Phase III TROPiCS-02 study of Trodelvy shows improved OS in HR+/HER2- metastatic breast cancer

In this exploratory analysis, Trodelvy demonstrated a clinically meaningful improvement in median OS benefit compared to TPC (median OS: 14.5 months vs. 11.2 months; hazard ratio (HR): 0.79; [95% CI: 0.65-0.95]; nominal p=0.0133).

Progression-free survival (PFS) rates for Trodelvy vs. TPC were consistently higher at landmark milestones of 6, 12 and 18 months (45.6% vs. 29.4%, 21.7% vs. 8.4% and 14.4 vs. 4.7%, respectively). Similarly, OS rates for Trodelvy vs. TPC were consistently higher at landmark milestones of 12, 18, and 24 months (60.9% vs. 47.1%, 39.2% vs. 31.7%, and 25.7% vs. 21.1%, respectively). Ninety-two percent of patients in TROPiCS-02 were also eligible for evaluation of OS by HER2 status, as measured by immunohistochemistry (HER2 IHC0, n=217; HER2-low, n=283). Patients treated with Trodelvy demonstrated improved OS versus TPC in both the HER2 IHC0 (median OS: 13.6 months vs. 10.8 months; HR: 0.85 [95% CI: 0.63-1.14]) and HER2-low groups (median OS: 15.4 vs. 11.5 months; HR: 0.75 [95% CI: 0.57-0.97]).

In TROPiCS-02, the most common grade at least 3 treatment emergent adverse events were neutropenia (52%), diarrhea (10%) and fatigue (6%) in the Trodelvy arm, and neutropenia (39%), thrombocytopenia (4%), fatigue (4%) and dyspnea (4%) for those treated with TPC. No new safety signals were identified. These findings will be shared as an oral presentation at the 2023 American Society of Clinical Oncology (ASCO) Annual Meeting (Abstract #1003).