IHC analysis in 102 RCC patients that included 86 clear cell carcinomas, 10 papillary carcinomas, 3 chromophobe cell types and three cases of cancer of the collecting duct of Bellini as well as 6 matched lymph node metastases and seven cases of neoplastic embolus in the renal vein showed high AEG-1 expression in 96 cases, especially in lymph node metastases and neoplastic emboli with weak AEG-1 expression in normal tubular epithelium and no expression in normal glomeruli [99]. This evidence concerns the gene MTDH and thyroid gland papillary carcinoma.