SLC31A1 and breast cancer: The results showed that the expression of SLC31A1 was significantly positively correlated with immune markers in breast cancer, especially for STAT3 of Th17 (r = 0.382, p < 0.001), STAT1 of Th1 (r = 0.358, p < 0.001), and CCR8 of Treg (r = 0.304, p < 0.001) (Figure 7C).