Docetaxel will be administered as per local prescribing information.
Paclitaxel will be administered as per local prescribing information.
Pertuzumab will be administered intravenously at a dose of 420 milligrams (mg) no more frequently than every 3 weeks (Q3W) (or as directed in the parent study protocol if less than Q3W).
Trastuzumab will be administered as per local prescribing information.
Trastuzumab Emtansine
Droga
Trastuzumab emtansine will be administered as intravenous (IV) infusion. Participants on weekly dosing schedule of trastuzumab emtansine in parent study, may switch to Q3W schedule as per the clinical judgment of the investigator. The starting dose of Q3W schedule must not exceed 3.6 milligrams per kilograms (mg/kg).
Atezolizumab will be administered at a dose of 1200 mg by IV infusion every three weeks (Q3W)