Breast Cancers Diagnosed Within 10 Years of Pregnancy Have Higher Risk of Metastasis, Study Shows

Breast Cancers Diagnosed Within 10 Years of Pregnancy Have Higher Risk of Metastasis, Study Shows

Women diagnosed with breast cancer up to 10 years after giving birth have a higher risk of metastasis than childless women of the same age, a study says.

The study, "Association Between Postpartum Breast Cancer Diagnosis and Metastasis and the Clinical Features Underlying Risk," was published in JAMA Network Open. In a recent study, researchers showed that women who have had babies are significantly more likely to develop breast cancer, a risk that persists for more than 20 years. In women who develop breast cancer within five years of their last pregnancy — called postpartum breast cancer — the cancer also appears to have a worse prognosis, compared to women of the same age who never had children. These are probably associated with the tissue reorganization that occurs in the breasts after childbirth with or without breastfeeding, and evidence suggests that the increased risk remains for more than five years after childbirth. Therefore, researchers at the University of Colorado Cancer Center and Oregon Health & Science University performed a study to evaluate whether that prognosis extended to patients who had been diagnosed more than five years after giving birth. They used the Colorado Young Women's Breast Cancer Cohort to study 701 women under 45 with breast cancer stages
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