Comparison of clinicopathological features in metastatic upper tract urothelial carcinoma and urothelial bladder cancer.

Purpose To compare the characteristics of primary tumors, sites distribution of metastases and the metastasis-free interval (MFI) between metastatic upper tract urothelial carcinoma (UTUC) and urothelial bladder cancer (UBC), and evaluate the clinicopathological factors associated with MFI.