CD8A and breast cancer: After comparing the fractions of 10 different immune cells (B cells, Macrophages M1, Macrophages M2, Monocytes, Neutrophils, Natural Killer (NK) cells, T cells CD4, T cells CD8, Tregs and dendritic cells) between tumors and matched histologically normal tissues, we found that the fractions of NK cells were significantly increased in both breast cancer subtypes.