I-mIBG therapy in relapsed/refractory neuroblastoma: A weapon from the future past.

Neuroblastoma (NB) is the most common extracranial solid tumor in children, with variable outcomes ranging from spontaneous remission to high-risk cases often leading to relapse or refractory disease. Approximately 50 % of patients with NB have high-risk features, often experiencing relapse or refractory disease despite intensive treatments and the prognosis remains poor, with long-term event-free survival (EFS) rates below 10 %,Radioactive iodine-labeled meta-iodobenzylguanidine (¹³¹I-mIBG) therapy, leveraging NB cells' radiosensitivity and expression of the norepinephrine transporter (NET), has shown promise in treating relapsed or refractory NB. Since 1985, ¹³¹I-mIBG has been studied to determine the maximum tolerated dose and side effects, with recent trials exploring its use in front-line treatment. Our systematic review, based on MEDLINE, EMBASE, and Cochrane CENTRAL databases up to December 2023, evaluates the effectiveness and toxicity of ¹³¹I-mIBG therapy in relapsed/refractory NB. It also discusses its potential role in conjunction with emerging therapies like CAR-T cells, haploidentical stem cell transplantation, and dinutuximab beta.