 antimicrobial exposure during curative intent treatment of triple negative breast cancer, TNBC, has been linked to poorer survival outcomes. In this study, researchers examined the association between antimicrobial use and peripheral lymphocyc count during TNBC treatment with survival. They found that each additional antimicrobial prescription was associated with worse overall and breast cancer specific survival. Additionally, this association remained even after adjusting for neutrophils, which are white blood cells that help fight infection. The authors suggest that these findings could inform future studies on the effects of antimicrobial use on TNBC survival and potentially guide clinicians when prescribing antibiotics to patients with TNBC. This article was offered by Julia D. Ransohoff, Victor Ritter, Natasha Purington, and others.