This two-arm, randomized, open-label, multicenter study will evaluate the efficacy and safety of trastuzumab emtansine in combination with pertuzumab versus trastuzumab in combination with pertuzumab and a taxane as adjuvant therapy in participants with human epidermal growth (HER) factor 2 (HER2)-positive primary invasive breast cancer. Following surgery and anthracycline-based chemotherapy, participants will receive either trastuzumab emtansine at a dose of 3.6 milligrams per kilogram (mg/kg) and pertuzumab at a dose of 420 milligrams (mg) intravenously (IV) every 3 weeks (q3w) or trastuzumab at a dose of 6 mg/kg and pertuzumab at a dose of 420 mg IV q3w in combination with a taxane.
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Invasive Disease-Free Survival (IDFS) in the Node-Positive Subpopulation
Timeframe: Last participant randomized to data cut-off date of 27 November 2019 (approximately 70 months). The 3 year IDFS event-free rate was assessed based on the data collected for each participant considering the cut-off date mentioned above.
Invasive Disease-Free Survival (IDFS) in the Overall Population
Timeframe: First participant randomized up to approximately 7.5 years