Multiple cutaneous nevi (moles) may reflect plasma hormone levels and predict breast cancer risk independently, a prospective cohort study found after following 74,523 white females for 24 years (1986–2010) in the US. The number of cutaneous nevi was associated with increased risk of breast cancer only among estrogen receptor (ER)–positive tumors. Source: http://www.plosmedicine.org/
Another prospective cohort study concluded that higher red meat intake in early adulthood may be a risk factor for breast cancer, and replacing red meat with a combination of legumes, poultry, nuts and fish may reduce the risk of breast cancer. The study included 88,803 premenopausal women in the US and followed 20 years. Source: http://www.bmj.com/美国一项包括74,523名白人女性的前瞻性研究经随访24年（1986-2010）之后发现，多发性皮肤痣可能反映了血浆激素水平并独立预测乳腺癌的风险。痣的数量只与雌激素受体（ER）阳性乳腺癌的风险增加有关。来源：http://www.plosmedicine.org/
另一项前瞻性研究得出的结论是在成年早期较高的红肉摄入量可能是乳腺癌的危险因素，以豆类，家禽，坚果和鱼的组合代替红肉可以减少患乳腺癌的风险。该项美国研究包括88803名绝经前妇女并经随访20年。来源：http://www.bmj.com/