Figure 1. Kaplan–Meier survival curves of recurrence in the urinary tract. There was no significant difference between green tea intake and recurrence-free survival rates in entire (A), bladder cancer (B), and upper urinary tract cancer (C) patients. On the other hand, when similar analyses were performed in never smokers, the frequency of green tea intake was significantly associated in all (D), bladder cancer (E), and upper urinary tract cancer (F) patients.