Caris Life Sciences Identifies Key Resistance Mechanisms to Trastuzumab Deruxtecan in Metastatic Breast Cancer

Reuters
2026.01.28 13:31
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Caris Life Sciences Inc. has published a study in Nature’s npj Breast Cancer journal on resistance mechanisms to trastuzumab deruxtecan (T-DXd) in metastatic breast cancer. Analyzing data from 2,799 patients, the study identified ERBB2 (HER2) and ABCC1 as key predictors of survival. Higher ERBB2 expression linked to better outcomes, while higher ABCC1 correlated with worse outcomes. The research also noted increased ABCC1 and mutations in ERBB2, NFE2L2, KEAP1, and TOP1 in post-treatment samples, indicating potential acquired resistance pathways. The study's findings are already published.