We found that eIF4E1 (also named eIF4E), but not eIF4E2, eIF4G1, eIF1A, eIF2α, or eIF5, is significantly increased in BCSCs, in comparison to SKBR-3, MCF-7 and MDA-MB-231 breast cancer cells and non-BCSCs of HMLER (CD44high/CD24low)SA cells (Fig.1A). Here, EIF4G1 is linked to breast cancer.