In order to find the possible role of NPTX2 on EOC, we first searched the available literature about the roles of NPTX2 in malignant tumors and NPTX2 was reported mainly participated in five cancers, including glioma, pancreaticobiliary cancer, colorectal cancer, renal cell carcinoma and neuroblastoma (16–21). Here, NPTX2 is linked to renal cell carcinoma.