EPCAM and neoplasm: However, the cell surface antigen EpCAM, in combination with CD49f (reported originally by Lim et al [40] as a means to separate human tumor cells), provided robust discrimination (for at least 6 separate tumors, Fig. 3B and S5A; luminal cells are EpCAMhiCD49lo and basal cells are EpCAMloCD49hi).