A Study of Participant Satisfaction and Safety With Subcutaneously Administered Trastuzumab (Herceptin) in Participants With Human Epidermal Growth Factor Receptor 2 (HER2)-Positive Early Breast Cancer

This Phase IIIb, open-label, multinational, multicenter study will evaluate the participant's satisfaction and safety with subcutaneously administered trastuzumab in participants with HER2-positive early breast cancer. Participants will receive trastuzumab 600 milligrams (mg) administered subcutaneously every 3 weeks in the adjuvant or neo-adjuvant plus adjuvant setting for 18 cycles (1 year), unless disease progression or unacceptable toxicity occurs. The trastuzumab regimen could include mono- and/or combination therapy.