Women who have had children (parous women) appear to have an increased risk of developing estrogen receptor-negative breast cancer, the subtype that carries a higher mortality rate and is more common in women of African ancestry.

A similar relationship was found for triple-negative breast cancer. However, the association between childbearing and increased risk of estrogen receptor-negative and triple-negative breast cancer was largely confined to the women who had never breastfed. These findings, published in the Journal of the National Cancer Institute, suggest that low rates of breastfeeding in African American women may contribute to their higher incidence of the more aggressive and difficult-to-treat subtypes of breast cancer.

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