Antibiotics and Breast Cancer

In 2004, the Journal of the American Medical Association published a study suggesting an increased risk of breast cancer in women exposed to
antibiotics.

In 2009, the journal Pharmacoepidemiology and Drug Safety, published a meta-analysis looking at “ever” use of antibiotics versus “never” use of
antibiotics. In this group of studies, over 13,000 women with breast cancer and 73,000 women who did not have breast cancer were interviewed
regarding their use of antibiotics at any point in their lives. There was a 17% increased risk of breast cancer in those exposed to antibiotics at any
point in their lives.

A more recent Harvard University study published in the journal Gut in April 2017, studied over 16,642 women who had used antibiotics long term (2
or more months) and followed them for 6 years until they had a colonoscopy in 2010. Of the 16,642 women, 1195 were diagnosed with colorectal
adenoma (a colon cancer precursor). That’s 1 out of every 14 women!



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