PGA5 and cholangiocarcinoma: PGA5 expression was higher in kidney renal clear cell carcinoma and kidney renal papillary cell carcinoma, but lower in stomach adenocarcinoma, esophageal carcinoma, cholangiocarcinoma, colon adenocarcinoma, uterine corpus endometrial carcinoma, prostate adenocarcinoma, breast cancer, kidney chromophobe, and thyroid carcinoma (Figure 1A).