Breast Cancer Risk Appears to Be Higher in Women Who Have Had Babies, Study Shows

Breast Cancer Risk Appears to Be Higher in Women Who Have Had Babies, Study Shows
Women who have given birth have a higher risk of developing breast cancer, a risk that can persist for more than 20 years after childbirth, compared with women of the same age who never had a child, a study finds. The study, "Breast Cancer Risk After Recent Childbirth: A Pooled Analysis of 15 Prospective Studies," were published in Annals of Internal Medicine. Childbirth is widely recognized as protective against breast cancer. However, previous studies have shown that breast cancer risk may increase shortly after a woman has given birth, especially in women who have their first child when they are older. According to this research, the increased risk can last 10 years or longer. At this point, it is still unclear whether this greater risk might also be influenced by breastfeeding, family history of breast cancer, or even the type of tumor. In this study, researchers pooled data from 15 prospective cohort studies to assess breast cancer risk shortly after childbirth. These studies, part of the Premenopausal Breast Cancer Collaborative Group — a collaborative project of 20 prospective cohort studies — contained the medical records of women younger than 55 who had not been diagnosed with breast cancer before enrollment. During an
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