Australian Public Assessment Report for abiraterone acetate Proprietary Product Name: Zytiga Sponsor: Janssen-Cilag Pty Ltd October 2012 Therapeutic Goods Administration About the Therapeutic Goods Administration (TGA) • The Therapeutic Goods Administration (TGA) is part of the Australian Government Department of Health and Ageing, and is responsible for regulating medicines and medical devices. • TGA administers the Therapeutic Goods Act 1989 (the Act), applying a risk management approach designed to ensure therapeutic goods supplied in Australia meet acceptable standards of quality, safety and efficacy (performance), when necessary. • The work of the TGA is based on applying scientific and clinical expertise to decision- making, to ensure that the benefits to consumers outweigh any risks associated with the use of medicines and medical devices. • The TGA relies on the public, healthcare professionals and industry to report problems with medicines or medical devices. TGA investigates reports received by it to determine any necessary regulatory action. • To report a problem with a medicine or medical device, please see the information on the TGA website <www.tga.gov.au>. About AusPARs • An Australian Public Assessment Record (AusPAR) provides information about the evaluation of a prescription medicine and the considerations that led the TGA to approve or not approve a prescription medicine submission. • AusPARs are prepared and published by the TGA. • An AusPAR is prepared for submissions that relate to new chemical entities, generic medicines, major variations, and extensions of indications. • An AusPAR is a static document, in that it will provide information that relates to a submission at a particular point in time. • A new AusPAR will be developed to reflect changes to indications and/or major variations to a prescription medicine subject to evaluation by the TGA. Copyright © Commonwealth of Australia 2012 This work is copyright. 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AusPAR Zytiga Janssen-Cilag Pty Ltd PM-2010-03604-3-4 Page 2 of 113 Final 4 October 2012 Therapeutic Goods Administration Contents I. Introduction to product submission _____________________________________ 4 Submission details ____________________________________________________________________ 4 Product background __________________________________________________________________ 4 Regulatory status _____________________________________________________________________ 5 Product Information__________________________________________________________________ 5 II. Quality findings _____________________________________________________________ 5 Drug substance (active ingredient) _________________________________________________ 5 Drug product __________________________________________________________________________ 6 Biopharmaceutics ____________________________________________________________________ 6 Advisory committee considerations ________________________________________________ 8 Quality summary and conclusions __________________________________________________ 8 III. Nonclinical findings _______________________________________________________ 9 Pharmacodynamics___________________________________________________________________ 9 Pharmacokinetics ____________________________________________________________________ 13 Toxicology ____________________________________________________________________________ 14 Nonclinical summary and conclusions _____________________________________________ 20 IV. Clinical findings __________________________________________________________ 24 Pharmokinetics ______________________________________________________________________ 25 Pharmacodynamics__________________________________________________________________ 48 Dosage selection for the pivotal studies ___________________________________________ 55 Efficacy _______________________________________________________________________________ 57 Safety _________________________________________________________________________________ 80 Preliminary benefit-risk assessment _______________________________________________ 99 List of questions ___________________________________________________________________ 102 V. Pharmacovigilance findings ___________________________________________105 Risk management plan ____________________________________________________________ 105 Safety specification ________________________________________________________________ 105 VI. Overall conclusion and risk/benefit assessment _________________107 Quality ______________________________________________________________________________ 107 Nonclinical _________________________________________________________________________ 108 Clinical ______________________________________________________________________________ 108 Risk management plan ____________________________________________________________ 110 Risk-benefit analysis ______________________________________________________________ 111 Outcome ____________________________________________________________________________ 112 Attachment 1. Product Information ___________________________________112 AusPAR Zytiga Janssen-Cilag Pty Ltd PM-2010-03604-3-4 Page 3 of 113 Final 4 October 2012 Therapeutic Goods Administration I. Introduction to product submission Submission details Type of Submission New Chemical Entity Decision: Approved Date of Decision: 27 February 2012 Active ingredient(s): Abiraterone acetate Product Name(s): Zytiga Sponsor’s Name and Address: Janssen-Cilag Pty Ltd 1-5 Khartoum Road Macquarie Park NSW 2113 Dose form(s): Uncoated tablet Strength(s): 250 mg Container(s): HDPE (high density polyethylene) bottle Pack size(s): 120 tablets Approved Therapeutic use: Zytiga is indicated with prednisone or prednisolone for the treatment of metastatic advanced prostate cancer (castration resistant prostatic cancer [mCRPC]) in patients who have received prior chemotherapy containing a taxane. Route(s) of administration: Oral Dosage: 1 g daily (4 tablets) ARTG Number (s) AUST R 180314 Product background This AusPAR describes an application by the sponsor, Janssen-Cilag Pty Ltd, to register a new chemical entity, abiraterone acetate (Zytiga) 250 mg tablets for the treatment of metastatic castration resistant prostatic cancer (mCRPC) after failure of taxane chemotherapy. Abiraterone acetate is - hydroxylase/C17,20-lyase (CYP17), which is required for androgen biosynthesis in the testes and adrenal gland,a selective and also inhibitor in cancerous of the prostate enzyme tissue. cytochrome There areP450 currently 17α no selective inhibitors of CYP17 on the Australian Register of Therapeutic Goods (ARTG); abiraterone acetate is the first agent in this class. Deprivation of androgen is an established method for treatment of mCRPC. Current androgen deprivation treatments for prostate cancer include orchidectomy and gonadotrophin releasing hormone (GnRH) agonists and antagonists. These treatments interrupt androgen production from the testes only. AusPAR Zytiga Janssen-Cilag Pty Ltd PM-2010-03604-3-4 Page 4 of 113 Final 4 October 2012 Therapeutic Goods Administration Docetaxel is currently approved for the treatment of patients with androgen independent (hormone refractory) prostate cancer; it was registered in 2005 by the Australian Drug Evaluation Committee (ADEC) for the first line treatment of hormone resistant prostate cancer. The submission which resulted in the approval of docetaxel for this indication could be considered to be a ‘related submission’ to the current submission to register abiraterone acetate. For the second line treatment of hormone refractory metastatic prostate cancer after failure of docetaxel, cabazitaxel (Jevtana) was approved in December 2011 following consideration by the Advisory Committee on Prescription Medicines (ACPM). Regulatory status The overseas regulatory status at the date of the application is summarised in Table 1. Table 1: Summary of international regulatory status of Zytiga. Product Information The approved product information (PI) current at the time this AusPAR was prepared can be found as Attachment 1. II. Quality findings Drug substance (active ingredient) Abiraterone acetate is a semisynthetic steroid with multiple chiral centres (Figure 1), all of which are controlled so that abiraterone acetate is a single stereoisomer. It is basic (pKa 5.19), but aqueous solubility is very low (maximum solubility is in acid, for example, 0.01 g in 100 mL in 0.1 N HCl, so that 250 mg would dissolve in 2.3L acid; 1 g in 9L). AusPAR Zytiga Janssen-Cilag Pty Ltd PM-2010-03604-3-4 Page 5 of 113 Final 4 October 2012 Therapeutic Goods Administration Figure 1: Chemical structure and molecular