Pooja P Advani1, Karla V Ballman1, Travis J Dockter1, Gerardo Colon-Otero1, Edith A Perez2. 1. Pooja P. Advani, Gerardo Colon-Otero, and Edith A. Perez, Mayo Clinic, Jacksonville, FL; and Karla V. Ballman and Travis J. Dockter, Mayo Clinic, Rochester, MN. 2. Pooja P. Advani, Gerardo Colon-Otero, and Edith A. Perez, Mayo Clinic, Jacksonville, FL; and Karla V. Ballman and Travis J. Dockter, Mayo Clinic, Rochester, MN. perez.edith@mayo.edu.
Abstract
PURPOSE: Significant improvement in survival outcomes has been established with the addition of trastuzumab to adjuvant chemotherapy for human epidermal growth factor receptor 2 (HER2) -positive early breast cancer treatment. However, trastuzumab may increase the risk of cardiac toxicity, and long-term evaluation of its incidence and risk factors are warranted. METHODS: NCCTG (Alliance) N9831 trial compared adjuvant doxorubicin and cyclophosphamide (AC) followed by either weekly paclitaxel (arm A); paclitaxel then trastuzumab (arm B); or paclitaxel plus trastuzumab followed by trastuzumab alone (arm C) in patients with HER2-positive breast cancer. Cumulative incidence of cardiac events (CE) and left ventricular ejection fraction (LVEF) were evaluated in 1,944 women who proceeded to post-AC therapy. Risk factors for trastuzumab-induced cardiac toxicity were identified by Cox regression models. RESULTS: The 6-year cumulative incidence of CE was 0.6% in arm A, 2.8% in arm B, and 3.4% in arm C. At a median follow-up of 9.2 years, only two additional CHF diagnoses (of 1,046 patients) occurred beyond our previously reported follow-up time of 3.75 years. LVEF recovered in the majority of the patients who developed CHF. There were two cardiac deaths in arm A and one each in arms B and C. Age of 60 years or older, registration LVEF less than 65%, and use of antihypertensive medications were associated with an increased risk of CE in arms B and C. CONCLUSION: The cumulative incidence of CE at 6 years was slightly higher with the addition of trastuzumab; however, the late development of CE is infrequent. Trastuzumab (in the context of anthracycline- and taxane-based therapy) continues to have a favorable benefit-risk ratio.
RCT Entities:
PURPOSE: Significant improvement in survival outcomes has been established with the addition of trastuzumab to adjuvant chemotherapy for human epidermal growth factor receptor 2 (HER2) -positive early breast cancer treatment. However, trastuzumab may increase the risk of cardiac toxicity, and long-term evaluation of its incidence and risk factors are warranted. METHODS: NCCTG (Alliance) N9831 trial compared adjuvant doxorubicin and cyclophosphamide (AC) followed by either weekly paclitaxel (arm A); paclitaxel then trastuzumab (arm B); or paclitaxel plus trastuzumab followed by trastuzumab alone (arm C) in patients with HER2-positive breast cancer. Cumulative incidence of cardiac events (CE) and left ventricular ejection fraction (LVEF) were evaluated in 1,944 women who proceeded to post-AC therapy. Risk factors for trastuzumab-induced cardiac toxicity were identified by Cox regression models. RESULTS: The 6-year cumulative incidence of CE was 0.6% in arm A, 2.8% in arm B, and 3.4% in arm C. At a median follow-up of 9.2 years, only two additional CHF diagnoses (of 1,046 patients) occurred beyond our previously reported follow-up time of 3.75 years. LVEF recovered in the majority of the patients who developed CHF. There were two cardiac deaths in arm A and one each in arms B and C. Age of 60 years or older, registration LVEF less than 65%, and use of antihypertensive medications were associated with an increased risk of CE in arms B and C. CONCLUSION: The cumulative incidence of CE at 6 years was slightly higher with the addition of trastuzumab; however, the late development of CE is infrequent. Trastuzumab (in the context of anthracycline- and taxane-based therapy) continues to have a favorable benefit-risk ratio.
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