FOXP3 and neoplasm: A significant correlation was observed between the tumor weight (Fig. 5), Foxp3 expression, IL-2 production and CD25 expression, which was dependent on the days of tumor growth, with the exception of the correlation of IL-2 production with CD25 expression at 14 days (r2=0.832) and IL-2 production with tumor weight at 21 days (r2=0.688) (Table III).