Increased Risk of Breast Cancer after Recent Childbirth

February 23rd, 2019

In a large International Premenopausal Breast Cancer study which included close to 900,000 women, compared with nulliparous women, parous women had an increased risk for breast cancer that peaked about 5 years after childbirth and then gradually decreased about 24 years after childbirth.The increase in breast cancer risk after childbirth may be due to proliferation of breast cells during pregnancy which could promote accelerated development of latent initiated tumor cells. Childbirth also brings about maternal changes beyond breast tissue including altered immune function and microbiota, increased stress, and accelerated aging processes. Health Care Professionals should take these factors into account when considering individual risk profiles for breast cancer in premenopausal women.