504
Participants
Start Date
May 1, 2025
Primary Completion Date
May 31, 2029
Study Completion Date
May 31, 2029
Trastuzumab deruxtecan (T-DXd)
Trastuzumab deruxtexan every three weeks
Ribociclib with ET
Ribociclib with endocrine therapy
Abemaciclib with ET
Abemaciclib with endocrine therapy
Danish Breast Cancer Cooperative Group
OTHER