Lynparza demonstrated overall survival benefit in phase III PROfound trial for BRCA1/2 or ATM-mutated metastatic castration-resistant prostate cancer .- AstraZeneca + Merck Inc.

AstraZeneca and MSD Inc., announced further positive results from the Phase III PROfound trial of Lynparza (olaparib) in men with metastatic castration-resistant prostate cancer (mCRPC) who have a homologous recombination repair gene mutation (HRRm) and have progressed on prior treatment with new hormonal agent (NHA) treatments (e.g. enzalutamide and abiraterone).

Results from the trial showed a statistically significant and clinically meaningful improvement in the key secondary endpoint of overall survival (OS) with Lynparza versus enzalutamide or abiraterone in men with mCRPC selected for BRCA1/2 or ATM gene mutations, a subpopulation of HRR gene mutations. The Phase III PROfound trial had met its primary endpoint in August 2019, showing significantly improved radiographic progression-free survival (rPFS) in men with mutations in BRCA1/2 or ATM genes, and had met a key secondary endpoint of rPFS in the overall HRRm population.

Lynparza was granted Priority Review in the US for patients with HRRm mCRPC in January 2020, with regulatory reviews ongoing in the EU and other jurisdictions. AstraZeneca and MSD are exploring additional trials in prostate cancer including the ongoing Phase III PROpel trial, with first data expected in 2021, testing Lynparza as a 1st-line medicine for patients with mCRPC in combination with abiraterone acetate versus abiraterone acetate alone.

PROfound trial : PROfound is a prospective, multicentre, randomised, open-label, Phase III trial testing the efficacy and safety of Lynparza versus enzalutamide or abiraterone in patients with mCRPC who have progressed on prior treatment with NHA treatments (abiraterone or enzalutamide) and have a qualifying tumour mutation in BRCA1/2, ATM or one of 12 other genes involved in the HRR pathway. The trial was designed to analyse patients with HRRm genes in two cohorts: the primary endpoint was rPFS in those with mutations in BRCA1/2 or ATM genes and then, if Lynparza showed clinical benefit, a formal analysis was performed of the overall trial population of patients with HRRm genes (BRCA1/2, ATM, CDK12 and 11 other HRRm genes; a key secondary endpoint).