Extended Breastfeeding May Lower Risk of Certain Aggressive Breast Cancers

Recent research indicates that longer breastfeeding durations and later age at first childbirth are associated with reduced risk factors for triple negative breast cancer (TNBC), a particularly aggressive form of breast cancer. The study, published online on May 7 in npj Breast Cancer, highlights significant racial disparities and emphasizes the importance of public health policies that support breastfeeding.

Shorter durations of breastfeeding and younger age at first birth are linked to higher incidences of TNBC, with notable differences observed among various racial groups. Researchers from Yale University, led by Dr. Rachel Jaber Chehayeb, analyzed data to quantify how breastfeeding duration and age at first birth contribute to disparities in TNBC prevalence. They calculated the population-attributable fraction (PAF), finding that breastfeeding for less than six months accounts for 12% of TNBC cases among White women and 15% among Black women.

The findings suggest that policy measures promoting longer breastfeeding and addressing structural barriers can play a vital role in reducing the overall incidence of TNBC and narrowing racial disparities. Enhancing awareness of the protective benefits of breastfeeding, reforming workplace policies, and countering aggressive marketing from formula companies could encourage longer breastfeeding periods, ultimately leading to healthier populations.

The authors advocate for a cultural shift and supportive policies to increase breastfeeding rates, which could significantly impact breast cancer prevention efforts. The study underscores the critical role of public health initiatives in combating racial disparities and improving outcomes related to triple negative breast cancer.

For more detailed information, consult the original publication in npj Breast Cancer (DOI: 10.1038/s41523-025-00755-6).