Kaplan–Meir plots for overall survival (OS) according clinic-pathological feature in patients with primary bladder cancer. Stratified survival curves for 65 patients were evaluated. a Patients with superficial and invasive stage *p = 0.03.
b Patients with low and medium- and high- grade tumors *p = 0.01.
c Patients with and without recurrence history *p = 0.04. d Patients with and without tumor progression ***p = 0.0002