The rates of p-ELK1 positivity in the renal pelvic tumors, ureteral tumors, and bladder tumors were 40.0% (18 of 45), 56.0% (28 of 50), and 65.9% (85 of 129; shown in our previous study [11]), respectively (renal pelvis vs. bladder: P = 0.003; ureter vs. bladder: P = 0.231). This evidence concerns the gene ELK1 and urinary bladder neoplasm.