PECAM1 and malignant colon neoplasm: The results of the CD31 and PCDH17 double-stained tissue microarray showed that the expression of PCDH17 in the vascular endothelium of colon cancer with distant metastasis was higher than that in colon cancer without metastasis, and PCDH17 in colon cancer vascular endothelial cells may be involved in the distant metastasis of colon cancer.