In contrast to ccRCC tumors, no significant associations between non-ccRCC primary tumor TfR1 levels and adverse pathologic features were detected, with the exception that larger non-ccRCC tumors (>4 cm) had approximately twice as high TfR1 levels as smaller (<4 cm) non-ccRCC tumors (Figure 3A). The gene discussed is TFRC; the disease is nonpapillary renal cell carcinoma.