TfR1 protein levels were evaluated by IHC in non-neoplastic human tissue types from two sources: 1) RCC patient tissue microarrays (TMA(s)) which included 14 different normal tissue types as internal staining controls, and 2) a normal tissue TMA surveying 36 different body tissue types (Figure 1). The gene discussed is TFRC; the disease is renal cell carcinoma.