Abstract
Neuroblastoma is a rare malignant disease and patients with high-risk neuroblastoma have a poor prognosis. Retinoic acid has been shown to inhibit growth of human neuroblastoma cells and has been considered as a potential candidate for improving the outcome. The objective was to evaluate effects of retinoic acid after consolidation with high-dose chemotherapy and bone marrow transplantation as compared to placebo or no further treatment in patients with high-risk neuroblastoma. We searched the databases CENTRAL, MEDLINE, and EMBASE from inception to 01 October 2014 and included randomized controlled trials. We identified one relevant randomized controlled trial with 50 participants receiving retinoic acid and 48 participants receiving no further therapy. There was no statistically significant difference between the treatment groups in overall survival (hazard ratio 0.87, 95% confidence interval 0.46-1.63, P=0.66) and event-free survival (hazard ratio 0.86, 95% confidence interval 0.50-1.49, P=0.59). We did not identify results for other outcomes, including toxicity. The difference in overall and event-free survival between treatment alternatives was not statistically significantly different. Based on the currently available evidence, we are uncertain about the effects of retinoic acid after bone marrow transplantation in patients with high-risk neuroblastoma.
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