A Study of Trastuzumab Emtansine in Comparison With Treatment of Physician's Choice in Participants With HER2-positive Breast Cancer Who Have Received at Least Two Prior Regimens of HER2-directed Therapy
Conditions
Interventions
- DRUG: Trastuzumab emtansine
- DRUG: Treatment of physician's choice
Sponsor
Hoffmann-La Roche