Janssen seeks USFDA nod for Niraparib and Abiraterone Acetate Dual-Action Tablet, plus Prednisone to treat patients with Metastatic Castration-Resistant Prostate Cancer with BRCA Gene Mutations

Prostate cancer is one of the most common cancers in the U.S., with an estimated 268,490 new cases diagnosed in 2022. Approximately 10 to 50 percent of patients progress to mCRPC within three years of diagnosis, of which an estimated 10 to 15 percent harbor a BRCA mutation.

The combination of niraparib, a highly selective poly (ADP-ribose) polymerase (PARP) inhibitor, and abiraterone acetate, a prodrug of abiraterone, a CYP17 inhibitor, plus prednisone, targets two oncogenic drivers in patients with mCRPC: the androgen receptor axis and HRR gene alterations. The combination of niraparib with abiraterone acetate plus prednisone (AAP) is intended for patients with BRCA mutations who have not received prior treatment for mCRPC except for standard of care, next-generation androgen receptor inhibitors and up to four months of AAP. Through the DAT formulation, this therapeutic option may help improve compliance and reduce pill burden.

The NDA is supported by data from the MAGNITUDE study (NCT03748641), a Phase 3, randomized, double-blind, placebo-controlled, multicenter study evaluating the safety and efficacy of niraparib plus AAP as a first-line treatment in patients with mCRPC, with or without alterations in HRR associated genes. Patients with HRR gene alterations were randomized to receive niraparib 200 mg once daily plus AAP [n=212], or placebo plus AAP [n=211].

First results from MAGNITUDE were presented at the American Society of Clinical Oncology – Genitourinary Cancers Symposium (ASCO GU) 2022 Annual Meeting (Abstract #12) for the primary endpoint of investigator-evaluated radiographic progression-free survival (rPFS) in all HRR-positive patients, as well as patients with BRCA mutations, receiving niraparib plus AAP.5 Results from the secondary interim analysis (IA2) were presented at the ASCO GU 2023 Annual Meeting (Abstract #170). In IA2, at 26.8 months of median follow-up, researchers further reviewed time to symptomatic progression (TSP) and time-to-initiation of cytotoxic chemotherapy (TCC) in the HRR-positive population and the BRCA subgroup. The study continues to collect data on the secondary endpoints, which include TCC, TSP and overall survival.

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