PGR and neoplasm: However, we detected no significant relationships between PD-L1 overexpression and tumor size (OR=1.64, 95% CI 0.66-4.07, P=0.29), progesterone receptor (PR) status (OR=0.32, 95% CI 0.10-1.02; P=0.05) or human epidermal growth factor receptor 2 (HER2) status (OR=1.14, 95% CI 0.74-1.75; P=0.54) (Figure 4).