Key clinical point: This real-world study confirmed the effectiveness of tucatinib across all treatment lines in patients with human epidermal growth factor receptor 2-positive (HER2+) metastatic breast cancer (BC).
Major finding: Median real-world time-to-treatment discontinuation was 6.5 months (95% CI 5.4-8.8 months) for the overall population but was longer in patients who received tucatinib in combination with trastuzumab and capecitabine in a metastatic setting (8.1 months; 95% CI 5.7-9.5 months) or as second-line or third-line therapy (9.4 months; 95% CI 6.3-14.1 months). Median real-world overall survival was 26.6 months (95% CI 20.2-not reached).
Study details: Findings are from a retrospective cohort study including 216 patients with HER2+ metastatic BC who received tucatinib in any line of therapy.
Disclosures: This study was sponsored by Seagen Inc. and Merck Sharp & Dohme LLC. Seven authors declared being employees of and holding stock or stock options in Seagen Inc., and the other authors declared ties with various sources, including Seagen and Merck Sharp & Dohme.
Source: Kaufman PA et al. Real-world patient characteristics, treatment patterns, and clinical outcomes associated with tucatinib therapy in HER2-positive metastatic breast cancer. Front Oncol . 2023;13:1264861 (Oct 2). doi: 10.3389/fonc.2023.1264861
