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**Trastuzumab deruxtecan + capecitabine** is a combination of two anti-cancer drugs used in investigational regimens for advanced or metastatic breast cancer. **Trastuzumab deruxtecan** is an antibody-drug conjugate (ADC), composed of the anti-HER2 monoclonal antibody trastuzumab covalently linked to the topoisomerase I inhibitor deruxtecan, which targets HER2 receptors on tumor cells to deliver a cytotoxic agent directly and induce cell death by DNA damage. **Capecitabine** is an orally administered small-molecule prodrug of 5-fluorouracil (5-FU), a cytotoxic antimetabolite that inhibits DNA synthesis by blocking thymidylate synthase. This combination is under investigation for hormone receptor–positive or negative, HER2-low or HER2-positive metastatic breast cancer.
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