PARP inhibition with olaparib and talazoparib for HER2-negative advanced breast cancer—Results from the prospective PRAEGNANT registry

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Germline BRCA1 and BRCA2 mutations enable targeted therapies in human epidermal growth factor receptor 2 (HER2)-negative advanced breast cancer (ABC). The two poly (adenosine diphosphate-ribose) polymerase (PARP) inhibitors olaparib and talazoparib were introduced into clinical practice in 2018. Limited evidence about their routine clinical use highlights the importance of this analysis. We provide a real-world analysis for PARP-inhibitor use in ABC patients treated within the prospective German PRAEGNANT registry (NCT02338167). 152 patients with ABC receiving a PARP-inhibitor were included. Real-world progression-free survival (rwPFS) and real-world overall survival (rwOS) were calculated for all patients using the Kaplan-Meier method. Subgroups (line of therapy, metastasis timing, hormone receptor (HR) status, treatment: olaparib, talazoparib, among others), germline BRCA1, BRCA2 and PALB2 mutations and adverse events (AEs) were analyzed. The median rwPFS was 6.2 months (95% CI, 4.8-7.9) and the median rwOS was 17.1 months (95% CI, 14.4-22.3). Line of therapy, HR status and treatment (olaparib versus talazoparib) appeared to especially affect both rwPFS and rwOS. Among patients with a reported germline mutation, 36.1% had a BRCA1, 62.9% a BRCA2 and 1.0% a PALB2 mutation. In summary, outcomes were comparable to those reported in pivotal trials despite later-line use of PARP-inhibitors in this analysis.

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