Statement: both cohorts of the primary trial undergo a total of 25 cycles, each lasting 5 weeks , patients receive the same types and dosages of medication throughout all 20 cycles
Primary_evidence: INTERVENTION 1:    HER2+ TC   Participants with HER2+ breast cancer received treatment as follows:   Cycles 1-3 (3-week cycles): trastuzumab 8 mg/kg, IV on Day 1 (Cycle 1 only; 6 mg/kg in Cycles 2 and 3), doxorubicin 60 mg/m^2, IV, and paclitaxel 150 mg/m^2, IV, on Day 1 followed by 2 weeks off.   Cycles 4-7 (3-week cycles): trastuzumab 6 mg/kg, IV, paclitaxel 175 mg/m^2, IV, on Day 1, followed by 2 weeks off.   Cycles 8-10 (3-week cycles): trastuzumab 6 mg/kg, IV, on Day 1 and cyclophosphamide 600 mg/m^2, IV, methotrexate 40 mg/m^2, IV, and 5-fluorouracil 600 mg/m^2, IV, (collectively CMF) on Days 1 and 8, followed by 2 weeks off.   Cycles 11-17 (3-week cycles): postoperatively, participants received trastuzumab 6 mg/kg IV on Day 1, followed by 2 weeks off for maximum of 17 overall cycles with trastuzumab. Adjuvant tamoxifen, 20 mg/day was administered for up to 5 years. INTERVENTION 2:    HER2+ C   Participants with HER2+ breast cancer received treatment as follows:   Cycles 1-3 (3-week cycles): doxorubicin 60 mg/m^2, IV and paclitaxel 150 mg/m^2, IV, on Day 1 followed by 2 weeks off.   Cycles 4-7 (3-week cycles): paclitaxel 175 mg/m^2, IV, on Day 1, followed by 2 weeks off.   Cycles 8-10 (3-week cycles): cyclophosphamide 600 mg/m^2, IV, methotrexate 40 mg/m^2, IV, and 5-fluorouracil 600 mg/m^2, IV, on Days 1 and 8, followed by 1 week off.