An Observational Time and Motion Study of Trastuzumab Subcutaneous (SC) and Intravenous (IV) Formulations in Human Epidermal Growth Factor Receptor 2 (HER2)-Positive Early Breast Cancer (EBC)

Trastuzumab will be given on Day 1 of each 3-week cycle for a total of 18 cycles. Dosage will be according to the local labeling: 600 milligrams (mg) SC or 6 milligrams per kilogram (mg/kg) via IV infusion. For those assigned to the IV arm or if IV treatment is delayed \>1 week, an initial loading/reloading dose of 8 mg/kg will be given instead. Due to the observational nature of this study, trastuzumab is not an investigational product but will be supplied in the MO22982 trial. Each route/device (SC single-use injection device, SC vial/syringe, IV infusion) will be observed in at least 12 episodes of care.