Survival without skeletal event according to treatment arm. The probabilities of survival without skeletal event (95% confidence interval) are shown below each time point. Arm A received no maintenance (dotted line); arm B received maintenance with pamidronate (gray line); arm C received maintenance with pamidronate and thalidomide (solid line). The probability of survival without skeletal event (95% CI) after randomization at 1 year, 2 years, and 3 years in arm A is 89 (83-93), 78 (70-83), and 63 (52-74), respectively; in arm B is 91 (87-95), 79 (71-86), and 66 (55-76), respectively; and in arm C is 95 (91-98), 84 (78-90), and 69 (59-79), respectively.