Abstract
LUCY interim findings confirmed the clinical effectiveness of olaparib 300 mg twice daily in patients with metastatic breast cancer (mBC) in a real world setting. Findings were consistent with the OlympiAD trial of olaparib vs chemotherapy of physician’s choice. We report results of the final planned analysis. Eligible adults had germline (g) or somatic (s) BRCA1- and/or BRCA2-mutated (BRCAm), HER2-negative mBC and had received taxane and/or anthracycline in early or metastatic settings and ≤2 previous lines of chemotherapy for mBC. Pts with hormone receptor-positive (HR+) mBC had previously completed ≥1 line of endocrine therapy (ET) in any setting or were unsuitable for further ET. Primary endpoint: investigator-assessed progression-free survival (PFS; gBRCAm cohort). Overall survival (OS) and safety were secondary endpoints. Final analysis was planned at 130 OS events (gBRCAm). Results are in all pts (gBRCAm and sBRCAm). Prespecified subgroups (gBRCAm only): HR status (HR+ vs triple-negative breast cancer [TNBC]); line of therapy (1st line vs 2nd line+). During 2018, 255 pts were enrolled (252 gBRCAm, 3 sBRCAm; median [m] age: 45.0 [range 22–75] years; 98.4% female). mPFS: 8.2 months (95% CI 7.0–9.2; 208 events, 81.6%). mOS: 24.9 months (95% CI 21.1–27.9; 142 events, 55.7%). OS rate at 30 months: 41.7% (95% CI 35.2–48.1). Treatment-related adverse events (AEs, >10% pts): nausea (47.8%), anaemia (34.5%), asthenia (20.8%), fatigue (18.0%), vomiting (17.6%), neutropenia (15.3%) and diarrhoea (11.0%). Grade ≥3 AEs (17.6% pts) included anaemia (11.8%). Few pts (4.3%) discontinued treatment due to an AE. Post study therapies will be reported. The benefit of olaparib was similar across HR status and treatment lines. mOS was longer than reported in OlympiAD. No new safety signals were observed. These results strongly support olaparib as a chemotherapy-free alternative for gBRCAm, HER2-negative mBC.Table: 174PSubgroup analyses (full analysis set)HR statusLine of therapyHER2-negativeHER2-negative1st line2nd line+HR+TNBCn134118136116PFSEvents, n (%)113 (84.3)94 (79.7)107 (78.7)100 (86.2)Median8.386.878.387.5995% CI7.92, 10.555.52, 9.177.20, 10.285.88, 9.07OSEvents, n (%)73 (54.5)67 (56.8)71 (52.2)69 (59.5)Median27.4321.0627.4322.7495% CI22.74, 33.4517.05, 27.3021.36, 37.4218.04, 27.20 Open table in a new tab
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