The most typical characteristic gene for Tregs is FOXP3, highlighted in red in Figure 5B. In order to further explore different subtype of Treg cells intensively, Treg cells in the tumor microenvironment of OC were classified into six clusters, named Treg C1, Treg C2, Treg C3, Treg C4, Treg C5, and Treg C6 (Figure 5C,D). This evidence concerns the gene FOXP3 and neoplasm.