CXCL16 and renal cell carcinoma: Two of the seven genes, CXCL16 and KTN19, demonstrated frequent promoter region hypermethylation in RCC cell lines (40 and 62%, respectively) and in primary RCCs (42% (n=62) and 38% (n=66), respectively, but not in normal renal tissue from patients without cancer (n=6).