Event-free survival according to treatment arm. The probabilities of event-free survival (95% confidence interval) are shown below each time point. Without thalidomide (dotted line); with thalidomide (solid line). The probability of event-free survival (95% CI) after randomization at 2 years, 3 years, and 4 years with thalidomide is 71 (63-78), 52 (43-62), and 36 (22-55), respectively, and without thalidomide is 58 (53-64), 37 (31-44), and 26 (14-41), respectively.