Olaparib plus bevacizumab first-line maintenance in ovarian cancer: final overall survival results from the PAOLA-1/ENGOT-ov25 trial

  • PAOLA-1/ENGOT-ov25 investigators
  • , I. Ray-Coquard
  • , A. Leary
  • , S. Pignata
  • , C. Cropet
  • , A. González-Martín
  • , C. Marth
  • , S. Nagao
  • , I. Vergote
  • , N. Colombo
  • , J. Mäenpää
  • , F. Selle
  • , J. Sehouli
  • , D. Lorusso
  • , E. M. Guerra Alia
  • , G. Bogner
  • , H. Yoshida
  • , C. Lefeuvre-Plesse
  • , P. Buderath
  • , A. M. Mosconi
  • A. Lortholary, A. Burges, J. Medioni, A. El-Balat, M. Rodrigues, T. W. Park-Simon, C. Dubot, D. Denschlag, B. You, E. Pujade-Lauraine, P. Harter

Research output: Contribution to journalArticleScientificpeer-review

239 Citations (Scopus)
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Abstract

Background: In the PAOLA-1/ENGOT-ov25 primary analysis, maintenance olaparib plus bevacizumab demonstrated a significant progression-free survival (PFS) benefit in newly diagnosed advanced ovarian cancer patients in clinical response after first-line platinum-based chemotherapy plus bevacizumab, irrespective of surgical status. Prespecified, exploratory analyses by molecular biomarker status showed substantial benefit in patients with a BRCA1/BRCA2 mutation (BRCAm) or homologous recombination deficiency (HRD; BRCAm and/or genomic instability). We report the prespecified final overall survival (OS) analysis, including analyses by HRD status. Patients and methods: Patients were randomized 2 : 1 to olaparib (300 mg twice daily; up to 24 months) plus bevacizumab (15 mg/kg every 3 weeks; 15 months total) or placebo plus bevacizumab. Analysis of OS, a key secondary endpoint in hierarchical testing, was planned for ∼60% maturity or 3 years after the primary analysis. Results: After median follow-up of 61.7 and 61.9 months in the olaparib and placebo arms, respectively, median OS was 56.5 versus 51.6 months in the intention-to-treat population [hazard ratio (HR) 0.92, 95% confidence interval (CI) 0.76-1.12; P = 0.4118]. Subsequent poly(ADP-ribose) polymerase inhibitor therapy was received by 105 (19.6%) olaparib patients versus 123 (45.7%) placebo patients. In the HRD-positive population, OS was longer with olaparib plus bevacizumab (HR 0.62, 95% CI 0.45-0.85; 5-year OS rate, 65.5% versus 48.4%); at 5 years, updated PFS also showed a higher proportion of olaparib plus bevacizumab patients without relapse (HR 0.41, 95% CI 0.32-0.54; 5-year PFS rate, 46.1% versus 19.2%). Myelodysplastic syndrome, acute myeloid leukemia, aplastic anemia, and new primary malignancy incidence remained low and balanced between arms. Conclusions: Olaparib plus bevacizumab provided clinically meaningful OS improvement for first-line patients with HRD-positive ovarian cancer. These prespecified exploratory analyses demonstrated improvement despite a high proportion of patients in the placebo arm receiving poly(ADP-ribose) polymerase inhibitors after progression, confirming the combination as one of the standards of care in this setting with the potential to enhance cure.

Original languageEnglish
Pages (from-to)681-692
Number of pages12
JournalAnnals of Oncology
Volume34
Issue number8
DOIs
Publication statusPublished - Aug 2023
Publication typeA1 Journal article-refereed

Keywords

  • advanced ovarian cancer
  • bevacizumab
  • olaparib
  • overall survival

Publication forum classification

  • Publication forum level 3

ASJC Scopus subject areas

  • Hematology
  • Oncology

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