A recent phase Ib/II trial evaluated the combination of tucatinib, letrozole, and palbociclib in patients with HR+/HER2+ metastatic breast cancer, demonstrating a manageable safety profile and encouraging efficacy data. An all-oral, chemotherapy-free regimen is an appealing strategy, and could be a possible maintenance or primary therapy option in select patients.

See related article by Shagisultanova et al., p. 5021

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