Please keep in mind:
More categorical variables you select would decrease the number of utilizable patients for prognosis analysis.

Please Cite OSblca in your works: Zhang G, Wang Q, Yang M, Yuan Q, Dang Y, Sun X, An Y, Dong H, Xie L, Zhu W, Wang Y and Guo X (2019) OSblca: A Web Server for Investigating Prognostic Biomarkers of Bladder Cancer Patients. Front. Oncol. 9:466. doi: 10.3389/fonc.2019.00466

DFI and PFI were defined by Liu et al. [Liu, J., Lichtenberg, T., Hoadley, K. A. et al. (2018). An integrated TCGA pan-cancer clinical data resource to drive high-quality survival outcome analytics. Cell,173(2), 400-416.]