post-title portfolio-title Enzalutamide soft capsules IP 40mg Taj Pharma 2020-03-06 09:58:41 no no

Enzalutamide soft capsules IP 40mg Taj Pharma

Enzalutamide soft capsules IP 40mg Taj Pharma

Overview

INTRODUCTION

Enzalutamide Capsule is used in the treatment of cancer of the prostate gland. It may be also used to treat other conditions, as determined by the doctor. It works by blocking the effects of male hormones such as testosterone.

Enzalutamide Capsule should be taken with or without food, preferably at a fixed time every day. Your doctor will decide what dose is necessary and how often you need to take it. This will depend on what you are being treated for and may change from time to time. You should take it exactly as your doctor has advised. Taking it in the wrong way or taking too much can cause very serious side effects. It may take several weeks or months for you to see or feel the benefits but do not stop taking it unless your doctor tells you to.

Headache, hot flashes, weakness and high blood pressure is very common side effect of this medicine. Other than this, yellowing of skin, loss of appetite, shortness of breath, abdominal pain, dark urine, and skin rashes might be observed as side effects. Regular blood tests are required to check your blood cells along with liver function during treatment with this medicine. It makes your skin more sensitive towards sunlight, hence take extra caution while going out.

Before taking it, tell your doctor if have diabetes, seizures, liver, or kidney problems or are taking any medicines to treat infections. Many other medicines can affect, or be affected by, this medicine so let your doctor know all medications you are using. This medicine is not recommended during pregnancy or while breastfeeding. The use of effective contraception by both males and females during treatment is important to avoid pregnancy. You may be asked for regular monitoring of blood glucose level while on treatment.

USES OF ENZALUTAMIDE CAPSULE

  • Prostate cancer

SIDE EFFECTS OF ENZALUTAMIDE CAPSULE

Common

  • Headache
  • Hot flashes
  • Weakness
  • High blood pressure
  • Fatigue

HOW TO USE ENZALUTAMIDE CAPSULE

Take this medicine in the dose and duration as advised by your doctor. Do not chew, crush or break it. Enzalutamide Capsule may be taken with or without food, but it is better to take it at a fixed time.

HOW ENZALUTAMIDE CAPSULE WORKS

Enzalutamide Capsule is an antiandrogens. It works by blocking the effect of the natural male hormones on the growth of prostate cells.

SAFETY ADVICE

warningsAlcohol

UNSAFE

It is unsafe to consume alcohol with Enzalutamide Capsule.

warningsPregnancy

CONSULT YOUR DOCTOR

Enzalutamide Capsule is unsafe to use during pregnancy as there is definite evidence of risk to the developing baby. However, the doctor may rarely prescribe it in some life-threatening situations if the benefits are more than the potential risks. Please consult your doctor.

warningsBreastfeeding

UNSAFE

Enzalutamide Capsule is unsafe to use during breastfeeding. Data suggests that the drug may cause toxicity to the baby.

warningsDriving

UNSAFE

Enzalutamide Capsule may cause side effects which could affect your ability to drive.

warningsKidney

CAUTION

Enzalutamide Capsule should be used with caution in patients with severe kidney disease. Dose adjustment of Enzalutamide Capsule may be needed. Please consult your doctor.

warningsLiver

CAUTION

Enzalutamide Capsule should be used with caution in patients with severe liver disease. Dose adjustment of Enzalutamide Capsule may be needed. Please consult your doctor.

WHAT IF YOU FORGET TO TAKE ENZALUTAMIDE CAPSULE?

If you miss a dose of Enzalutamide Capsule, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose.

Enzalutamide soft capsules IP 40mg Taj Pharma

1. NAME OF THE MEDICINAL PRODUCT

Enzalutamide soft capsules IP 40mg Taj Pharma

2.QUALITATIVE AND QUANTITATIVE COMPOSITION??????????????????????????????

Enzalutamide – 40 mg soft capsules

Each soft capsule contains 40 mg of
Enzalutamide IP??????? 40mg
sorbitol??????????????????? 57.8mg
Excipients???????????????? q.s.

For the full list of excipients, see section 6.1.

3.PHARMACEUTICAL FORM????

Soft capsule.

White to off-white oblong soft capsules (approximately 20 mm x 9 mm)

?4.CLINICAL PARTICULARS

4.1 Therapeutic indications

Enzalutamide is indicated for:

  • the treatment of adult men with high-risk non-metastatic castration-resistant prostate cancer (CRPC) (see section 5.1).
  • the treatment of adult men with metastatic CRPC who are asymptomatic or mildly symptomatic after failure of androgen deprivation therapy in whom chemotherapy is not yet clinically indicated (see section 5.1).
  • the treatment of adult men with metastatic CRPC whose disease has progressed on or after docetaxel therapy.

?4.2 Posology and method of administration

Treatment with enzalutamide should be initiated and supervised by specialist physicians experienced in the medical treatment of prostate cancer.

Posology

The recommended dose is 160 mg enzalutamide (four 40 mg soft capsules) as a single oral daily dose.

Medical castration with a luteinising hormone-releasing hormone (LHRH) analogue should be continued during treatment of patients not surgically castrated.

If a patient misses taking Enzalutamide at the usual time, the prescribed dose should be taken as close as possible to the usual time. If a patient misses a dose for a whole day, treatment should be resumed the following day with the usual daily dose.

If a patient experiences a ? Grade 3 toxicity or an intolerable adverse reaction, dosing should be withheld for one week or until symptoms improve to ? Grade 2, then resumed at the same or a reduced dose (120 mg or 80 mg) if warranted.

Concomitant use with strong CYP2C8 inhibitors

The concomitant use of strong CYP2C8 inhibitors should be avoided if possible. If patients must be co-administered a strong CYP2C8 inhibitor, the dose of enzalutamide should be reduced to 80 mg once daily. If co-administration of the strong CYP2C8 inhibitor is discontinued, the enzalutamide dose should be returned to the dose used prior to initiation of the strong CYP2C8 inhibitor (see section 4.5).

Elderly

No dose adjustment is necessary for elderly patients (see sections 5.1 and 5.2).

Hepatic impairment

No dose adjustment is necessary for patients with mild, moderate or severe hepatic impairment (Child-Pugh Class A, B or C, respectively). An increased half-life of enzalutamide has however been observed in patients with severe hepatic impairment (see sections 4.4 and 5.2).

Renal impairment

No dose adjustment is necessary for patients with mild or moderate renal impairment (see section 5.2).?Caution is advised in patients with severe renal impairment or end-stage renal disease (see section 4.4).

Paediatric population

There is no relevant use of enzalutamide in the paediatric population in the indication of treatment of adult men with CRPC.

Method of administration

Enzalutamide is for oral use. The soft capsules should not be chewed, dissolved or opened but should be swallowed whole with water, and can be taken with or without food.

?4.3 Contraindications

Hypersensitivity to the active substance(s) or to any of the excipients listed in section 6.1.

Women who are or may become pregnant (see sections 4.6 and 6.6).

?4.4 Special warnings and precautions for use

Risk of seizure

Use of enzalutamide has been associated with seizure (see section 4.8). The decision to continue treatment in patients who develop seizure should be taken case by case.

Posterior reversible encephalopathy syndrome

There have been rare reports of posterior reversible encephalopathy syndrome (PRES) in patients receiving Enzalutamide (see section 4.8). PRES is a rare, reversible, neurological disorder which can present with rapidly evolving symptoms including seizure, headache, confusion, blindness, and other visual and neurological disturbances, with or without associated hypertension. A diagnosis of PRES requires confirmation by brain imaging, preferably magnetic resonance imaging (MRI). Discontinuation of Enzalutamide in patients who develop PRES is recommended.

Concomitant use with other medicinal products

Enzalutamide is a potent enzyme inducer and may lead to loss of efficacy of many commonly used medicinal products (see examples in section 4.5). A review of concomitant medicinal products should therefore be conducted when initiating enzalutamide treatment. Concomitant use of enzalutamide with medicinal products that are sensitive substrates of many metabolising enzymes or transporters (see section 4.5) should generally be avoided if their therapeutic effect is of large importance to the patient, and if dose adjustments cannot easily be performed based on monitoring of efficacy or plasma concentrations.

Co-administration with warfarin and coumarin-like anticoagulants should be avoided. If Enzalutamide is co-administered with an anticoagulant metabolised by CYP2C9 (such as warfarin or acenocoumarol), additional International Normalised Ratio (INR) monitoring should be conducted (see section 4.5).

Renal impairment

Caution is required in patients with severe renal impairment as enzalutamide has not been studied in this patient population.

Severe hepatic impairment

An increased half-life of enzalutamide has been observed in patients with severe hepatic impairment, possibly related to increased tissue distribution. The clinical relevance of this observation remains unknown. A prolonged time to reach steady state concentrations is however anticipated, and the time to maximum pharmacological effect as well as time for onset and decline of enzyme induction (see section 4.5) may be increased.

Recent cardiovascular disease

The phase 3 studies excluded patients with recent myocardial infarction (in the past 6 months) or unstable angina (in the past 3 months), New York Heart Association Class (NYHA) III or IV heart failure except if Left Ventricular Ejection Fraction (LVEF) ? 45%, bradycardia or uncontrolled hypertension. This should be taken into account if Enzalutamide is prescribed in these patients.

Androgen deprivation therapy may prolong the QT interval

In patients with a history of or risk factors for QT prolongation and in patients receiving concomitant medicinal products that might prolong the QT interval (see section 4.5) physicians should assess the benefit risk ratio including the potential for Torsade de pointes prior to initiating Enzalutamide.

Use with chemotherapy

The safety and efficacy of concomitant use of Enzalutamide with cytotoxic chemotherapy has not been established. Co-administration of enzalutamide has no clinically relevant effect on the pharmacokinetics of intravenous docetaxel (see section 4.5); however, an increase in the occurrence of docetaxel-induced neutropenia cannot be excluded.

Excipients

Enzalutamide contains sorbitol (E420). Patients with rare hereditary problems of fructose intolerance should not take this medicinal product.

Hypersensitivity reactions

Hypersensitivity reactions manifested by symptoms including, but not limited to, rash, or face, tongue, lip, or pharyngeal oedema, have been observed with enzalutamide (see section 4.8).

?4.5 Interaction with other medicinal products and other forms of interaction

Potential for other medicinal products to affect enzalutamide exposures

CYP2C8 inhibitors

CYP2C8 plays an important role in the elimination of enzalutamide and in the formation of its active metabolite. Following oral administration of the strong CYP2C8 inhibitor gemfibrozil (600 mg twice daily) to healthy male subjects, the AUC of enzalutamide increased by 326% while Cmax?of enzalutamide decreased by 18%. For the sum of unbound enzalutamide plus the unbound active metabolite, the AUC increased by 77% while Cmax?decreased by 19%. Strong inhibitors (e.g. gemfibrozil) of CYP2C8 are to be avoided or used with caution during enzalutamide treatment. If patients must be co-administered a strong CYP2C8 inhibitor, the dose of enzalutamide should be reduced to 80 mg once daily (see section 4.2).

CYP3A4 inhibitors

CYP3A4 plays a minor role in the metabolism of enzalutamide. Following oral administration of the strong CYP3A4 inhibitor itraconazole (200 mg once daily) to healthy male subjects, the AUC of enzalutamide increased by 41% while Cmax?was unchanged. For the sum of unbound enzalutamide plus the unbound active metabolite, the AUC increased by 27% while Cmax?was again unchanged. No dose adjustment is necessary when Enzalutamide is co-administered with inhibitors of CYP3A4.

CYP2C8 and CYP3A4 inducers

Following oral administration of the moderate CYP2C8 and strong CYP3A4 inducer rifampin (600 mg once daily) to healthy male subjects, the AUC of enzalutamide plus the active metabolite decreased by 37% while Cmax?remained unchanged. No dose adjustment is necessary when Enzalutamide is co-administered with inducers of CYP2C8 or CYP3A4.

Potential for enzalutamide to affect exposures to other medicinal products

Enzyme induction

Enzalutamide is a potent enzyme inducer and increases the synthesis of many enzymes and transporters; therefore, interaction with many common medicinal products that are substrates of enzymes or transporters is expected. The reduction in plasma concentrations can be substantial, and lead to lost or reduced clinical effect. There is also a risk of increased formation of active metabolites. Enzymes that may be induced include CYP3A in the liver and gut, CYP2B6, CYP2C9, CYP2C19, and uridine 5′-diphospho-glucuronosyltransferase (UGTs – glucuronide conjugating enzymes). The transport protein P-gp may also be induced, and probably other transporters as well, e.g. multidrug resistance-associated protein 2 (MRP2), breast cancer resistance protein (BCRP) and the organic anion transporting polypeptide 1B1 (OATP1B1).

In vivo?studies have shown that enzalutamide is a strong inducer of CYP3A4 and a moderate inducer of CYP2C9 and CYP2C19. Co-administration of enzalutamide (160 mg once daily) with single oral doses of sensitive CYP substrates in prostate cancer patients resulted in an 86% decrease in the AUC of midazolam (CYP3A4 substrate), a 56% decrease in the AUC of S-warfarin (CYP2C9 substrate), and a 70% decrease in the AUC of omeprazole (CYP2C19 substrate). UGT1A1 may have been induced as well. In a clinical study in patients with metastatic CRPC, Enzalutamide (160 mg once daily) had no clinically relevant effect on the pharmacokinetics of intravenously administered docetaxel (75 mg/m2?by infusion every 3 weeks). The AUC of docetaxel decreased by 12% [geometric mean ratio (GMR) = 0.882 (90% CI: 0.767, 1.02)] while Cmax?decreased by 4% [GMR = 0.963 (90% CI: 0.834, 1.11)].

Interactions with certain medicinal products that are eliminated through metabolism or active transport are expected. If their therapeutic effect is of large importance to the patient, and dose adjustments are not easily performed based on monitoring of efficacy or plasma concentrations, these medicinal products are to be avoided or used with caution. The risk for liver injury after paracetamol administration is suspected to be higher in patients concomitantly treated with enzyme inducers.

Groups of medicinal products that can be affected include, but are not limited to:

  • Analgesics (e.g. fentanyl, tramadol)
  • Antibiotics (e.g. clarithromycin, doxycycline)
  • Anticancer agents (e.g. cabazitaxel)
  • Antiepileptics (e.g. carbamazepine, clonazepam, phenytoin, primidone, valproic acid)
  • Antipsychotics (e.g. haloperidol)
  • Antithrombotics (e.g. acenocoumarol, warfarin, clopidogrel)
  • Betablockers (e.g. bisoprolol, propranolol)
  • Calcium channel blockers (e.g. diltiazem, felodipine, nicardipine, nifedipine, verapamil)
  • Cardiac glycosides (e.g. digoxin)
  • Corticosteroids (e.g. dexamethasone, prednisolone)
  • HIV antivirals (e.g. indinavir, ritonavir)
  • Hypnotics (e.g. diazepam, midazolam, zolpidem)
  • Immunosuppressant (e.g. tacrolimus)
  • Proton pump inhibitor (e.g. omeprazole)
  • Statins metabolised by CYP3A4 (e.g. atorvastatin, simvastatin)
  • Thyroid agents (e.g. levothyroxine)

The full induction potential of enzalutamide may not occur until approximately 1 month after the start of treatment, when steady-state plasma concentrations of enzalutamide are reached, although some induction effects may be apparent earlier. Patients taking medicinal products that are substrates of CYP2B6, CYP3A4, CYP2C9, CYP2C19 or UGT1A1 should be evaluated for possible loss of pharmacological effects (or increase in effects in cases where active metabolites are formed) during the first month of enzalutamide treatment and dose adjustment should be considered as appropriate. In consideration of the long half-life of enzalutamide (5.8 days, see section 5.2), effects on enzymes may persist for one month or longer after stopping enzalutamide. A gradual dose reduction of the concomitant medicinal product may be necessary when stopping enzalutamide treatment.

CYP1A2 and CYP2C8 substrates

Enzalutamide (160 mg once daily) did not cause a clinically relevant change in the AUC or Cmax?of caffeine (CYP1A2 substrate) or pioglitazone (CYP2C8 substrate). The AUC of pioglitazone increased by 20% while Cmax?decreased by 18%. The AUC and Cmax?of caffeine decreased by 11% and 4% respectively. No dose adjustment is indicated when a CYP1A2 or CYP2C8 substrate is co-administered with Enzalutamide.

P-gp substrates

In vitro?data indicate that enzalutamide may be an inhibitor of the efflux transporter P-gp. The effect of enzalutamide on P-gp substrates has not been evaluated?in vivo; however, under conditions of clinical use, enzalutamide may be an inducer of P-gp via activation of the nuclear pregnane receptor (PXR). Medicinal products with a narrow therapeutic range that are substrates for P-gp (e.g. colchicine, dabigatran etexilate, digoxin) should be used with caution when administered concomitantly with Enzalutamide and may require dose adjustment to maintain optimal plasma concentrations.

BCRP, MRP2, OAT3 and OCT1 substrates

Based on?in vitro?data, inhibition of BCRP and MRP2 (in the intestine), as well as organic anion transporter 3 (OAT3) and organic cation transporter 1 (OCT1) (systemically) cannot be excluded. Theoretically, induction of these transporters is also possible, and the net effect is presently unknown.

Medicinal products which prolong the QT interval

Since androgen deprivation treatment may prolong the QT interval, the concomitant use of Enzalutamide with medicinal products known to prolong the QT interval or medicinal products able to induce Torsade de pointes such as class IA (e.g. quinidine, disopyramide) or class III (e.g. amiodarone, sotalol, dofetilide, ibutilide) antiarrhythmic medicinal products, methadone, moxifloxacin, antipsychotics, etc. should be carefully evaluated (see section 4.4).

Effect of food on enzalutamide exposures

Food has no clinically significant effect on the extent of exposure to enzalutamide. In clinical trials, Enzalutamide was administered without regard to food.

?4.6 Fertility, pregnancy and lactation

Women of childbearing potential

There are no human data on the use of Enzalutamide in pregnancy and this medicinal product is not for use in women of childbearing potential. This medicine may cause harm to the unborn child or potential loss of pregnancy if taken by women who are pregnant (see sections 4.3, 5.3, and 6.6).

Contraception in males and females

It is not known whether enzalutamide or its metabolites are present in semen. A condom is required during and for 3 months after treatment with enzalutamide if the patient is engaged in sexual activity with a pregnant woman. If the patient engages in sexual intercourse with a woman of childbearing potential, a condom and another form of birth control must be used during and for 3 months after treatment. Studies in animals have shown reproductive toxicity (see section 5.3).

Pregnancy

Enzalutamide is not for use in women. Enzalutamide is contraindicated in women who are or may become pregnant (see sections 4.3, 5.3, and 6.6).

Breast-feeding

Enzalutamide is not for use in women. It is not known if enzalutamide is present in human milk. Enzalutamide and/or its metabolites are secreted in rat milk (see section 5.3).

Fertility

Animal studies showed that enzalutamide affected the reproductive system in male rats and dogs (see section 5.3).

?4.7 Effects on ability to drive and use machines

Enzalutamide has moderate influence on the ability to drive and use machines as psychiatric and neurologic events including seizure have been reported (see section 4.8). Patients should be advised of the potential risk of experiencing a psychiatric or neurological event while driving or operating machines. No studies to evaluate the effects of enzalutamide on the ability to drive and use machines have been conducted.

?

4.8 Undesirable effects

Summary of the safety profile

The most common adverse reactions are asthenia/fatigue, hot flush, fractures, and hypertension. Other important adverse reactions include fall, cognitive disorder, and neutropenia.

Seizure occurred in 0.4% of enzalutamide-treated patients, 0.1% of placebo-treated patients and 0.3% in bicalutamide-treated patients.

Rare cases of posterior reversible encephalopathy syndrome have been reported in enzalutamide-treated patients (see section 4.4).

Tabulated list of adverse reactions

Adverse reactions observed during clinical studies are listed below by frequency category. Frequency categories are defined as follows: very common (? 1/10); common (? 1/100 to < 1/10); uncommon (? 1/1,000 to < 1/100); rare (? 1/10,000 to < 1/1,000); very rare (< 1/10,000); not known (cannot be estimated from the available data). Within each frequency grouping, adverse reactions are presented in order of decreasing seriousness.

Table 1: Adverse reactions identified in controlled clinical trials and post-marketing

MedDRA System organ classAdverse reaction and frequency
Blood and lymphatic system disordersUncommon: leucopenia, neutropenia

Not known*: thrombocytopenia

Immune system disordersNot known*: face oedema, tongue oedema, lip oedema, pharyngeal oedema
Psychiatric disordersCommon: anxiety

Uncommon: visual hallucination

Nervous system disordersCommon: headache, memory impairment, amnesia, disturbance in attention, restless legs syndrome

Uncommon: cognitive disorder, seizure?

Not known*: posterior reversible encephalopathy syndrome

Cardiac disordersCommon: ischemic heart disease?

Not known*: QT-prolongation (see sections 4.4 and 4.5)

Vascular disordersVery common: hot flush, hypertension
Gastrointestinal disordersNot known*: nausea, vomiting, diarrhoea
Skin and subcutaneous tissue disordersCommon: dry skin, pruritus

Not known*: rash

Musculoskeletal and connective tissue disordersVery common: fractures?

Not known*: myalgia, muscle spasms, muscular weakness, back pain

Reproductive system and breast disorderCommon: gynaecomastia
General disorders and administration site conditionsVery common: asthenia, fatigue
Injury, poisoning and procedural complicationsCommon: fall

* Spontaneous reports from post-marketing experience

? As evaluated by narrow SMQs of ‘Convulsions’ including convulsion, grand mal convulsion, complex partial seizures, partial seizures, and status epilepticus. This includes rare cases of seizure with complications leading to death.

? As evaluated by narrow SMQs of ‘Myocardial Infarction’ and ‘Other Ischemic Heart Disease’ including the following preferred terms observed in at least two patients in randomized placebo-controlled phase 3 studies: angina pectoris, coronary artery disease, myocardial infarctions, acute myocardial infarction, acute coronary syndrome, angina unstable, myocardial ischaemia, and arteriosclerosis coronary artery.

? Includes all preferred terms with the word ‘fracture’ in bones.

Description of selected adverse reactions

Seizure

In controlled clinical studies, 13 patients (0.4%) experienced a seizure out of 3179 patients treated with a daily dose of 160 mg enzalutamide, whereas one patient (0.1%) receiving placebo and one patient (0.3%) receiving bicalutamide, experienced a seizure. Dose appears to be an important predictor of the risk of seizure, as reflected by preclinical data, and data from a dose-escalation study. In the controlled clinical studies, patients with prior seizure or risk factors for seizure were excluded.

In the 9785-CL-0403 (UPWARD) single-arm trial to assess incidence of seizure in patients with predisposing factors for seizure (whereof 1.6% had a history of seizures), 8 of 366 (2.2%) patients treated with enzalutamide experienced a seizure. The median duration of treatment was 9.3 months.

The mechanism by which enzalutamide may lower the seizure threshold is not known, but could be related to data from?in vitro?studies showing that enzalutamide and its active metabolite bind to and can inhibit the activity of the GABA-gated chloride channel.

Ischemic Heart Disease

In randomized placebo-controlled clinical studies, ischemic heart disease occurred in 2.5% of patients treated with enzalutamide plus ADT compared to 1.3 % patients treated with placebo plus ADT.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product.

?4.9 Overdose

There is no antidote for enzalutamide. In the event of an overdose, treatment with enzalutamide should be stopped and general supportive measures initiated taking into consideration the half-life of 5.8 days. Patients may be at increased risk of seizures following an overdose.

5.PHARMACOLOGICAL PROPERTIES

5.1 Pharmacodynamic properties

Pharmacotherapeutic group: hormone antagonists and related agents, anti-androgens.

Mechanism of action

Prostate cancer is known to be androgen sensitive and responds to inhibition of androgen receptor signalling. Despite low or even undetectable levels of serum androgen, androgen receptor signalling continues to promote disease progression. Stimulation of tumour cell growth via the androgen receptor requires nuclear localization and DNA binding. Enzalutamide is a potent androgen receptor signalling inhibitor that blocks several steps in the androgen receptor signalling pathway. Enzalutamide competitively inhibits androgen binding to androgen receptors, and consequently; inhibits nuclear translocation of activated receptors and inhibits the association of the activated androgen receptor with DNA even in the setting of androgen receptor overexpression and in prostate cancer cells resistant to anti-androgens. Enzalutamide treatment decreases the growth of prostate cancer cells and can induce cancer cell death and tumour regression. In preclinical studies enzalutamide lacks androgen receptor agonist activity.

Pharmacodynamic effects

In a phase 3 clinical trial (AFFIRM) of patients who failed prior chemotherapy with docetaxel, 54% of patients treated with enzalutamide, versus 1.5% of patients who received placebo, had at least a 50% decline from baseline in PSA levels.

In another phase 3 clinical trial (PREVAIL) in chemo-na?ve patients, patients receiving enzalutamide demonstrated a significantly higher total PSA response rate (defined as a ? 50% reduction from baseline), compared with patients receiving placebo, 78.0% versus 3.5% (difference = 74.5%, p < 0.0001).

In a phase 2 clinical trial (TERRAIN) in chemo-na?ve patients, patients receiving enzalutamide demonstrated a significantly higher total PSA response rate (defined as a ? 50% reduction from baseline), compared with patients receiving bicalutamide, 82.1% versus 20.9% (difference = 61.2%, p < 0.0001)

In a single arm trial (9785-CL-0410) of patients previously treated with at least 24 weeks of abiraterone (plus prednisone), 22.4% had a ? 50% decrease from baseline in PSA levels. According to prior chemotherapy history, the results proportion of patients with a ? 50% decrease in PSA levels were 22.1% and 23.2%, for the no prior chemotherapy and prior chemotherapy patient groups, respectively.

In the MDV3100-09 clinical trial (STRIVE) of non-metastatic and metastatic CRPC, patients receiving enzalutamide demonstrated a significantly higher total confirmed PSA response rate (defined as a ? 50% reduction from baseline) compared with patients receiving bicalutamide, 81.3% versus 31.3% (difference = 50.0%, p < 0.0001).

In the MDV3100-14 clinical trial (PROSPER) of non-metastatic CRPC, patients receiving enzalutamide demonstrated a significantly higher confirmed PSA response rate (defined as a ? 50% reduction from baseline), compared with patients receiving placebo, 76.3% versus 2.4% (difference = 73.9%, p < 0.0001).

Clinical efficacy and safety

Efficacy of enzalutamide was established in three randomised placebo-controlled multicentre phase 3 clinical studies [MDV3100-14 (PROSPER), CRPC2 (AFFIRM), MDV3100-03 (PREVAIL)] of patients with progressive prostate cancer who had failed androgen deprivation therapy [LHRH analogue or after bilateral orchiectomy]. The PREVAIL study enrolled metastatic CRPC chemotherapy-na?ve patients; whereas the AFFIRM study enrolled metastatic CRPC patients who had received prior docetaxel; and the PROSPER study enrolled patients with non-metastatic CRPC. All patients continued on a LHRH analogue or had prior bilateral orchiectomy. In the active treatment arm, Enzalutamide was administered orally at a dose of 160 mg daily. In the three clinical trials, patients received placebo in the control arm and patients were allowed, but not required, to take prednisone (maximum daily dose allowed was 10 mg prednisone or equivalent).

Changes in PSA serum concentration independently do not always predict clinical benefit. Therefore, in the three studies it was recommended that patients be maintained on their study treatments until discontinuation criteria were met as specified below for each study.

MDV3100-14 (PROSPER) study (patients with non-metastatic CRPC)

The PROSPER study enrolled 1401 patients with asymptomatic, high-risk non-metastatic CRPC who continued on androgen deprivation therapy (ADT; defined as LHRH analogue or prior bilateral orchiectomy). Patients were required to have a PSA doubling time ? 10 months, PSA ? 2 ng/mL, and confirmation of non-metastatic disease by blinded independent central review (BICR).

Patients with a history of mild to moderate heart failure (NYHA Class I or II), and patients taking medicinal products associated with lowering the seizure threshold were allowed. Patients were excluded with a previous history of seizure, a condition that might predispose them to seizure, or certain prior treatments for prostate cancer (i.e., chemotherapy, ketoconazole, abiraterone acetate, aminoglutethimide and/or enzalutamide).

Patients were randomised 2:1 to receive either enzalutamide at a dose of 160 mg once daily (N = 933) or placebo (N = 468). Patients were stratified by Prostate Specific Antigen (PSA) Doubling Time (PSADT) (< 6 months or ? 6 months) and the use of bone-targeting agents (yes or no).

The demographic and baseline characteristics were well-balanced between the two treatment arms. The median age at randomisation was 74 years in the enzalutamide arm and 73 years in the placebo arm. Most patients (approximately 71%) in the study were Caucasian; 16% were Asian and 2% were Black. Eighty-one percent (81%) of patients had an ECOG performance status score of 0 and 19% patients had an ECOG performance status of 1.

Metastasis-free survival (MFS) was the primary endpoint defined as the time from randomisation to radiographic progression or death within 112 days of treatment discontinuation without evidence of radiographic progression, whichever occurred first. Key secondary endpoints assessed in the study were time to PSA progression, time to first use of new antineoplastic therapy (TTA), overall survival (OS). Additional secondary endpoints included time to first use of cytotoxic chemotherapy and chemotherapy-free survival. See results below (Table 2).

Enzalutamide demonstrated a statistically significant 71% reduction in the relative risk of radiographic progression or death compared to placebo [HR = 0.29 (95% CI: 0.24, 0.35), p < 0.0001]. Median MFS was 36.6 months (95% CI: 33.1, NR) on the enzalutamide arm versus 14.7 months (95% CI: 14.2, 15.0) on the placebo arm. Consistent MFS results were also observed in all pre-specified patient sub-groups including PSADT (< 6 months or ? 6 months), demographic region (North America, Europe, rest of world), age (< 75 or ? 75), use of a prior bone-targeting agent (yes or no).

Table 2: Summary of efficacy results in the PROSPER study (intent-to-treat analysis)

Enzalutamide

N = 933

Placebo

N = 468

Primary Endpoint
Metastasis-free survival
Number of Events (%)219 (23.5)228 (48.7)
Median, months (95% CI)136.6 (33.1, NR)14.7 (14.2, 15.0)
Hazard Ratio (95% CI)20.29 (0.24, 0.35)
P-value3p < 0.0001
Key Secondary Efficacy Endpoints
Time to PSA progression
Number of Events (%)208 (22.3)324 (69.2)
Median, months (95% CI)137.2 (33.1, NR)3.9 (3.8, 4.0)
Hazard Ratio (95% CI)20.07 (0.05, 0.08)
P-value3p < 0.0001
Time to first use of new antineoplastic therapy
Number of Events (%)142 (15.2)226 (48.3)
Median, months (95% CI)139.6 (37.7, NR)17.7 (16.2, 19.7)
Hazard Ratio (95% CI)20.21 (0.17, 0.26)
P-value3p < 0.0001

NR = Not reached.

  1. Based on Kaplan-Meier estimates.
  2. HR is based on a Cox regression model (with treatment as the only covariate) stratified by PSA doubling time and prior or concurrent use of a bone targeting agent. The HR is relative to placebo with < 1 favouring enzalutamide.
  3. P-value is based on a stratified log-rank test by PSA doubling time (< 6 months, ? 6 months) and prior or concurrent use of a bone targeting agent (yes, no).

Figure 1: Kaplan-Meier Curves of metastasis-free survival in the PROSPER study (intent-to-treat analysis)

Overall survival was evaluated at two prespecified interim analyses to date; the first at the time of final MFS (n = 165) [HR = 0.80 (95% CI: 0.58, 1.09), p = 0.1519], and the second interim analysis (n = 288) [HR = 0.83 (95% CI: 0.65, 1.06), p = 0.1344]. The median was not reached in either treatment group and neither analysis showed a statistically significant difference between treatment arms.

Enzalutamide demonstrated a statistically significant 93% reduction in the relative risk of PSA progression compared to placebo [HR = 0.07 (95% CI: 0.05, 0.08), p < 0.0001]. Median time to PSA progression was 37.2 months (95% CI: 33.1, NR) on the enzalutamide arm versus 3.9 months (95% CI: 3.8, 4.0) on the placebo arm.

Enzalutamide demonstrated a statistically significant delay in the time to first use of new antineoplastic therapy compared to placebo [HR = 0.21 (95% CI: 0.17, 0.26), p < 0.0001]. Median time to first use of new antineoplastic therapy was 39.6 months (95% CI: 37.7, NR) on the enzalutamide arm versus 17.7 months (95% CI: 16.2, 19.7) on the placebo arm.

Figure 2: Kaplan-Meier curves of time to first use of new antineoplastic therapy in the PROSPER study (intent-to-treat analysis)

MDV3100-09 (STRIVE) study (chemotherapy-na?ve patients with non-metastatic/metastatic CRPC)

The STRIVE study enrolled 396 non-metastatic or metastatic CRPC patients who had serologic or radiographic disease progression despite primary androgen deprivation therapy who were randomised to receive either enzalutamide at a dose of 160 mg once daily (N = 198) or bicalutamide at a dose of 50 mg once daily (N = 198). PFS was the primary endpoint defined as the time from randomisation to the earliest objective evidence of radiographic progression, PSA progression, or death on study. Median PFS was 19.4 months (95% CI: 16.5, not reached) in the enzalutamide group versus 5.7 months (95% CI: 5.6, 8.1) in the bicalutamide group [HR = 0.24 (95% CI: 0.18, 0.32), p < 0.0001]. Consistent benefit of enzalutamide over bicalutamide on PFS was observed in all pre-specified patient subgroups. For the non-metastatic subgroup (N = 139) a total of 19 out of 70 (27.1%) patients treated with enzalutamide and 49 out of 69 (71.0%) patients treated with bicalutamide had PFS events (68 total events). The hazard ratio was 0.24 (95% CI: 0.14, 0.42) and the median time to a PFS event was not reached in the enzalutamide group versus 8.6 months in the bicalutamide group.

Figure 3: Kaplan-Meier Curves of progression-free survival in the STRIVE study (intent-to-treat analysis)

9785-CL-0222 (TERRAIN) study (chemotherapy-na?ve patients with metastatic CRPC)

The TERRAIN study enrolled 375 chemo- and antiandrogen-therapy na?ve patients with metastatic CRPC who were randomised to receive either enzalutamide at a dose of 160 mg once daily (N = 184) or bicalutamide at a dose of 50 mg once daily (N = 191). Median PFS was 15.7 months for patients on enzalutamide versus 5.8 months for patients on bicalutamide [HR = 0.44 (95% CI: 0.34, 0.57), p < 0.0001]. Progression-free survival was defined as objective evidence of radiographic disease progression by independent central review, skeletal-related events, initiation of new antineoplastic therapy or death by any cause, whichever occurred first. Consistent PFS benefit was observed across all pre-specified patient subgroups.

MDV3100-03 (PREVAIL) study (chemotherapy-na?ve patients with metastatic CRPC)

A total of 1717 asymptomatic or mildly symptomatic chemotherapy-na?ve patients were randomised 1:1 to receive either enzalutamide orally at a dose of 160 mg once daily (N = 872) or placebo orally once daily (N = 845). Patients with visceral disease, patients with a history of mild to moderate heart failure (NYHA Class I or II), and patients taking medicinal products associated with lowering the seizure threshold were allowed. Patients with a previous history of seizure or a condition that might predispose to seizure and patients with moderate or severe pain from prostate cancer were excluded. Study treatment continued until disease progression (evidence of radiographic progression, a skeletal-related event, or clinical progression) and the initiation of either a cytotoxic chemotherapy or an investigational agent, or until unacceptable toxicity.

Patient demographics and baseline disease characteristics were balanced between the treatment arms. The median age was 71 years (range 42 – 93) and the racial distribution was 77% Caucasian, 10% Asian, 2% Black and 11% other or unknown races. Sixty-eight percent (68%) of patients had an ECOG performance status score of 0 and 32% patients had an ECOG performance status of 1. Baseline pain assessment was 0 – 1 (asymptomatic) in 67% of patients and 2 – 3 (mildly symptomatic) in 32% of patients as defined by the Brief Pain Inventory Short Form (worst pain over past 24 hours on a scale of 0 to 10). Approximately 45% of patients had measurable soft tissue disease at study entry, and 12% of patients had visceral (lung and/or liver) metastases.

Co-primary efficacy endpoints were overall survival and radiographic progression-free survival (rPFS). In addition to the co-primary endpoints, benefit was also assessed using time to initiation of cytotoxic chemotherapy, best overall soft tissue response, time to first skeletal-related event, PSA response (? 50% decrease from baseline), time to PSA progression, and time to FACT-P total score degradation.

Radiographic progression was assessed with the use of sequential imaging studies as defined by Prostate Cancer Clinical Trials Working Group 2 (PCWG2) criteria (for bone lesions) and/or Response Evaluation Criteria in Solid Tumors (RECIST v 1.1) criteria (for soft tissue lesions). Analysis of rPFS utilised centrally-reviewed radiographic assessment of progression.

At the pre-specified interim analysis for overall survival when 540 deaths were observed, treatment with enzalutamide demonstrated a statistically significant improvement in overall survival compared to treatment with placebo with a 29.4% reduction in risk of death [HR = 0.706 (95% CI: 0.60; 0.84), p < 0.0001]. An updated survival analysis was conducted when 784 deaths were observed. Results from this analysis were consistent with those from the interim analysis (Table 3, Figure 4). At the updated analysis 52% of enzalutamide-treated and 81% of placebo-treated patients had received subsequent therapies for metastatic CRPC that may prolong overall survival.

Table 3: Overall survival of patients treated with either enzalutamide or placebo in the PREVAIL study (intent-to-treat analysis)

Enzalutamide

(N = 872)

Placebo

(N = 845)

Pre-specified interim analysis
Number of deaths (%)241 (27.6%)299 (35.4%)
Median survival, months (95% CI)32.4 (30.1, NR)30.2 (28.0, NR)
P-value1p < 0.0001
Hazard ratio (95% CI)20.71 (0.60, 0.84)
Updated survival analysis
Number of deaths (%)368 (42.2%)416 (49.2%)
Median survival, months (95% CI)35.3 (32.2, NR)31.3 (28.8, 34.2)
P-value1p = 0.0002
Hazard ratio (95% CI)20.77 (0.67, 0.88)

NR = Not reached.

  1. P-value is derived from an unstratified log-rank test.
  2. Hazard Ratio is derived from an unstratified proportional hazards model. Hazard ratio < 1 favours enzalutamide.

Figure 4: Kaplan-Meier curves of overall survival based on updated survival analysis in the PREVAIL study (intent-to-treat analysis)

Figure 5: Updated overall survival analysis by subgroup: Hazard ratio and 95% confidence interval in the PREVAIL study (intent-to-treat analysis)

At the pre-specified rPFS analysis, a statistically significant improvement was demonstrated between the treatment groups with an 81.4% reduction in risk of radiographic progression or death [HR = 0.19 (95% CI: 0.15, 0.23), p < 0.0001]. One hundred and eighteen (14%) enzalutamide-treated patients and 321 (40%) of placebo-treated patients had an event. The median rPFS was not reached (95% CI: 13.8, not reached) in the enzalutamide-treated group and was 3.9 months (95% CI: 3.7, 5.4) in the placebo-treated group (Figure 6). Consistent rPFS benefit was observed across all pre-specified patient subgroups (e.g. age, baseline ECOG performance, baseline PSA and LDH, Gleason score at diagnosis, and visceral disease at screening). A pre-specified follow-up rPFS analysis based on the investigator assessment of radiographic progression demonstrated a statistically significant improvement between the treatment groups with a 69.3% reduction in risk of radiographic progression or death [HR = 0.31 (95% CI: 0.27, 0.35), p < 0.0001]. The median rPFS was 19.7 months in the enzalutamide group and 5.4 months in the placebo group.

At the time of the primary analysis there were 1,633 patients randomised.

In addition to the co-primary efficacy endpoints, statistically significant improvements were also demonstrated in the following prospectively defined endpoints.

The median time to initiation of cytotoxic chemotherapy was 28.0 months for patients receiving enzalutamide and 10.8 months for patients receiving placebo [HR = 0.35 (95% CI: 0.30, 0.40), p < 0.0001].

The proportion of enzalutamide-treated patients with measurable disease at baseline who had an objective soft tissue response was 58.8% (95% CI: 53.8, 63.7) compared with 5.0% (95% CI: 3.0, 7.7) of patients receiving placebo. The absolute difference in objective soft tissue response between enzalutamide and placebo arms was [53.9% (95% CI: 48.5, 59.1), p < 0.0001]. Complete responses were reported in 19.7% of enzalutamide-treated patients compared with 1.0% of placebo-treated patients, and partial responses were reported in 39.1% of enzalutamide-treated patients versus 3.9% of placebo-treated patients.

Enzalutamide significantly decreased the risk of the first skeletal-related event by 28% [HR = 0.718 (95% CI: 0.61, 0.84), p < 0.0001]. A skeletal-related event was defined as radiation therapy or surgery to bone for prostate cancer, pathologic bone fracture, spinal cord compression, or change of antineoplastic therapy to treat bone pain. The analysis included 587 skeletal-related events, of which 389 events (66.3%) were radiation to bone, 79 events (13.5%) were spinal cord compression, 70 events (11.9%) were pathologic bone fracture, 45 events (7.6%) were change in antineoplastic therapy to treat bone pain, and 22 events (3.7%) were surgery to bone.

Patients receiving enzalutamide demonstrated a significantly higher total PSA response rate (defined as a ? 50% reduction from baseline), compared with patients receiving placebo, 78.0% versus 3.5% (difference = 74.5%, p < 0.0001).

The median time to PSA progression per PCWG2 criteria was 11.2 months for patients treated with enzalutamide and 2.8 months for patients who received placebo [HR = 0.17 (95% CI: 0.15, 0.20), p < 0.0001].

Treatment with enzalutamide decreased the risk of FACT-P degradation by 37.5% compared with placebo (p < 0.0001). The median time to degradation in FACT-P was 11.3 months in the enzalutamide group and 5.6 months in the placebo group.

CRPC2 (AFFIRM) study (patients with metastatic CRPC who previously received chemotherapy)

The efficacy and safety of enzalutamide in patients with metastatic CRPC who had received docetaxel and were using a LHRH analogue or had undergone orchiectomy were assessed in a randomised, placebo-controlled, multicentre phase 3 clinical trial. A total of 1199 patients were randomised 2:1 to receive either enzalutamide orally at a dose of 160 mg once daily (N = 800) or placebo once daily (N = 399). Patients were allowed but not required to take prednisone (maximum daily dose allowed was 10 mg prednisone or equivalent). Patients randomised to either arm were to continue treatment until disease progression (defined as confirmed radiographic progression or the occurrence of a skeletal-related event) and initiation of new systemic antineoplastic treatment, unacceptable toxicity, or withdrawal.

The following patient demographics and baseline disease characteristics were balanced between the treatment arms. The median age was 69 years (range 41 – 92) and the racial distribution was 93% Caucasian, 4% Black, 1% Asian, and 2% Other. The ECOG performance score was 0 – 1 in 91.5% of patients and 2 in 8.5% of patients; 28% had a mean Brief Pain Inventory score of ? 4 (mean of patient’s reported worst pain over the previous 24 hours calculated for seven days prior to randomisation). Most (91%) patients had metastases in bone and 23% had visceral lung and/or liver involvement. At study entry, 41% of randomised patients had PSA progression only, whereas 59% of patients had radiographic progression. Fifty-one percent (51%) of patients were on bisphosphonates at baseline.

The AFFIRM study excluded patients with medical conditions that may predispose them to seizures (see section 4.8) and medicinal products known to decrease the seizure threshold, as well as clinically significant cardiovascular disease such as uncontrolled hypertension, recent history of myocardial infarction or unstable angina, New York Heart Association class III or IV heart failure (unless ejection fraction was ? 45%), clinically significant ventricular arrhythmias or AV block (without permanent pacemaker).

The protocol pre-specified interim analysis after 520 deaths showed a statistically significant superiority in overall survival in patients treated with enzalutamide compared to placebo (Table 4 and Figures 7 and 8).

Table 4: Overall survival of patients treated with either enzalutamide or placebo in the AFFIRM study (intent-to-treat analysis)

Enzalutamide?(N = 800)Placebo (N = 399)
Deaths (%)308 (38.5%)212 (53.1%)
Median survival (months) (95% CI)18.4 (17.3, NR)13.6 (11.3, 15.8)
P-value1p < 0.0001
Hazard ratio (95% CI)20.63 (0.53, 0.75)

NR = Not Reached.

  1. P-value is derived from a log rank test stratified by ECOG performance status score (0-1 vs. 2) and mean pain score (< 4 vs. ? 4).
  2. Hazard Ratio is derived from a stratified proportional hazards model. Hazard ratio < 1 favours enzalutamide.

Figure 6: Kaplan-Meier curves of overall survival in the AFFIRM study (intent-to-treat analysis)

ECOG: Eastern Cooperative Oncology Group; BPI-SF: Brief Pain Inventory-Short Form; PSA: Prostate Specific Antigen

In addition to the observed improvement in overall survival, key secondary endpoints (PSA progression, radiographic progression-free survival, and time to first skeletal-related event) favoured enzalutamide and were statistically significant after adjusting for multiple testing.

Radiographic progression-free survival as assessed by the investigator using RECIST v 1.1 for soft tissue and appearance of 2 or more bone lesions in bone scan was 8.3 months for patients treated with enzalutamide and 2.9 months for patients who received placebo [HR = 0.40 (95% CI: 0.35, 0.47), p < 0.0001]. The analysis involved 216 deaths without documented progression and 645 documented progression events, of which 303 (47%) were due to soft tissue progression, 268 (42%) were due to bone lesion progression and 74 (11%) were due to both soft tissue and bone lesions.

Confirmed PSA decline of 50% or 90% were 54.0% and 24.8%, respectively, for patients treated with enzalutamide and 1.5% and 0.9%, respectively, for patients who received placebo (p < 0.0001). The median time to PSA progression was 8.3 months for patients treated with enzalutamide and 3.0 months for patients who received placebo [HR = 0.25 (95% CI: 0.20, 0.30), p < 0.0001].

The median time to first skeletal-related event was 16.7 months for patients treated with enzalutamide and 13.3 months for patients who received placebo [HR = 0.69 (95% CI: 0.57, 0.84), p < 0.0001]. A skeletal-related event was defined as radiation therapy or surgery to bone, pathologic bone fracture, spinal cord compression or change of antineoplastic therapy to treat bone pain. The analysis involved 448 skeletal-related events, of which 277 events (62%) were radiation to bone, 95 events (21%) were spinal cord compression, 47 events (10%) were pathologic bone fracture, 36 events (8%) were change in antineoplastic therapy to treat bone pain, and 7 events (2%) were surgery to bone.

9785-CL-0410 study (enzalutamide post abiraterone in patients with metastatic CRPC)

The study was a single-arm study in 214 patients with progressing metastatic CRPC who received enzalutamide (160 mg once daily) after at least 24 weeks of treatment with abiraterone acetate plus prednisone. Median rPFS (radiologic progression free survival, the study?s primary endpoint) was 8.1 months (95% CI: 6.1, 8.3). Median OS was not reached. PSA Response (defined as ? 50% decrease from baseline) was 22.4% (95% CI: 17.0, 28.6). For the 69 patients who previously received chemotherapy, median rPFS was 7.9 months (95% CI: 5.5, 10.8). PSA Response was 23.2% (95% CI: 13.9, 34.9). For the 145 patients who had no previous chemotherapy, median rPFS was 8.1 months (95% CI: 5.7, 8.3). PSA Response was 22.1% (95% CI: 15.6, 29.7).

Although there was a limited response in some patients from treatment with enzalutamide after abiraterone, the reason for this finding is currently unknown. The study design could neither identify the patients who are likely to benefit, nor the order in which enzalutamide and abiraterone should be optimally sequenced.

Elderly

Of the 3179 patients in the controlled clinical trials who received enzalutamide, 2518 patients (79%) were 65 years and over and 1162 patients (37%) were 75 years and over. No overall differences in safety or effectiveness were observed between these elderly patients and younger patients.

Paediatric population

The European Medicines Agency has waived the obligation to submit the results of studies with enzalutamide in all subsets of the paediatric population in prostate carcinoma (see section 4.2 for information on paediatric use).

?5.2 Pharmacokinetic properties

Enzalutamide is poorly water soluble. The solubility of enzalutamide is increased by caprylocaproyl macrogolglycerides as emulsifier/surfactant. In preclinical studies, the absorption of enzalutamide was increased when dissolved in caprylocaproyl macrogolglycerides.

The pharmacokinetics of enzalutamide have been evaluated in prostate cancer patients and in healthy male subjects. The mean terminal half-life (t1/2) for enzalutamide in patients after a single oral dose is 5.8 days (range 2.8 to 10.2 days), and steady state is achieved in approximately one month. With daily oral administration, enzalutamide accumulates approximately 8.3-fold relative to a single dose. Daily fluctuations in plasma concentrations are low (peak-to-trough ratio of 1.25). Clearance of enzalutamide is primarily via hepatic metabolism, producing an active metabolite that is equally as active as enzalutamide and circulates at approximately the same plasma concentration as enzalutamide.

Absorption

Maximum plasma concentrations (Cmax) of enzalutamide in patients are observed 1 to 2 hours after administration. Based on a mass balance study in humans, oral absorption of enzalutamide is estimated to be at least 84.2%. Enzalutamide is not a substrate of the efflux transporters P-gp or BCRP. At steady state, the mean Cmax?values for enzalutamide and its active metabolite are 16.6 ?g/mL (23% coefficient of variation [CV]) and 12.7 ?g/mL (30% CV), respectively.

Food has no clinically significant effect on the extent of absorption. In clinical trials, Enzalutamide was administered without regard to food.

Distribution

The mean apparent volume of distribution (V/F) of enzalutamide in patients after a single oral dose is 110 L (29% CV). The volume of distribution of enzalutamide is greater than the volume of total body water, indicative of extensive extravascular distribution. Studies in rodents indicate that enzalutamide and its active metabolite can cross the blood brain barrier.

Enzalutamide is 97% to 98% bound to plasma proteins, primarily albumin. The active metabolite is 95% bound to plasma proteins. There was no protein binding displacement between enzalutamide and other highly bound medicinal products (warfarin, ibuprofen and salicylic acid)?in vitro.

Biotransformation

Enzalutamide is extensively metabolised. There are two major metabolites in human plasma: N-desmethyl enzalutamide (active) and a carboxylic acid derivative (inactive). Enzalutamide is metabolised by CYP2C8 and to a lesser extent by CYP3A4/5 (see section 4.5), both of which play a role in the formation of the active metabolite.?In vitro, N-desmethyl enzalutamide is metabolised to the carboxylic acid metabolite by carboxylesterase 1, which also plays a minor role in the metabolism of enzalutamide to the carboxylic acid metabolite. N-desmethyl enzalutamide was not metabolised by CYPs?in vitro.

Under conditions of clinical use, enzalutamide is a strong inducer of CYP3A4, a moderate inducer of CYP2C9 and CYP2C19, and has no clinically relevant effect on CYP2C8 (see section 4.5).

Elimination

The mean apparent clearance (CL/F) of enzalutamide in patients ranges from 0.520 and 0.564 L/h.

Following oral administration of?14C-enzalutamide, 84.6% of the radioactivity is recovered by 77 days post dose: 71.0% is recovered in urine (primarily as the inactive metabolite, with trace amounts of enzalutamide and the active metabolite), and 13.6% is recovered in faeces (0.39% of dose as unchanged enzalutamide).

In vitro?data indicate that enzalutamide is not a substrate for OATP1B1, OATP1B3, or OCT1; and N-desmethyl enzalutamide is not a substrate for P-gp or BCRP.

In vitro?data indicate that enzalutamide and its major metabolites do not inhibit the following transporters at clinically relevant concentrations: OATP1B1, OATP1B3, OCT2, or OAT1.

Linearity

No major deviations from dose proportionality are observed over the dose range 40 to 160 mg. The steady-state Cmin?values of enzalutamide and the active metabolite in individual patients remained constant during more than one year of chronic therapy, demonstrating time-linear pharmacokinetics once steady-state is achieved.

Renal impairment

No formal renal impairment study for enzalutamide has been completed. Patients with serum creatinine > 177 ?mol/L (2 mg/dL) were excluded from clinical trials. Based on a population pharmacokinetic analysis, no dose adjustment is necessary for patients with calculated creatinine clearance (CrCL) values ? 30 mL/min (estimated by the Cockcroft and Gault formula). Enzalutamide has not been evaluated in patients with severe renal impairment (CrCL < 30 mL/min) or end-stage renal disease, and caution is advised when treating these patients. It is unlikely that enzalutamide will be significantly removed by intermittent haemodialysis or continuous ambulatory peritoneal dialysis.

Hepatic impairment

Hepatic impairment did not have a pronounced effect on the total exposure to enzalutamide or its active metabolite. The half-life of enzalutamide was however doubled in patients with severe hepatic impairment compared with healthy controls (10.4 days compared to 4.7 days), possibly related to an increased tissue distribution.

The pharmacokinetics of enzalutamide were examined in subjects with baseline mild (N = 6), moderate (N = 8) or severe (N = 8) hepatic impairment (Child-Pugh Class A, B or C, respectively) and in 22 matched control subjects with normal hepatic function. Following a single oral 160 mg dose of enzalutamide, the AUC and Cmax?for enzalutamide in subjects with mild impairment increased by 5% and 24%, respectively, the AUC and Cmax?of enzalutamide in subjects with moderate impairment increased by 29% and decreased by 11%, respectively, and the AUC and Cmax?of enzalutamide in subjects with severe impairment increased by 5% and decreased by 41%, respectively, compared to healthy control subjects. For the sum of unbound enzalutamide plus the unbound active metabolite, the AUC and Cmax?in subjects with mild impairment increased by 14% and 19%, respectively, the AUC and Cmax?in subjects with moderate impairment increased by 14% and decreased by 17%, respectively, and the AUC and Cmax?in subjects with severe hepatic impairment increased by 34% and decreased by 27%, respectively, compared to healthy control subjects.

Race

Most patients in the controlled clinical trials (> 74%) were Caucasian. Based on pharmacokinetic data from studies in Japanese and Chinese patients with prostate cancer, there were no clinically relevant differences in exposure among the populations. There are insufficient data to evaluate potential differences in the pharmacokinetics of enzalutamide in other races.

Elderly

No clinically relevant effect of age on enzalutamide pharmacokinetics was seen in the elderly population pharmacokinetic analysis.

?5.3 Preclinical safety data

Enzalutamide treatment of pregnant mice resulted in an increased incidence of embryo-fetal deaths and external and skeletal changes. Reproductive toxicology studies were not conducted with enzalutamide, but in studies in rats (4 and 26 weeks) and dogs (4, 13, and 39 weeks), atrophy, aspermia/hypospermia, and hypertrophy/hyperplasia in the reproductive system were noted, consistent with the pharmacological activity of enzalutamide. In studies in mice (4 weeks), rats (4 and 26 weeks) and dogs (4, 13, and 39 weeks), changes in the reproductive organs associated with enzalutamide were decreases in organ weight with atrophy of the prostate and epididymis. Leydig cell hypertrophy and/or hyperplasia were observed in mice (4 weeks) and dogs (39 weeks). Additional changes to reproductive tissues included hypertrophy/hyperplasia of the pituitary gland and atrophy in seminal vesicles in rats and testicular hypospermia and seminiferous tubule degeneration in dogs. Gender differences were noted in rat mammary glands (male atrophy and female lobular hyperplasia). Changes in the reproductive organs in both species were consistent with the pharmacological activity of enzalutamide and reversed or partially resolved after an 8-week recovery period. There were no other important changes in clinical pathology or histopathology in any other organ system, including the liver, in either species.

Studies in pregnant rats have shown that enzalutamide and/or its metabolites are transferred to fetuses. After oral administration of radiolabeled?14C-enzalutamide to rats on day 14 of pregnancy at a dose of 30 mg/kg (~ 1.9 times the maximum dose indicated in humans), the maximum radioactivity in the fetus was reached 4 hours after administration and was lower than that in the maternal plasma with tissue/plasma ratio of 0.27. The radioactivity in the fetus decreased to 0.08 times the maximum concentration at 72 hours after administration.

Studies in lactating rats have shown that enzalutamide and/or its metabolites are secreted in rat milk. After oral administration of radiolabeled?14C-enzalutamide to lactating rats at a dose of 30 mg/kg (~ 1.9 times the maximum dose indicated in humans), the maximum radioactivity in the milk was reached 4 hours after administration and was up to 3.54-fold higher than that in the maternal plasma. Study results also have shown that enzalutamide and/or its metabolites are transferred to infant rat tissues via milk and subsequently eliminated.

Enzalutamide was negative for genotoxicity in a standard battery of?in vitro?and?in vivo?tests. In a 6-month study in transgenic rasH2 mice, enzalutamide did not show carcinogenic potential (absence of neoplastic findings) at doses up to 20 mg/kg per day (AUC24h?~317 ?g?h/mL), which resulted in plasma exposure levels similar to the clinical exposure (AUC24h?322 ?g?h/mL) in mCRPC patients receiving 160 mg, daily.

Daily dosing of rats for two years with enzalutamide at 10?100 mg/kg/day produced an increased incidence of several, mostly benign, tumour types. The most prominent of these were benign Leydig cell tumours, urothelium papilloma, and carcinoma of urinary bladder. Benign Leydig cell tumours are expected based on the pharmacological properties of this antiandrogen drug and not considered relevant to humans. Some urothelium papilloma and carcinoma of urinary bladder is expected in rats based on the horizontal structure of the rat urinary bladder, which can encounter concentrated urine and prolonged irritation from calculi. In the study, calculi and crystals were observed in rat urinary bladders. However, no obvious mechanistic rationale to explain specifically this malignancy can be established, and taking into account that exposure levels, based on AUC, achieved in the study, for enzalutamide plus its metabolites, were less than or similar to those in prostate cancer patients at the recommended dose of 160 mg/day, urinary bladder carcinogenicity potential of enzalutamide in humans cannot be excluded. Other tumours, which are also potentially related to the primary pharmacology include fibroadenoma of mammary glands and benign thymoma of thymus in males, benign granulosa cell tumours of ovaries in females, and adenoma of pituitary pars distalis in both sexes. The exposure levels achieved in this study in male rats at Week 26 at 100 mg/kg per day for enzalutamide plus its active metabolites M1 and M2 (AUC24: enzalutamide ~457 ?g?h/mL, M1 ~321 ?g?h/mL, M2 ~35 ?g?h/mL) were less than or similar to those in prostate cancer patients at the recommended dose (160 mg/day) of enzalutamide (AUC24: enzalutamide ~322 ?g?h/mL, M1 ~193 ?g?h/mL, M2 ~278 ?g?h/mL).

Enzalutamide was not phototoxic?in vitro.

?6.PHARMACEUTICAL PARTICULARS

6.1 List of excipients

Capsule contents

Caprylocaproyl macrogol-8 glycerides
Butylhydroxyanisole
Butylhydroxytoluene

Capsule shell


Gelatin
Sorbitol sorbitan solution
Glycerol
Titanium dioxide
Purified water

Printing ink

Iron oxide black
Polyvinyl acetate phthalate

6.2 Incompatibilities

Not applicable.

6.3 Shelf life

3 years.

6.4 Special precautions for storage

This medicinal product does not require any special storage conditions.

?6.5 Nature and contents of container

Cardboard wallet incorporating a PVC/PCTFE/aluminium blister of 28 soft capsules. Each carton contains 4 wallets (112 soft capsules).

?6.6 Special precautions for disposal and other handling
Enzalutamide should not be handled by persons other than the patient and his caregivers, and especially not by women who are or may become pregnant. The soft capsules should not be dissolved or opened.

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.

7. Manufactured in India By:
TAJ PHARMACEUTICALS LIMITED
Mumbai, India
Survey No.188/1 to 189/1,190/1 to 4,
Athiyawad, Dabhel,
Daman- 396210 (INDIA)

Enzalutamide soft capsules IP 40mg Taj Pharma
Package leaflet: Information for the patient

Enzalutamide

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read itagain.
  • If you have any further questions, ask your doctor orpharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harmthem, even if their signs of illness are the same asyours.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section4.

What is in this leaflet:

  1. What Enzalutamide is and what it is used for
  2. What you need to know before you take Enzalutamide
  3. How to take Enzalutamide
  4. Possible side effects
  5. How to store Enzalutamide
  6. Contents of the pack and other information
1 WHAT ENZALUTAMIDE IS AND WHAT IT IS USED FOR

Enzalutamide contains the active substance enzalutamide. Enzalutamide is used to treat adult men with prostate cancer that no longer responds to androgen deprivation therapy.

How Enzalutamide works

Enzalutamide is a medicine that works by blocking the activity of hormones called androgens (such as testosterone). By blocking androgens, enzalutamide stops prostate cancer cells from growing and dividing.

2 WHAT YOU NEED TO KNOW BEFORE YOU TAKE ENZALUTAMIDE

Do not take Enzalutamide:

  • If you are allergic to enzalutamide or any of the other ingredients of this medicine (listed in section 6).
  • If you are pregnant or may become pregnant (see ?Pregnancy, breast-feeding and fertility?)

Warnings and precautions

Seizures

Seizures were reported in 4 in every 1,000 people taking Enzalutamide, and fewer than one in every 1,000 people taking placebo (see ?Other medicines and Enzalutamide? below and section 4 ?Possible side effects?).

If you are taking a medicine that can cause seizures or that can increase the susceptibility for having seizures (see ?Other medicines and Enzalutamide? below)

If you have a seizure during treatment:

See your doctor as soon as possible. Your doctor may decide that you should stop taking Enzalutamide.

Posterior reversible encephalopathy syndrome (PRES)

There have been rare reports of PRES, a rare, reversible condition involving the brain, in patients treated with Enzalutamide. If you have a seizure, worsening headache, confusion, blindness or other vision problems, please contact your doctor as soon as possible. (See also section 4 ?Possible side effects?).

Talk to your doctor before taking Enzalutamide

  • If you are taking any medicines to prevent blood clots (e.g. warfarin, acenocoumarol, clopidogrel)
  • If you use chemotherapy like docetaxel
  • If you have problems with your liver
  • If you have problems with your kidneys

Please tell your doctor if you have any of the following:

Any heart or blood vessel conditions, including heart rhythm problems (arrhythmia), or are being treated with medicines for these conditions. The risk of heart rhythm problems may be increased when using Enzalutamide.

If you are allergic to enzalutamide, this may result in a rash or swelling of the face, tongue, lip or throat. If you are allergic to enzalutamide or any of the other ingredients of this medicine, do not take Enzalutamide.

If any of the above applies to you or you are not sure, talk to your doctor before taking this medicine.

Children and adolescents

This medicine is not for use in children and adolescents.

Other medicines and Enzalutamide

Tell your doctor if you are taking, have recently taken or might take any other medicines. You need to know the names of the medicines you take. Keep a list of them with you to show to your doctor when you are prescribed a new medicine. You should not start or stop taking any medicine before you talk with the doctor that prescribed Enzalutamide.

Tell your doctor if you are taking any of the following medicines. When taken at the same time as Enzalutamide, these medicines may increase the risk of a seizure:

  • Certain medicines used to treat asthma and other respiratory diseases (e.g. aminophylline, theophylline).
  • Medicines used to treat certain psychiatric disorders such as depression and schizophrenia (e.g. clozapine, olanzapine, risperidone, ziprasidone, bupropion, lithium, chlorpromazine, mesoridazine, thioridazine, amitriptyline, desipramine, doxepin, imipramine, maprotiline, mirtazapine).
  • Certain medicines for the treatment of pain (e.g. pethidine).

Tell your doctor if you are taking the following medicines. These medicines may influence the effect of Enzalutamide, or Enzalutamide may influence the effect of these medicines.

This includes certain medicines used to:

  • Lower cholesterol (e.g. gemfibrozil, atorvastatin, simvastatin)
  • Treat pain (e.g. fentanyl, tramadol)
  • Treat cancer (e.g. cabazitaxel)
  • Treat epilepsy (e.g. carbamazepine, clonazepam, phenytoin, primidone, valproic acid)
  • Treat certain psychiatric disorders such as severe anxiety or schizophrenia (e.g. diazepam, midazolam, haloperidol)
  • Treat sleep disorders (e.g. zolpidem)
  • Treat heart conditions or lower blood pressure (e.g. bisoprolol, digoxin, diltiazem, felodipine, nicardipine, nifedipine, propranolol, verapamil)
  • Treat serious disease related to inflammation (e.g. dexamethasone, prednisolone)
  • Treat HIV infection (e.g. indinavir, ritonavir)
  • Treat bacterial infections (e.g. clarithromycin, doxycycline)
  • Treat thyroid disorders (e.g. levothyroxine)
  • Treat gout (e.g. colchicine)
  • Treat stomach disorders (e.g. omeprazole)
  • Prevent heart conditions or strokes (e.g. dabigatran etexilate)
  • Prevent organ rejection (e.g. tacrolimus)

Enzalutamide might interfere with some medicines used to treat heart rhythm problems (e.g. quinidine, procainamide, amiodarone and sotalol) or might increase the risk of heart rhythm problems when used with some other medicines (e.g. methadone, used for pain relief and part of drug addiction detoxification), moxifloxacin (an antibiotic), antipsychotics used for serious mental illnesses).

Tell your doctor if you are taking any of the medicines listed above. The dose of Enzalutamide or any other medicines that you are taking may need to be changed.

Pregnancy, breast-feeding and fertility

  • Enzalutamide is not for use in women.This medicine may cause harm to the unborn child or potential loss of pregnancy if taken by women who are pregnant. It must not be taken by women who are pregnant, may become pregnant, or who are breast-feeding.
  • This medicine could possibly have an effect on male fertility.
  • If you are having sex with a woman who can become pregnant, use a condom and another effective birth control method, during treatment and for 3 months after treatment with this medicine. If you are having sex with a pregnant woman, use a condom to protect the unborn child.
  • Female caregivers see section 3 ?How to take Enzalutamide? for handling and use.

Driving and using machines

This medicine has moderate effect on your ability to drive or use any tools or machines as the side effects of Enzalutamide include psychiatric and neurological events including seizure. If you are at higher risk of seizures, talk to your doctor.

Enzalutamide contains sorbitol

This medicine contains 57.8 mg sorbitol (a type of sugar) per soft capsule. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine.

3 HOW TO TAKE ENZALUTAMIDE

Always take this medicine exactly as your doctor has told you. Check with your doctor if you are not sure.

The usual dose is 160 mg (four soft capsules), taken at the same time once a day.

Taking Enzalutamide

  • Swallow the soft capsules whole with water.
  • Do not chew, dissolve or open the soft capsules before swallowing.
  • Enzalutamide can be taken with or without food.
  • Enzalutamide should not be handled by persons other than the patient and his caregivers, and especially not by women who are or may become pregnant.

Your doctor may also prescribe other medicines while you are taking Enzalutamide.

If you take more Enzalutamide than you should

If you take more soft capsules than prescribed, stop taking Enzalutamide and contact your doctor. You may have an increased risk of seizure or other side effects.

If you forget to take Enzalutamide

  • If you forget to take Enzalutamide at the usual time, take your usual dose as soon as you remember.
  • If you forget to take Enzalutamide for the whole day, take your usual dose the following day.
  • If you forget to take Enzalutamide for more than one day, talk to your doctor immediately.
  • Do not take a double doseto make up for the dose you forgot.

If you stop taking Enzalutamide

Do not stop taking this medicine unless your doctor tells you to.

If you have any further questions on the use of this medicine, ask your doctor.

4 POSSIBLE SIDE EFFECTS

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Seizures

Seizures were reported in 4 in every 1,000 people taking Enzalutamide, and in fewer than one in every 1,000 people taking placebo.

Seizures are more likely if you take more than the recommended dose of this medicine, if you take certain other medicines, or if you are at higher than usual risk of seizure.

If you have a seizure, see your doctor as soon as possible. Your doctor may decide that you should stop taking Enzalutamide.

Posterior Reversible Encephalopathy Syndrome (PRES)

There have been rare reports of PRES (may affect up to 1 in 1,000 people), a rare, reversible condition involving the brain, in patients treated with Enzalutamide. If you have a seizure, worsening headache, confusion, blindness or other vision problems, please contact your doctor as soon as possible.

Other possible side effects include:

Very common?(may affect more than 1 in 10 people)

Tiredness, broken bones, hot flushes, high blood pressure

Common?(may affect up to 1 in 10 people)

Headache, fall, feeling anxious, dry skin, itching, difficulty remembering, blockage of the arteries in the heart (ischemic heart disease), breast enlargement in men (gynaecomastia), symptom of restless legs syndrome (an uncontrollable urge to move a part of the body, usually the leg), reduced concentration, forgetfulness

Uncommon?(may affect up to 1 in 100 people)

Hallucinations, difficulty thinking clearly, low white blood cell count

Not known?(frequency cannot be estimated from the available data)

Muscle pain, muscle spasms, muscular weakness, back pain, changes in ECG (QT prolongation), upset stomach including feeling sick (nausea), rash, being sick (vomiting), swelling of the face, lips, tongue and/or throat, reduction in blood platelets (which increases risk of bleeding or bruising), diarrhoea

Reporting of side effects

If you get any side effects, talk to your doctor. This includes any possible side effects not listed in this leaflet. By reporting side effects you can help provide more information on the safety of this medicine.

5 HOW TO STORE ENZALUTAMIDE

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date which is stated on the cardboard wallet and outer carton after EXP. The expiry date refers to the last day of that month.

This medicine does not require any special storage conditions.

Do not take any soft capsule that is leaking, damaged, or shows signs of tampering.

Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.

6 CONTENTS OF THE PACK AND OTHER INFORMATION

What Enzalutamide contains

The active substance is enzalutamide.

Each soft capsule contains 40 mg of
Enzalutamide IP??????? 40mg
sorbitol??????????????????? 57.8mg
Excipients? ???????????????q.s.

  • The other ingredients of the soft capsule are caprylocaproyl macrogol-8 glycerides, butylhydroxyanisole, and butylhydroxytoluene.
  • The ingredients of the soft capsule shell are gelatin, sorbitol sorbitan solution (see section 2), glycerol, titanium dioxide, and purified water.
  • The ingredients of the ink are iron oxide black and polyvinyl acetate phthalate.
Contents of the pack
  • Enzalutamide soft capsules are white to off-white, oblong soft capsules (approximately 20 mm by 9 mm).
  • Each carton contains 112 soft capsules in 4 blister wallets of 28 soft capsules each.

7. Manufactured in India By:
TAJ PHARMACEUTICALS LIMITED
Mumbai, India
at SURVEY NO. 188/1, 190/1TO 4, ATHIYAWAD , DABHEL,
DAMAN- 396210 (INDIA)

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