MX1 and renal cell carcinoma: It was observed that the mean relative MX1 mRNA expression level (13.65±7.34) of the RCC patients was lower compared with the controls (27.96±9.98; P=0.0001; Fig. 3) and a negative correlation was observed between MX1 mRNA expression and TNM staging (r=−0.731, P=0.001; Fig. 4).