A Study of Trastuzumab Emtansine in Combination With Atezolizumab or Placebo as a Treatment for Participants With Human Epidermal Growth Factor 2 (HER2)-Positive and Programmed Death-ligand 1 (PD-L1)-Positive Locally Advanced (LABC) or Metastatic Breast Cancer (MBC)
Status: ACTIVE_NOT_RECRUITING
Study type: INTERVENTIONAL
Conditions: Metastatic Breast Cancer
Interventions: DRUG: Trastuzumab Emtansine|DRUG: Atezolizumab|OTHER: Placebo
Sponsor: Hoffmann-La Roche