magnesium oxide, maltitol, maltodextrins, maltose, sorbitol, starch, sucrose, sugar, and xylitol. Examples of lubricants include agar, calcium stearate, ethyl oleate, ethyl laureate, glycerin, glyceryl palmitostearate, hydrogenated vegetable oil, magnesium oxide, magnesium stearate, mannitol, poloxamer, glycols, sodium benzoate, sodium lauryl sulfate, sodium stearyl, sorbitol, stearic acid, talc, and zinc stearate. [0009] According to yet another embodiment, by weight 2-10% of the capsule is disintegrator, 2-30% is binder, 2-30% is filler, and 0.3-0.8% is lubricant. In another embodiment, by weight 2-10% of the capsule is disintegrator, 2-25% is binder, 2-25% is filler, and 0.3-0.8% is lubricant. According to still another embodiment, the excipients further include povidone. In a further embodiment, by weight 1-4% of the capsule is povidone. According to another embodiment, the capsule includes 100-400 mg Pirfenidone.
[0010] In accordance with mis disclosure, there is provided, in another embodiment, a method for treating a fibrotic condition. The method comprises
administering the aforementioned capsule to a patient suffering from the fibrotic condition. Examples of such fibrotic conditions include pulmonary fibrosis, hepatic fibrosis, cardiac fibrosis, keloid, dermal fibrosis, coronary restenosis, and post-surgical adhesions. Examples of pulmonary fibrosis include idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndromes.
[0011] In accordance with this disclosure, there is provided, in yet another
embodiment, a method for inhibiting actions of cytokines in a patient suffering from a
disorder mediated by such cytokines. The method comprises administering the
aforementioned capsule to the patient. Examples of such cytokines include TNF-a, TGF-
131, bFGF, PDGF, and EOF. Examples of such disorder include multiple sclerosis,
arthritis, asthma, chronic rhinitis, and edema. In still another embodiment, the method
further comprises administering one or more capsules to the patient one or more times a
day, with a total daily intake of pirfenidone greater than 1200 mg. In various
embodiments, the patient is given one or more capsules twice or three times a day.
[0012] In accordance with this disclosure, there is provided, in still another
embodiment, a capsule having an effective amount of pirfenidone and pharmaceutically acceptable excipients. The capsule when administered in a patient is capable of sustaining a measurable pharmacokinetic response. The pharmacokinetic response is characterized by a one or more fold increase in the Tmax or AUC values than a pirfenidone capsule containing no pharmaceutically acceptable excipients. In various embodiments, treatment methods of administering such capsules are provided for patients suffering from fibrotic conditions such as idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndrome, and other disorders mediated by cytokines such as TNF-a, TGF-fll, bFGF, PDGF, and EOF.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 shows changes in the mean serum concentrations of pirfenidone
and its metabolite 5-carboxylic acid over time in human subjects included in one of the
previously reported pharmacokinetic studies: Shionogi Phase II.
[0014] Figure 2 is a table that shows quantitative compositions of the pirfenidone
tablets used in Shionogi Phase II.
[0015] Figure 3 shows changes in pirfenidone serum concentrations over time in
human subjects after a single dose of 400 mg pirfenidone delivered orally in capsules
without excipients.
[0016] Figure 4 shows changes in pirfenidone serum concentrations over time in
human objects following a single dose of 200-300 mg pirfenidone delivered orally in
capsules with excipients, according to one embodiment of this disclosure.
[0017] Figure 5 is a table that shows the PK values of the capsules with excipients
according to one embodiment of this disclosure, compared to the PK values of capsules
without excipients that were used in Schmidt 1974, one of the previously reported PK
studies.
[0018] Figure 6 is a table that shows the formulation of pirfenidone/excipient-
containing capsules used in the study depicted in Figure 4 and the study depicted in
Figure 8a-c.
[0019] Figure 7 is a table that lists the components used to prepare a representative
batch of the pirfenidone/excipient formulation of Figure 6.
[0020] Figures 8a-c lists tables that show the stability of the pirfenidone/excipient
formulation of Figure 6 at 25°C and 60% relative humidity (Figure 8a), 35°C and 65%
relative humidity (Figure 8b), and 40°C and 75% relative humidity (Figure 8c).
[0021] Figures 9a and 9b depict additional representative formulation of
pirfenidone/excipient-containing capsules contemplated herein.
DETAILED DESCRIPTION OF THE VARIOUS EMBODIMENTS Discussion Of The Relevant Terms
[0022] Throughout the present disclosure relevant terms are to be understood consistently with their typical meanings established in the relevant art, i.e. the art of pharmaceutical chemistry, medicine, biology, genetics, molecular biology, biochemistry, physiology, genomics, pharmacogenomics, bioinformatics, computational biology, and cheminfomatics. However, further clarifications and descriptions are provided for certain terms as set forth below:
[0023] The terms pharmaceuticals, pharmaceutical products, drug products, drug
chemicals, drug compounds, compounds, and chemicals, are used interchangeably
throughout this disclosure.
[0024] API, as used herein, refers to active pharmaceutical ingredients. In various
embodiments of this disclosure, the API of the capsule and tablet formulations is
pirfenidone.
[0025] The terms pharmaceutically acceptable excipients, pharmaceutically
compatible excipients, and excipients are used interchangeably in this disclosure. They
refer to non-API substances such as disintegrators, binders, fillers, and lubricants used in
formulating pharmaceutical products. They are generally safe for administering to
humans according to established governmental standards, including those promulgated by
the United States Food and Drug Administration.
[0026] Disintegrators, as used herein, refer to one or more of agar-agar, algins,
calcium carbonate, carboxmethylcellulose, cellulose, clays, colloid silicon dioxide,
croscarmellose sodium, crospovidone, gums, magnesium aluminium silicate,
methylcellulose, polacrilin potassium, sodium alginate, low substituted
hydroxypropylcellulose, and cross-linked polyvinylpyrroh'done hydroxypropylcellulose,
sodium starch glycolate, and starch.
[0027] Binders, as used herein, refer to one or more of microcrystalline cellulose,
hydroxymethyl cellulose, hydroxypropylcellulose, and polyvinylpyrrolidone.
[0028] Fillers, as used herein, refer to one or more of calcium carbonate, calcium
phosphate, dibasic calcium phosphate, tribasic calcium sulfate, calcium
carboxymethylcellulose, cellulose, dextrin derivatives, dextrin, dextrose, fructose,
lactitol, lactose, magnesium carbonate, magnesium oxide, maltitol, maltodextrins,
maltose, sorbitol, starch, sucrose, sugar, and xylitol.
[0029] Lubricants, as used herein, refer to one or more of agar, calcium stearate,
ethyl oleate, ethyl laureate, glycerin, glyceryl palmitostearate, hydrogenated vegetable
oil, magnesium oxide, magnesium stearate, mannitol, poloxamer, glycols, sodium
benzoate, sodium lauryl sulfate, sodium stearyl, sorbitol, stearic acid, talc, and zinc
stearate.
[0030] Capsule, as used herein, refers to a generally safe, readily dissolvable
enclosure for carrying certain pharmaceutical products. In one embodiment, capsule is
made of gelatin. Other suitable matrix substances such as total synthetic polymer
chemicals having gelatin-like properties may be used to manufacture pirfenidone
capsules according to alternative embodiments of this disclosure.
[0031] AUC, as used herein, refers to the area under the curve that represents
changes in blood concentrations of pirfenidone over time.
[0032] CmaX5 as used herein, refers to the maximum value of blood concentration
shown on the curve that represents changes in blood concentrations of pirfenidone over
time.
[0033] Tmax, as used herein, refers to the time that it takes for pirfenidone blood
concentration to reach the maximum value.
[0034] Ti/2, as used in this disclosure, refers to the time that it takes for pirfenidone
blood concentration to decline to one-half of the maximum level.
[0035] Collectively AUC, Cmax, T^ax, and Ti/2 are the principle pharmacokinetic
parameters that characterize the pharmacokinetic responses of a particular drug product
such as pirfenidone in an animal or human subject.
Reported Pharmacokinetic Studies On Pirfenidone
[0036] Several pharmacokinetic studies on human subjects have been reported,
including one in healthy adult males (Schmidt RM, Ritter A and Margolin S, 1974 Unavailability of Pirfenidone Capsules Following Oral Administration (Human Volunteers) (60-244-73), October 11,1974. Affiliated Medical Research, Inc., Princeton, New Jersey, hereafter "Schmidt 1974"), and two in patients with pulmonary fibrosis (Nagai S, Hamada K, Shigematsu M, Taniyama M, Yamauchi S and Izumi T, 2002, Open Label Compassionate Use One Year-Treatment with Pirfenidone to Patients with Chronic Pulmonary Fibrosis, Intern Med 41: 1118-1123, hereafter "Nagai 2002"; and AzumaA, Nukiwa T, Tsuboi E et al, 2005, Double-Blind, Placebo Controlled Trial of Pirfenidone in Patients with Idiopathic Pulmonary Fibrosis, Am J Respir Crit Care Med., hereafter "Shionogi Phase II").
[0037] Schmidt 1974 examined the pharmacoldneti.es of single dose pirfenidone. Pirfenidone was administered orally to 10 healthy adult males at doses of 100,200, and 400 mg. On day 1, a single dose of 100 nag was given to each subject. On day 3, a single dose of 200 mg was given to each subject. And on day 4, a last single dose of 400 mg was given to each subject. This last single dose of 400 mg was analyzed for pharmacokinetics. Blood plasma samples were collected before dosing and at 0.25, 1,4, and 6 hr after dosing. Pirfenidone concentrations in plasma were determined by gas chromatography. The resulting values of pharmacokinetic parameters are: Cmax = 6.3 + 2.5 ug/mL, Tmax = 0.9 ± 0.3 hrs, AUC6hr = 20.8 + 10.0 ug/mL-hr, andTi/a = 2.2 ± 0.6 hrs. [0038] Nagai 2002 involved 10 male patients with pulmonary fibrosis. The subjects underwent dose escalation starting with an initial dose of 400 mg for several days to a maintenance dose of 40 mg/kg/day. Pharmacokinetics analyses were done on each of the 10 subjects on day 1 when a dose of 400 mg was given. Plasma samples were collected at 0, 0.25,1,1.5,2,4, 6, 8, and 24 hr after dosing. The values of pharmacokinetic parameters were computed. Cmax was 3.0 to 7.2 ug/mL, and AUC24hr
I
was 16.9 to 66.4 ng/mL-hr.
[0039] • Shionogi Phase II involved serial sampling in a 15-patient subset of a pirfenidone cohort (13 males and 2 females). On day 1 a 200 mg single dose was given to each of the 15 patients, and serum samples were collected before dosing and at 0.5,1, 2, and 3 hr after dosing. Blood concentrations of pirfenidone were determined by HPLC assay. Figure 1 demonstrates changes in the observed mean serum concentrations of pirfenidone and its metabolite 5-carboxylic acid over time. The values of pharmacokinetic parameters were computed to be: Cmax = 2.7 + 0.7 pg/mL, Tmax = 1.8 + 1.1 hrs, AUC4hr = 7.3 ± 1.6 |ag/mL-hr, and Tia = 3.5 ±2.2 hrs. [0040] The drug formulations in these previously reported studies were different. Schmidt 1974 used a capsule including 100% pirfenidone. Nagai 2002 and Shionogi Phase II used pirfenidone tablets that included certain pharmaceutically acceptable excipients For example, the drug product used in Shionogi Phase II was formulated as compressed, coated tablets of 200 mg of pirfenidone. Shionogi Phase II tablets included pharmaceutically acceptable excipients. Figure 2 is a table listing the ingredients of the Shionogi Phase II tablets and the quantities of each ingredient. As shown, the core tablet
was 285 mg, of which 200 mg was API Various amounts of disintegrator, filler, binder, and lubricant were included. With the addition of the coating, the total weight of the Shionogi Phase II tablet was 296.4 mg.
[0041] One additional pharmacokinetic study was conducted on a single dose of four 100 mg capsules each containing 100% pirfenidone. Ten human volunteers were included in this study. At 15 minutes after oral ingestion of 400 mg pirfenidone, the
jUct •'•'-•
average serum concentration of pirfenidone reached 3.97 aaig/mL. At one hour, the
average serum concentration was measured to be 5.57 aig/mL, and at six hour 1.63 Hag/inL. Figure 3 is a plot of serum pirfenidone levels over time summarizing this study. As shown, the maximum serum pirfenidone level was reached between one and three hours. The value of 1\n was calculated to be 2.87 + 0.22 hrs.
Capsule Formulation Of Pirfenidone With Excipients
[0042] To those skilled in the pharmaceutical research and manufacturing, it is generally known that tablet formulations permit generous additions of non-API ingredients including excipients and coating substances, especially high percentage of fillers. However, the addition of non-API ingredients may limit the amount of API carried in each tablet. By contrast, capsule formulations tend to facilitate the inclusion of high percentage of API with no or less non-API components. Capsules may allow for inclusion of a larger amount of binders, instead of fillers as used more hi tablets. Where high percentage of API is desired and specific excipients are not known to be essential, capsule formulations are often adopted.
[0043] To be sure, no capsule formulation of pirfenidone manufactured or reported to date contains excipients. The present disclosure provides a new pirfenidone capsule formulation with certain pharmaceutically acceptable excipients. According to one embodiment, this new capsule formulation is capable of eliciting advantageous pharmacokinetic responses in human subjects, hi another embodiment, this new capsule formulation facilitates dissolution and improves flowability in the capsule manufacturing process.
[0044] This capsule formulation includes 100-400 mg pirfenidone. One or more pharmaceutically acceptable excipients are added in various embodiments. For example, in one embodiment, by weight 2-10% of the capsule is disintegrator, 2-30% is binder, 2-30% is filler, and 0.3-0.8% is lubricant. As described in the beginning of this Detailed Description, a multitude of substances maybe suitably included as disintegrator, binder, filler, and lubricant. One example is to use magnesium stearate as lubricant, microcrystalline cellulose as binder, and croscannellose as disintegrator. In a particular embodiment, the capsule formulation further includes povidone. By weight povidone may constitute 1-4% of the capsule.
[0045] The capsule shell may be made of hard gelatin in one embodiment. The shell may be clear or opaque, white or with color in various embodiments. The capsule is size 1 in a preferred embodiment. Other sizes may be adopted in alternative embodiments.
[0046] The manufacture of pirfenidone capsules based on the capsule formulation of the various embodiments includes a series of steps. These steps are: preparing pirfenidone granulation, fluid bed drying, milling, lubrication blend, encapsulation, and bulk packaging
[0047] The preparation of pirfenidone granulation may be done in the following sequence. First, povidone is mixed with water and dissolved using an overhead mixer. Second, pirfenidone is milled with croscannellose and microcrystalline cellulose to break up any lumps. Third, the milled pirfenidone, croscannellose, and microcrystalline cellulose are added into a high sheer granulate and blended. Fourth, the povidone and water solution is added to the blend. Fifth, the pirfenidone granulation is blended for an additional period of time after the povidone and water solution have been completely added.
[0048] The fluid bed drying process may be preformed on a Fluid Bed Dryer with an inlet temperature of 60°C. The milling process may be preformed using a suitable miller such as Quadro Comil®. The lubrication blend process may be conducted with the addition of an appropriate amount of croscannellose and magnesium stearate. The pirfenidone granulation may be further blended at this point. Next, the pirfenidone granulation is encapsulated using a suitable encapsulator into two-piece, size 1, gelatin
capsules to yield a desired pirfenidone dose of 100-400 mg. The dose of 200-300 mg is yielded in a preferred embodiment. To conclude the capsule manufacturing process, finished capsules may be packaged in secured, double polybags and stored at controlled room temperature. Those skilled in drug research and drug making will appreciate that certain of the aforementioned steps maybe modified or omitted, and additional steps may be included, without materially alter the outcome of the manufacturing. [0049] An exemplary composition of the pirfenidone/excipient formulation-containing capsules that was prepared and tested is provided in Figure 6. A representative batch of the pirfenidone/excipient formulation was prepared using routine wet formulation methods to combine the components listed in Figure 7. [0050] Pharmacokinetic studies were performed on the pirfenidone capsules of the present disclosure. A first study depicted in Figure 4 shows average changes in serum concentrations over time in four groups of subjects to whom were administered a single dose of the 267 mg pirfenidone capsule formulation of Figure 6. The four lines of this graph, A, B, C and D, represent four different groups of subjects: A, fasted subjects; B 1 fasted subjects with anatacid administered; C fed subjects; and D fed subjects with anatacid administered.
[0051] In another pharmacokinetic study, two groups of human subjects on normal diet were included, each having 13 subjects. One group (Group I) received no antacid, while the other group (Group II) received antacid. The 267 mg pirfenidone capsule formulation of Figure 6 was given to each subject. Figure 5 is a table summarizing the resulting PK values for both groups (Capsule Groups I and IT), compared to the PK values reported in Schmidt 1974. As demonstrated in Figure 5, Tmax is significantly longer (an approximately two-fold increase in each of Groups I and II) for these excipient-containing capsules than what was reported in Schmidt 1974. AUC is also significantly higher (increased by about two-fold in each of Groups I and II) for these excipient-containing capsules than what was reported hi Schmidt 1974. AUC values are computed over a time period of zero to infinity. The values of Cmax. and Ti/2 are also higher than or comparable with those reported in Schmidt.
[0052] These resulting PK values, especially the increased Tmax and AUC, indicate a prolonged absorption phase for the pirfenidone capsules with excipients according to
the present disclosure. Consequently, these capsules are capable of sustaining prolonged therapeutic actions in a patient. Therefore, compared to the capsules without excipients, as what were used in Schmidt 1974, the capsule formulation with the excipients may be advantageously administered to a patient in need, thereby eliciting desirable pharmacokinetic responses in the patient. Whilst such desirable PK responses are surprising results, it is conceivable that binders such as microcrystalline cellulose or povidone favorably interact with the amide carbonyl group of pirfenidone forming a transient complex which may then dissociate, resulting in a slow build-up in the plasma concentration of pirfenidone, or a slow decline or clearance in the plasma concentration. [0053] Based on the longer Tmax and 1\n, a simplified dosing regimen, e.g., changing from three times a day to twice a day, may be implemented, which is likely to result in greater patient compliance. In addition, higher Cmax values suggest that daily dosages may be reduced without altering the therapeutic effects of pirfenidone. A reduced daily dosage may lead to reduction or elimination of toxicity and other adverse effects of the drug.
[0054] In addition to the therapeutic advantages of the pirfenidone/excipient formulations provided herein, these capsules and the formulations also show good stability under various storage conditions over time. In some embodiments, under various storage conditions the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. For example, under storage conditions of 25°C and 60% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. In another example, under storage conditions of 30°C and 65% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, 36 months, or 48 months. In another example, under storage conditions of 40°C and 75% relative humidity, the capsules and pirfenidone/excipient formulations provided herein can be stable for at least, or at least about, 3 months, 6 months, 9 months, or 12 months.
[0055] la some embodiments, the stability of the capsules and pirfenidone/excipient formulations provided herein is determined by measuring the dissolution rate of the stored capsule and/or pirfenidone/excipient formulations. Any of a variety of dissolution methods provided herein or otherwise known in the art can be performed to determine the stability of capsules and pirfenidone/excipient formulations. Dissolution measurements are in vitro methods known in the art to be representative of in vivo Tmax and AUC values. Accordingly, the stability of the capsules and pirfenidone/excipient formulations as measured by dissolution methods will be representative of the in vivo Tmax and AUC values of a subject when the capsules and pirfenidone/excipient formulations after storage, for example, under the above-exemplified conditions for the indicated amount of time. Typically, a dissolution level indicative of an acceptable level of stability is a dissolution of at least, or at least about 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or more, of the pirfenidone in the capsules provided herein. Any of a variety of dissolution methods provided herein or otherwise known in the art can be performed to determine the stability of capsules and pirfenidone/excipient formulations. For example, dissolution can be determined according to the pharmacopoeial dissolution method specified in USP29.
[0056] The stability of the capsules and pirfenidone/excipient formulations provided herein is demonstrated in the results presented in Figure 8. The 267 mg pirfenidone capsule formulation of Figure 6 was stored for 18 months under three different storage conditions: 25°C and 60% relative humidity, 30°C and 65% relative humidity, and 40°C and 75% relative humidity. Figure 8 shows that the dissolution of the capsule and pirfenidone/excipient formuations at 25°C and 60% relative humidity, 30°C and 65% relative humidity did not appreciably change over the duration of the 18 month period. The dissolution of the capsule and pirfenidone/excipient formuations at 40°C and 75% relative humidity did not appreciably change over the initial 12 month period. The dissolution analysis was performed according to the pharmacopoeial dissolution method specified in USP29 using Apparatus 2 (paddles) with water as a solvent and a specification of Q=70% of label claim in 30 minutes. Also shown in Figure 8, the level of impurities in each formulation, as determined by HPLC, was less than 0.05% over the duration of the 18 month period, hi addition, Hie moisture content, as determined by the
Karl Fischer method, of all but one time point (40°C, 75% RH at 18 months) remained below 2%, and the moisture content of all samples remained below 2.5% over the duration of the 18 month period. Finally, the percent of pirfenidone in each sample, as determined by HPLC, showed no appreciable degradation over the 18 month period. [0057] hi addition to the specific formulation provided herein in Figure 6, further formulations contemplated herein are provided in Figure 9a and 9b.
Therapeutic Indications
[0058] One embodiment of this disclosure provides methods for treating fibrotic conditions and other cytokine-niediated disorders. These methods comprise administering the excipients-containing pirfenidone capsules of this disclosure to a patient suffering from a fibrotic condition or a cytokine-niediated disorder. The dosing may be twice or three times daily, with one or more capsules per intake. According to a particularly embodiment, the total daily intake is at least 1200 mg pirfenidone. The total daily intake amount may vary, depending on the patient profile, including among other things the patient's demographic characteristics, physiological and genetic conditions, and disease prognosis. For example, a child or a senior person may be given a lower amount daily than that given to an ordinary adult.
[0059] The anti-fibrotic activity of pirfenidone is demonstrated in in vivo animal fibrosis models, as well as-in vitro cell culture studies with human or animal lung fibroblasts, dermal fibroblasts, and fibroblast-like cells. Those data indicates that pirfenidone may be an effective agent for preventing and treating post-surgical adhesions, myocardial fibrosis, renal fibrosis, liver cirrhosis, atherosclerosis, and other fibrotic disorders. In vitro cell cultures with human mesenchymal-like cells (including lung fibroblasts, skin fibroblasts, prostate strornal cells, and renal mesangial cells, etc) have shown pharmacologic inhibition by pirfenidone of excessive cell proliferation induced by cytokine growth factors (TGF-M, bFGF, PDGF, and EOF), hi cell culture media, graded concentrations of pirfenidone were effective at levels which were ten to twenty times lower than those exerting any pharmacologically toxic effects on the cells. [0060] At the site of injury, otherwise normal resident cells (e.g., fibroblasts, pericytes,, mesangial cells, astrocytes, microglia, and oligodendrocytes) manufacture and
discharge high concentrations of growth factors into adjacent tissue spaces. These resident sources of pathologically high levels of growth factors are directly responsible for the persistently excessive levels of growth factors. They cause excessive and harmful formation of collagen or amyloid matrix as well as damage to adjacent cells, the associated organ dysfunction, and frequently, organ malformation. [0061] TGF-151 is a potent growth-related peptide whose effects may be observed at femtomolar concentrations. It appears to be ubiquitous, and is a bifunctional regulator of cell proliferation in vitro. It acts either as a mitogen or a growth inhibitor depending on tissue concentration and the state of cell confluence (LJ. Striker et al., Lab. Invest. 64:446-456,1991). In skin incisions, after attracting macrophages and fibroblasts, TGF-131 enhances extracellular matrix formation by increasing transcription of genes for collagen and fibronectin, decreasing secretion of proteases, increasing secretion of protease inhibitors, and increasing transcription of cellular receptors for matrix proteins. [0062] The anti-fibrotic activities of pirfenidone have been demonstrated in vivo in laboratory animals with fibrotic lesions, in vitro with human lung fibroblast (WI38) cell cultures, and observed through pilot open trials in patients with severe pulmonary fibrosis, benign prostate hypertrophy, or keloids. Pirfenidone may selectively arrest scar enlargement, and remodels or removes scar tissue or fibrosis. The dysfunction caused by fibrotic lesions may be ameliorated by the reduction or removal of the fibrotic lesion following pirfenidone treatment. Apparently organ and tissue function can be restored, even after the presence of fibrosis for several years. When given immediately after an insult, such as trauma, infection, or allergy, to a tissue, pirfenidone also may prevent formation of excessive scar tissue, or fibrotic lesions, and thus help retain normal function and appearance of the tissue.
[0063] Pirfenidone may cause removal of excessive collagenous fibrotic tissue by a phagocytic action of local fibroblasts. This has been observed by examination of histological sections of lung tissue under the light microscope from dogs, mice, rats, and hamsters with pulmonary fibrosis treated with pirfenidone, and also through the electron micrographs of histological sections of lung tissue taken from hamsters with experimentally-induced asbestosis that were treated with pirfenidone. No infiltration of inflammation-inducing neutrophils, PMN cells, monocytes, lymphocytes occurred.
[0064] The enhanced proliferation of WI38 fibroblasts upon in vitro exposure to PDGF or bFGF may be blocked by pirfenidone added to cell growth media. Pirfenidone may also inhibit the TGF-B1 induced rise in collagen output hi lung and dermal fibroblast cultures.
[0065] The human clinical findings after treatment with pirfenidone have been consistent with the anti-fibrotic effects observed hi the laboratory animals. Pilot open clinical trials with oral pirfenidone have been undertaken with patients afflicted with pulmonary asbestosis, bleomycin-induced pulmonary fibrosis, idiopathic pulmonary fibrosis, scleroderma with pulmonary fibrosis, and Hermansky-Pudlak Syndrome characterized by pulmonary fibrosis.
[0066] The clinical criteria for beneficial response during the first months on pirfenidone included reduction in incidence of coughs, reduction in supplemental oxygen requirements, increased exercise tolerance, reduced dyspnea during exercise, amelioration of cor pulmonale, resumption of normal daily tasks, body weight gain, and survival. During the early months, pulmonary function as gauged by chest x-ray, spirometry, or CO diffusion (DLCO) showed little, if any, change. However, after 4 to 6 months on pirfenidone, inhibition or blocking of further deterioration hi lung function was evidenced by pulmonary function tests, vital capacity (VC), in the diffusing capacity of the lung for carbon monoxide (DLCO). These overall observations compare favorably with those described by Van Barneveld et al. (Amer. Rev. Respr. Dis., vol. 135,48-51, 1987), during the spontaneous recovery by patients from bleomycin-induced pulmonary pneumonitis (early stage fibrosis).
[0067] Martinet et al. (NE Jour. Med., vol 317,202-209,1987) have described an exaggerated release of PDGF by alveolar macrophages hi patients with idiopathic pulmonary fibrosis. The in vitro demonstration of inhibition by pirfenidone of the mitogenesis and enhanced formation of collagen caused by growth factors (bFGF, PDGF, and TGF- 61) may partly explain the beneficial in vivo anti-fibrotic action of pirfenidone. [0068] hi an open pilot trial of pirfenidone in older men with clinically advanced benign prostate hypertrophy (BPH, non-cancerous fibrous enlargement of the male prostate gland), the patients experienced functional improvement based on objective criteria. After taking oral pirfenidone the frequent urinary bladder urgency was
ameliorated, and nocturia rarely recurred. In another pilot open trial, topical applications of pirfenidone ointment to surgical sites immediately after keloid resection has prevented recurrence of the keloids as observed in two-year follow-ups in the patients. Each of those patients had a prior history of repeated early keloid re-growths after such surgery. Pirfenidone may induce a remodeling of skin fibrotic lesions to reduce or remove keloids, reduce or remove dermal scars, and remove or lessen the contractures of hypertrophic (post burn injury) scars. In a similar condition, pirfenidone also acts to inhibitpost-operative surgical adhesions.
[0069] Thus, clinical investigations under both controlled protocol designs and open label trials have demonstrated that pirfenidone exerts anti-fibrotic and cytoprotective actions. The observed side effects after oral administration were relatively mild (drowsiness, gastric nausea or photosensitivity rash). No serious adverse reactions have been reported.
[0070] In summary, based on the TNF-a inhibitor (cytoprotective) activity of pirfenidone, the capsule formulation of the present disclosure maybe administered according to certain embodiments of this disclosure to treat patients suffering from the following disorders:
[0071] 1) Central Nervous System syndromes: relapsing-remitting multiple
sclerosis, primary and secondary multiple sclerosis, spinal multiple sclerosis, cerebral malaria, viral or bacterial infections of the CNS, bacterial meningitis, "autoimmune" disorders of the central nervous system (CNS), CNS stroke and infarction, brain edema, Parkinson's syndrome, Alzheimer's disease, amylotrophic lateral sclerosis (ALS), and brain concussion or contusion;
[0072] 2) Musculo-skeletal syndromes: rheumatoid arthritis, trauma-induced arthritis, arthritis caused by a microbial infection, or by a parasite, tendonitis, and, arthritis induced by medical products or drugs (including small synthetic molecules as well as purified natural or synthesized peptides or proteins);
[0073] 3) Pulmonary syndromes: acute adult respiratory distress syndrome, asthma, allergic rhinitis, allergic conjunctivitis, chronic obstructive pulmonary disease (COPD), and lung sarcoidosis;
[0074] 4) Systemic immunologic, inflammatory or toxic syndromes: endotoxemia shock syndrome, septic shock, graft-host disease, allograft vasculopathy, hemorrhagic shock, reperfusion injury of the brain or myocardium, thermal bums, radiation injury, general or dermal traumatic or contusion injuries, eosinophilic granuloma, diabetic mellitus (type II), or systemic lupus erythromatosus;
[0075] 5) Gastro-intestinal syndromes: Crohn's disease, ulcerative colitis, and liver inflammatory disorders; and [0076] 6) Congestive heart failure.
[0077] Further, based on the anti-fibrotic activity of pirfenidone, the capsule formulation of the present disclosure may be administered according to other embodiments to treat patients suffering from the following disorders: pulmonary fibrosis, radiation and drug-induced lung fibrosis, hepatic fibrosis, cardiac fibrosis, .keloid, post-surgical adhesions, benign prostate hypertrophy in humans, arteriosclerosis, dermal fibrosis, and coronary restenosis.
[0078] It is to be understood that the description, specific examples and data, while indicating exemplary embodiments, are given by way of illustration and are not intended to limit the various embodiments of the present disclosure. All references cited herein for any reason, are specifically and entirely incorporated by reference. Various changes and modifications within the present disclosure will become apparent to the skilled artisan from the description and data contained herein, and thus are considered part of the various embodiments of this disclosure.

WHAT IS CLAIMKD IS:
1. A capsule comprising a pharmaceutical formulation of 5-methyl-l -phenyl-
2-(lH)-pyridone, wherein said pharmaceutical formulation comprises, by weight, 5-30%
of pharmaceutical ly acceptable excipients and 70-95% of 5-methyl-l-phenyl-2-(lH>-
pyridone.
2. The capsule of claim 1, wherein said excipients comprise one or more
disintegrators, binders, fillers, and lubricants.
3. The capsule of claim 2, wherein said disintegrators comprise one or more
of agar-agar. algins, calcium carbonate, carboxraethylcellulose, cellulose, clays, colloid
silicon dioxide, croscarmellose sodium, crospovidone, gums, magnesium aluminium
silicate, mcthylcellulose, polacrilin potassium, sodium alginatc, low substituted
hydroxypropylcellulosc, and cross-linked polyvinylpyrrolidone hydroxypropylcellulosc,
sodium starch glycolate, and starch.
4. The capsule of claim 2, wherein said binders comprise one or more of
microciystallme cellulose, hydroxymcthyl cellulose, hydroxypropylcellulose, and
polyvinylpyrrolidone.
5. The capsule of claim 2. wherein said fillers comprise one or more of
calcium carbonate, calcium phosphate, dibasic calcium phosphate, tribasic calcium
sulfate, calcium carboxymethylcellulose, cellulose, dextrates, dextrin, dextrose, fructose. lactitol, lactose, magnesium carbonate, magnesium oxide, maiitol, maltodextrins, maltose, sorbitol. starch, sncrn.se, sugar, and xylitol.
6. The capsule of claim 2, wherein said lubricants comprise one or more of
agar, calcium stearate, ethyl olcatc, ethyl laureate, glycerin, gjyceryl palmitostcarate,
hydrogenated vegetable oil, magnesium oxide, magnesium stearate, mannitol, poloxamer,
giycols, sodium ben/oatc, sodium lauryl sulfale, sodium stearyl, sorbitol, stearic acid,
talc, and zinc stearnte.
7. The capsule of claim 2, wherein by weight said disintegrator is 2-10%,
said binder is 2-30%, said filler is 2-30%, and said lubricant is 0,3-0.8%.
8. The capsule of claim 2, wherein said excipients further comprise
povidone.
9. The capsxile of claim 8, wherein by weight said povidone is 1 -4%.
10. The capsule of claim 9, wherein the capsule comprises 100-400 mg 5-
methyl-1 -phenyl-2-( 1 H)-pyridonc.
11. A capsule comprising an effective amount of 5-methyl--1 -phenyl-2-( IH)-
pyridone and pharmaceutically acceptable excipients. wherein said capsule is capable of
sustaining a measurable phannacokinetic response in a patient, wherein said
pharmacokinetic response is characterized by a one or more fold increase in the T,,m
values compared to a capsule of 5-methyl- l-phenyl-2-(lH)-pyridone containing no
phannaceutically acceptable excipients.
12. A capsule comprising an effective amount of 5-methyl-1 -phenyl-2-( 1H)-
pyridone and pharmaceutically acceptable excipients, wherein said capsule is capable of
sustaining a measurable phannacokinetic response in a patient, wherein said
pharmacokinetic response is characterized by a one or more fold increase in the ADC
values compared to a capsule of 5-methyl- l-phenyl-2-(lH)-pyridone containing no
phannaceutically acceptable excipients.
13. The capsule of claim 11 or 12, wherein the excipients comprise one or
more disintegrators, binders, fillers, and lubricants.
14. The capsule of claim 12, wherein the excipients further comprise
povidone.
15. A capsule for treating a fibrotic condition, wherein the capsule is as
defined in any one of claims 1, 11, or 12.
16. The capsule of claim 15, wherein said fibrotic condition is one of
pulmonary fibrosis, hepatic fibrosis, cardiac fibrosis, keloid, derma! fibrosis, coronary
rcstenosis, and post-surgical adhesions.
17. The capsule of claim 1 (>, wherein said pulmonary fibrosis is one of
idiopathic pulmonary fibrosis and Hermansky-Pudlak Syndrome.
18. A capsule for inhibiting actions of cytokines in a patient suffering from a
disorder mediated thereby, wherein the capsule is as defined in any one of claims 1,11,
or 12.
19. The capsule of claim 18, wherein said cytokines comprise one or more of
TNF-o, TGF-/31, bFGF, PDGF, and EOF.
20. The capsule of claim 19, wherein said disorder is one of multiple sclerosis,
arthritis, asthma, chronic rhinitis, and edema.
21. The capsule of claim 15 or 18, wherein the capsule is for administering
one or more said capsules to said patient one or more times a day, wherein the total intake
of 5-methyl-l-phenyJ-2-(lH)-pyridone is at least 1200 mg a day.
22. The capsule of claim 21, wherein said one or more capsules are
administered to the patient twice a day.
23. The capsule of claim 22, wherein said one or more capsules are
administered to the patient three times a day.
24. The capsule of claim 15, wherein by weight said disintegrator is 2-10%,
said binder is 2-25%, said filler is 2-25%, and said lubricant is 0.3-0.8%.
25. The capsule of claim 15, wherein said capsule and said formulation arc
stable for at least 18 months.
26. The capsule of claim 25, wherein said capsule and said formulation are
stable for at least 1S months when stored at 25°C and 60% relative humidity.
27. The capsule of claim 25, wherein said capsule and said formulation are
stable for at least 18 months when stored at 30°C and 65% relative humidity.
28. The capsule of claim 15, wherein said capsule and said formulation are
stable for at least 12 months when stored at 40"C and 75% relative humidity.
29. The capsule of any of claims 25-28, wherein the stability of said capsule
and said formulation is determined by dissolution analysis.
30. Use of a capsule as defined in any one of claims 1 to 14 in the
manufacture of a medicament for treating a fihrotic condition or for inllibitory action of
, cytokines in a patient suffering from a disorder mediated by cytokines.
.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=5IvPLnFU0tSrc44KvGAg/Q==&loc=+mN2fYxnTC4l0fUd8W4CAA==

« Previous Patent

Next Patent »

Patent Number

269111

Indian Patent Application Number

2238/DELNP/2008

PG Journal Number

41/2015

Publication Date

09-Oct-2015

Grant Date

30-Sep-2015

Date of Filing

17-Mar-2008

Name of Patentee

INTERMUNE, INC.

Applicant Address

3280 BAYSHORE BOULEVARD, BRISBANE, CALIFORNIA 94005, U.S.A

Inventors:

#	Inventor's Name	Inventor's Address
1	KENNETH SULTZBAUGH	1341 TILTON ROAD, BRIDGE WATER, NEW JERSEY 08807, U.S.A
2	RAMACHANDRAN RADHAKRISHNAN	40623 PALATINO STREET, FREMONT, CALIFORNIA 94539, U.S.A
3	RONALD VLADYKA	15 NORFOLK ROAD, SOMERSET, NEW JERSEY 08873, U.S.A

PCT International Classification Number

A61K 9/48

PCT International Application Number

PCT/US2006/037057

PCT International Filing date

2006-09-22

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	60/720,257	2005-09-22	U.S.A.