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Continue to Chathttps://forschung.kssg.ch/de/publikationen/3333-combination-of-trastuzumab-and-letrozole-after-resistance-to-sequential-trastuzumab-and-aromatase-inhibitor-monotherapies-in-patients-with-estrogen-receptor-positive-her-2-positive-advanced-breast-cancer-a-proof-of-concept-trial-sakk-2303