CD8A and neoplasm: Interestingly, despite comparable B7-H1 expression, female mice were more sensitive to PD-L1 blockade, and treatment with an anti-B7-H1 blocking monoclonal antibody reduced tumor growth to a greater degree in females compared to male mice, as a result of greater reduction in Treg function and increase in tumor-specific cytotoxic (CD8) T-cells in females (20).