Real‐world effectiveness and safety of sacituzumab govitecan in patients with metastatic or unresectable locally advanced triple‐negative breast cancer: A multicenter study by the Turkish Oncology Group

Sacituzumab govitecan (SG) is an antibody-drug conjugate approved for metastatic or unresectable locally advanced triple-negative breast cancer (mTNBC) after at least two prior systemic therapies, yet real-world evidence remains limited. We conducted a retrospective, multicenter study including 285 patients with unresectable locally advanced or metastatic TNBC treated with SG across 52 oncology centers in Turkey. Median progression-free and overall survival were 5.4 months (95% confidence interval [CI], 4.6-6.2) and 12.2 months (95% CI, 10.5-13.9), respectively, with a 12-month overall survival rate of 49.2%. The objective response rate and disease control rate in evaluable patients were 36.8% and 63.9%. Grades 3-4 adverse events, mainly neutropenia, occurred in 44.2% of patients. Dose reductions were needed in 20% of cases; no treatment-related deaths were reported. Our large real-world cohort reinforces the effectiveness and manageable safety profile of SG, mirroring pivotal trials, and highlights its value as a therapeutic option in diverse and heavily pretreated mTNBC populations.