PECAM1 and kidney cancer: To assess the expression and prognostic value of CCND1 and PECAM1/CD31 in other tumors, we used the tumor-immune system interactions (TISIDB, http://cis.hku.hk/TISIDB/index.php) online database to detect the expression of CCND1 and PECAM1/CD31 in other types of tumors other than kidney cancer and to assess the prognostic value based on TCGA cohort.