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Survival from time of relapse of patients with unsuspected relapse detected by monitoring that included iodine-123–metaiodobenzylguanidine (123I-MIBG) scans (blue line), unsuspected relapse detected by monitoring that included iodine-131–metaiodobenzylguanidine (131I-MIBG) scans (gray line), and symptomatic relapse (gold line; P < .001).
