alexa Long-term cardiac tolerability of trastuzumab in metastatic breast cancer: the M.D. Anderson Cancer Center experience.
Clinical Sciences

Clinical Sciences

Cardiovascular Pharmacology: Open Access

Author(s): Guarneri V, Lenihan DJ, Valero V, Durand JB, Broglio K, , Guarneri V, Lenihan DJ, Valero V, Durand JB, Broglio K,

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Abstract PURPOSE: To evaluate the cardiac safety of long-term trastuzumab therapy in patients with human epidermal growth receptor 2 (HER2) -overexpressing metastatic breast cancer (MBC) treated at The University of Texas M.D. Anderson Cancer Center (Houston, TX). PATIENTS AND METHODS: Among 218 MBC patients treated with trastuzumab-based therapy for at least 1 year, 173 patients were assessable for cardiac toxicity. Cardiac events (CEs) were defined as follows: asymptomatic decrease of left ventricular ejection fraction (LVEF) below 50\%; decrease of 20 percentage points in LVEF compared with the baseline; or signs or symptoms of congestive heart failure (CHF). RESULTS: The median cumulative time for trastuzumab administration was 21.3 months. The median follow-up was 32.6 months (range, 11.8 to 79.0 months). Forty-nine patients (28\%) experienced a CE: three patients (1.7\%) had an asymptomatic decrease in the LVEF of 20 percentage points, 27 patients (15.6\%) experienced grade 2 cardiac toxicity, and 19 patients (10.9\%) experienced grade 3 cardiac toxicity. All but three patients had improved LVEF or symptoms of CHF with trastuzumab discontinuation and appropriate therapy. There was one cardiac-related death (0.5\%). Baseline LVEF was significantly associated with CE (hazard ratio, 0.94; P = .001). The hazard of a CE among patients taking concomitant taxanes was higher early in the follow-up period but declined during the course of follow-up. CONCLUSION: The risk of cardiac toxicity of long-term trastuzumab-based therapy is acceptable in this population, and this toxicity is reversible in the majority of the patients. In patients who have experienced a CE, additional treatment with trastuzumab can be considered after recovery of cardiac function. This article was published in J Clin Oncol and referenced in Cardiovascular Pharmacology: Open Access

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