FROM THE JOURNAL OF CLINICAL ONCOLOGY
Being overweight or obese was significantly associated with a greater risk of developing cardiotoxicity among breast cancer patients treated with anthracyclines and/or trastuzumab, investigators found.
Anthracyclines, a class of anticancer agents widely used to treat many cancer types, have a known association with cardiotoxicity. Furthermore, people who are overweight or obese have an increased risk for developing cardiovascular diseases. The purpose of this study was to “explore in greater depth the influence of overweight and obesity as aggravating factors in the development of cardiotoxicity” specifically among patients who received anthracycline and/or trastuzumab as part of their cancer treatment and were therefore at increased risk of experiencing cardiac-related adverse events, wrote Charles Guenancia, MD, PhD, of University Hospital, Dijon Cedex, France, and his associates (J Clin Oncol. 2016 July 25. doi: 10.1200/JCO.2016.67.4846).
These results are from a meta-analysis of 15 published prospective or retrospective cohort studies that investigated or otherwise reported data on the association between overweight and/or obesity and cardiotoxicity resulting from anthracycline and/or trastuzumab use for treating localized or metastatic breast cancer. Together, the 15 studies represented a total of 8,745 breast cancer patients.
Overall, the mean rate of cardiotoxicity was 17% (95% confidence interval, 11%-25%). Patients treated with anthracyclines only (n = 3,898) had a mean rate of cardiotoxicity of 20% (95% CI, 5%-43%) while patients treated with trastuzumab with or without anthracyclines (n = 4,847) had a lower mean rate of cardiotoxicity at 16% (95% CI, 10%-24%).Paired meta-analysis revealed that overweight, defined as a body mass index score of 25 to 29.9, was associated with increased risk of cardiotoxicity with an odds ratio of 1.15 (95% CI, 0.83-1.58). Obesity, defined as a body mass index score of 30 or greater, was associated with a greater risk of cardiotoxicity with an odds ratio of 1.47 (95% CI, 0.95-2.28).
The association between body mass index and the risk of cardiotoxicity did not differ significantly by drug regimen (anthracyclines alone or sequential anthracyclines and trastuzumab).
This study’s funding source was not listed. Dr. Guenancia and one other investigator reported serving in advisory roles and/or receiving financial compensation from various companies.
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