We assessed the capacity of Staphylococcus aureus (ATCC 25923) to internalize into a panel of triple-negative breast cancer (TNBC) cell lines representing the most prevalent molecular subtypes, as classified by Lehmann et al. (2011): MDA-MB-468 (basal-like 1), MDA-MB-231 and Hs578T (mesenchymal stem-like), BT-549 and CAL-51 (mesenchymal) and MDA-MB-453 (luminal androgen receptor) [2]. Here, AR is linked to triple-negative breast carcinoma.