Extended Data Fig. 1: Subgroup analysis: OS in the (a) overall and (b) HR+ cohorts.

CDK, cyclin-dependent kinase; CI, confidence interval; ECOG, Eastern Cooperative Oncology Group; HR, hormone receptor; IHC, immunohistochemistry; ISH, in situ hybridization; OS, overall survival; T-DXd, trastuzumab deruxtecan; TPC, treatment of physician’s choice of chemotherapy.