PGR and neoplasm: The expression level of IL-10 in the ER-negative or PR-negative tumor tissue was significantly higher in ER-positive or PR-positive tumors (p = 0.014 and p = 0.007, respectively; Table 1), but no significant correlation was found in those over aged 65 (p = 0.446; Table 1) or with HER2-positive tumors (p = 0.929; Table 1).