Pearson correlation coefficients between CYP1B1 mRNA T/N expression ratio and T/N expression ratio in CYP1 activity of bladder tumors were higher than those corresponding to CYP1A1 mRNA T/N expression ratio levels (R = 0.94 vs 0.27 Figure 8A). This evidence concerns the gene CYP1A1 and urinary bladder neoplasm.