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Trastuzumab deruxtecan + capecitabine + durvalumab is an investigational combination therapy being evaluated in clinical trials for the treatment of HER2-positive and HER2-low advanced gastric, gastroesophageal junction, and breast cancer. Trastuzumab deruxtecan is an antibody-drug conjugate targeting HER2, consisting of a humanized anti-HER2 monoclonal antibody linked to a topoisomerase I inhibitor payload via a cleavable tetrapeptide linker, designed to deliver cytotoxic activity directly to HER2-expressing cancer cells. Capecitabine is an oral fluoropyrimidine carbamate that functions as a prodrug of 5-fluorouracil and disrupts DNA synthesis through inhibition of thymidylate synthase. Durvalumab is an immune checkpoint inhibitor that binds to PD-L1, preventing interaction with PD-1 and CD80, thereby promoting anti-tumor immune responses. This combination is developed for neoadjuvant, perioperative, and advanced settings to exploit synergistic cytotoxicity and immune modulation.[2][3][4][7]
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