CA9 and neoplasm: Concerning the expression of GLUT1, CAIX, MCT1 and CD147, all have been significantly associated with high-grade (p < 0.001), basal-like (p < 0.001), ER and PgR negative (p < 0.05) tumors; absence of lymph node metastasis was more frequently observed in MCT1 expressing tumors (p = 0.0223) and CAIX expression was associated with an increased tumor size (p = 0.0005).