KPNA2 and renal pelvis/ureter urothelial carcinoma: In our previous study, we found that for upper tract urothelial carcinoma (UTUC) patients, who have received radical nephroureterectomyh (RNU) operation, high expression of KPNA2 indicates poorer prognosis and could be used as an independent marker for bladder recurrence, overall survival(OS) and disease-free survival(DFS).