CD8A and breast cancer: It was positively related to the infiltration of T helper cells, CD8+ T cells, T cells, mast cells, B cells, iDC, TFH, cytotoxic cells, neutrophils, Tcm, Th1 cells, DC, Tem, macrophages, eosinophils, NK CD56bright cells, pDC, aDC, NK cells, TReg, Tgd and Th17 cells in breast cancer (Figure 5C, p < 0.05).