BCAM and nonpapillary renal cell carcinoma: Compared with the median expression level of corresponding normal tissues, BCAM expression remarkably decreased in all three classic subtypes of RCC (low-expressed proportions: ccRCC: 518/530, 97.74%; pRCC, 285/288, 98.96%; chRCC, 59/65, 90.77%; p < 0.001).