MCTS1 and breast carcinoma: In overall breast cancers, MCT-1 expression was more positively associated with IL-6 (r = 0.43, p < 0.001) than with CXCL7 (r = 0.2, p = 0.02) and PD-L1 (r = 0.26, p = 0.003) (Figure 7B).