The effect of PARP inhibitors in homologous recombination proficient ovarian cancer: meta-analysis
BRCA1/2 mutations and homologous recombination deficiency (HRD) predispose to increased sensitivity to poly(ADP-ribose)polymerase (PARP) inhibitor treatment. Our aim was to evaluate the PARP inhibitors effect on progression free survival (PFS) in a subpopulation with homologous recombination proficient status (HRD-BRCA-). A systematic literature search was performed for all studies reporting on the effect of PARP inhibitors regarding PFS in the HRD-BRCA- subpopulation, in patients with epithelial ovarian, tubal or primary peritoneal cancers (EOC). Five studies were included, enrolling a population of 3413 patients, with 1070 of them being HRD-BRCA-. PARP inhibitors were effective in the treatment of EOC, regardless of HRD and BRCA status or line of therapy. The estimated pooled effect hazard ratio (HR), assessing PFS for PARP inhibitors compared with control, was 0.76 (95% CI: 0.65-0.88,