RBP1 and cholangiocarcinoma: Paired average and tumor tissue data from the TCGA database showed low expression of RBP1 in Bladder Urothelial Carcinoma (BLCA), cholangiocarcinoma (CHOL), esophageal carcinoma (ESCA), head and Neck squamous cell carcinoma (HNSC), kidney renal clear cell carcinoma (KIRC), and prostate adenocarcinoma (PRAD) (Figure 3G).