This two-arm, randomized, open-label, multicenter study will evaluate the efficacy and safety of Kadcyla (trastuzumab emtansine, also known as T-DM1) in combination with Perjeta (pertuzumab) versus Herceptin (trastuzumab) in combination with Perjeta and a taxane as adjuvant therapy in patients with HER2-positive primary invasive breast cancer. Following surgery and anthracycline-based chemotherapy, patients will receive either Kadcyla 3.6 mg/kg and Perjeta 420 mg intravenously (iv) every three weeks or Herceptin 6 mg/kg iv every three weeks in combination with Perjeta and a taxane. Anticipated time on HER2 targeted study treatment is up to 1 year.
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