ITGA6 and breast neoplasm: Two cell surface markers (EpCAM-Pecy7 and CD49f-APC) were used to identify 2 cell subsets using FACS, namely, basal/stem cells (TICs, CD49fhighEpCAMlow, approximately 57.6 %) and luminal cells (NTCs, CD49flowEpCAMhigh, approximately 34.1 %) in primary breast tumor (Figure 1A), as reported in a previous study [19].