The American Society of Clinical Oncology reported a study of 80,000 women in 70 clinical trials. The object of the study was to determine the affect of obesity on breast cancer survival. Researchers differentiated between pre- and post-menopausal women, type of cancer (ER+ or ER-), tumor size, lymph node involvement and treatment regimens to isolate the effects of BMI on mortality. Previous studies have already linked obesity with a greater risk of developing cancer. The results showed that death rates were significantly higher for premenopausal obese women with estrogen-receoptor (ER+) breast cancer.
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