Obesity and breast cancer

Several studies mentioned correlation between obesity and increased risks for breast cancer (especially for postmenopausal women). Researchers mentioned that increased risks for postmenopausal women were noted in women with BMI equal to 35 and/or higher.
Obesity during postmenopausal period increases the breast cancer risks up to 30-60% (comparing with thin postmenopausal women). Scientists highlight that it is more important for women with hormone-sensitive types of breast cancer (for tumors that express both estrogen and progesterone receptors). At the same time, overweight and obesity cannot be risk factors for other types of breast cancer (tumors with negative hormone receptors).
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