Olaparib Maintenance Treatment Versus Placebo in Patients With PSR Ovarian Cancer Who Are in CR or PR to Platinum-based Chemotherapy and Whose Tumours Carry sBRCAm or HRR-associated Genes Mutations

• Progression Free Survival (PFS) using modified RECIST 1.1 in the cohort of patients with sBRCA ovarian cancer
  

• Progression Free Survival (PFS) using modified RECIST 1.1. in the Intent to Treat Population (ITT) consisting of all randomised patients with sBRCAm or HRR-associated gene mutations
• Overall Survival (OS) in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients
• Time from randomisation to first subsequent therapy or death (TFST) in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients
• Trial outcome index (TOI) of the Functional Assessment of Cancer Therapy - Ovarian (FACT-O) in sBRCA and HRR associated gene mutated relapsed ovarian cancer patients who are in complete or partial response following platinum based chemotherapy
• Plasma mutation status
• Time to earliest progression by RECIST 1.1 or CA-125 or Death in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients
• Time from randomisation to second progression (PFS2) in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients
• Time from randomisation to second subsequent therapy or death (TSST) in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients
• Time from randomisation to study treatment discontinuation or death (TDT) in patients with sBRCAm ovarian cancer and in the ITT population consisting of all randomised patients

• Number of AEs in all patients who received at least one dose of randomised investigational product, olaparib or placebo
• Changes in Vital signs in all patients who received at least one dose of randomised investigational product, olaparib or placebo
• Changes in Physical examination results in all patients who received at least one dose of randomised investigational product, olaparib or placebo
• Changes in safety laboratory parameters in all patients who received at least one dose of randomised investigational product, olaparib or placebo

This is a phase III, randomised, double-blind, placebo-controlled, multi-centre study to assess the efficacy of olaparib maintenance monotherapy in relapsed high grade epithelial ovarian cancer patients (including patients with primary peritoneal and / or fallopian tube cancer) who have responded following platinum based chemotherapy. The study population will be enrolled as two separate cohorts that will enrol simultaneously. The confirmatory cohort will consist of patients who carry a somatic BRCA mutation (documented mutation in BRCA1 or BRCA2 that is predicted to be deleterious or suspected deleterious) which are detected in tumour material but absent from germline blood testing ; the exploratory cohort will include patients with a mutation (documented mutation predicted to be deleterious or suspected deleterious) in non BRCA HRR-associated genes which are detected in tumour material regardless of their germline status.