SELPLG and breast cancer: Breast cancer cells express multiple types of CAM, including PSGL-1, CD24, sLex, MUC1, CD 44, MUC1, LFA-1 (integrin αLβ2), VLA-4 (integrin α4β1), and ALCAM, whereas melanoma and lung cancer have limited CAM expression [28,29,30,33,34].