The IM subtype of breast cancer is associated with elevated expression of immune-related genes, as BIRC3, BTN3A1, CSF2RB, GIMAP7, GZMB, HCLS1, LCP2, and SELL, and is positively correlated with expression of PD-L1, PD-1, and CTLA4. Here, GZMB is linked to breast cancer.