Activation of SNAT1 occurred more frequently in large breast tumors (invasion to level T3-T4) (94.4%) than in small ones (level T1-T2) (53.4%; P<0.001) and more frequently in breast cancer with regional LN metastasis (93.2%) than in N0-stage tumors (42.6%; P<0.001). Here, SLC38A1 is linked to breast carcinoma.