The following graph shows Kaplan-Meier survival curves -in this case, time to recurrence of tumor- for patients with bladder cancer separately fortwo treatment groups: placebo and thiotepa.Based on the graph and information given in each question, answer each of the following questions.

Survival Functions 1.0 treatment placebo :thiotepa 0.8 - + placebo-censored + thiotepa-censored 0.6 Cum Survival ....m............. 0.4 0.2 - 0.0 - 10 20 30 40 50 60 Time (months)