Participant Preference of Subcutaneous (SC) Versus Intravenous (IV) Herceptin (Trastuzumab) in Human Epidermal Growth Factor Receptor (HER) 2-Positive Early Breast Cancer

Herceptin will be given on Day 1 of each 3-week cycle for a total of 18 cycles. If study treatment for Cycle 1 is IV Herceptin, the initial dose will be a loading dose of 8 milligrams per kilogram (mg/kg) for de novo participants who start Herceptin treatment in the study. For all other cycles where IV Herceptin is given and for non-de novo participants, the dose will be 6 mg/kg. The SC dose will be 600 milligrams (mg) for both the SID and vial formulations for all cycles where SC Herceptin is given.

Herceptin will be given on Day 1 of each 3-week cycle for a total of 18 cycles. If study treatment for Cycle 1 is IV Herceptin, the initial dose will be a loading dose of 8 mg/kg for de novo participants who start Herceptin treatment in the study. For all other cycles where IV Herceptin is given and for non-de novo participants, the dose will be 6 mg/kg. The SC dose will be 600 mg for both the SID and vial formulations for all cycles where SC Herceptin is given.

The SID will be used, containing Herceptin 600 mg per 5 milliliters (mL).

The SID will be used, containing Herceptin 600 mg per 5 mL.