Fourteen proteins were upregulated (keratin 4 [Krt4], transglutaminase 3 [TGM3], etc.)and 36 proteins were downregulated (LIPF, BPIFB1, C3, CFH, FGA, FGG, SERPING1, etc.)in the ESS group. Here, SERPING1 is linked to endometrioid stromal sarcoma.