Overall survival according to treatment arm. The probabilities of overall survival (95% confidence interval) are shown below each time point. Without thalidomide (dotted line); with thalidomide (solid line). The probability of overall survival (95% CI) after enrollment at 2 years, 3 years, and 4 years with thalidomide is 97 (93-98), 93 (87-96), and 87 (80-93), respectively, and without thalidomide is 94 (91-96), 87 (83-90), and 75 (69-82), respectively.