Olaparib Maintenance Therapy in Platinum-Sensitive Relapsed Ovarian Cancer

N Engl J Med. 2012 Apr 12;366(15):1382-92. doi: 10.1056/NEJMoa1105535. Epub 2012 Mar 27.

Abstract

Background: Olaparib (AZD2281) is an oral poly(adenosine diphosphate [ADP]-ribose) polymerase inhibitor that has shown antitumor activity in patients with high-grade serous ovarian cancer with or without BRCA1 or BRCA2 germline mutations.

Methods: We conducted a randomized, double-blind, placebo-controlled, phase 2 study to evaluate maintenance treatment with olaparib in patients with platinum-sensitive, relapsed, high-grade serous ovarian cancer who had received two or more platinum-based regimens and had had a partial or complete response to their most recent platinum-based regimen. Patients were randomly assigned to receive olaparib, at a dose of 400 mg twice daily, or placebo. The primary end point was progression-free survival according to the Response Evaluation Criteria in Solid Tumors guidelines.

Results: Of 265 patients who underwent randomization, 136 were assigned to the olaparib group and 129 to the placebo group. Progression-free survival was significantly longer with olaparib than with placebo (median, 8.4 months vs. 4.8 months from randomization on completion of chemotherapy; hazard ratio for progression or death, 0.35; 95% confidence interval [CI], 0.25 to 0.49; P<0.001). Subgroup analyses of progression-free survival showed that, regardless of subgroup, patients in the olaparib group had a lower risk of progression. Adverse events more commonly reported in the olaparib group than in the placebo group (by more than 10% of patients) were nausea (68% vs. 35%), fatigue (49% vs. 38%), vomiting (32% vs. 14%), and anemia (17% vs. 5%); the majority of adverse events were grade 1 or 2. An interim analysis of overall survival (38% maturity, meaning that 38% of the patients had died) showed no significant difference between groups (hazard ratio with olaparib, 0.94; 95% CI, 0.63 to 1.39; P=0.75).

Conclusions: Olaparib as maintenance treatment significantly improved progression-free survival among patients with platinum-sensitive, relapsed, high-grade serous ovarian cancer. Interim analysis showed no overall survival benefit. The toxicity profile of olaparib in this population was consistent with that in previous studies. (Funded by AstraZeneca; ClinicalTrials.gov number, NCT00753545.).

Publication types

  • Clinical Trial, Phase II
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Antineoplastic Agents / adverse effects
  • Antineoplastic Agents / therapeutic use*
  • Disease-Free Survival
  • Double-Blind Method
  • Female
  • Genes, BRCA1
  • Genes, BRCA2
  • Germ-Line Mutation
  • Humans
  • Kaplan-Meier Estimate
  • Maintenance Chemotherapy*
  • Middle Aged
  • Neoplasm Grading
  • Neoplasm Recurrence, Local / drug therapy*
  • Ovarian Neoplasms / drug therapy*
  • Ovarian Neoplasms / mortality
  • Ovarian Neoplasms / pathology
  • Phthalazines / adverse effects
  • Phthalazines / therapeutic use*
  • Piperazines / adverse effects
  • Piperazines / therapeutic use*
  • Young Adult

Substances

  • Antineoplastic Agents
  • Phthalazines
  • Piperazines
  • olaparib

Associated data

  • ClinicalTrials.gov/NCT00753545