Role of autotransplantation in neuroblastoma.

Neuroblastoma is the most enigmatic disease treated by pediatric oncologists. The same pattern of apparent metastatic spread is associated with a high rate of spontaneous regression in children under 1 year of age (stage IVS) but an invariably fatal course in older children. For these children with truly advanced neuroblastoma, recent studies have demonstrated that the possibility of complete remission and disease-free survival is increased with more intensive conventional combination chemotherapy. Supportive care with autologous marrow has enabled further significant dose escalation of cytotoxic therapy active against neuroblastoma, resulting in disease-free survival in between 25% and 50% of patients at 2 years, an improvement over historical experience with conventional chemotherapy. The development of more effective cytotoxic combinations active against neuroblastoma, improvements in ex vivo techniques to purge marrow of neuroblastoma cells, and the application of cytokines to hasten marrow recovery should further enhance the effectiveness of autotransplantation in the treatment of advanced neuroblastoma and further improve the chances for complete remission and longer remission duration. Whether this improved remission induction and duration will translate into an increased cure rate remains to be determined. Parallel advances in therapies not involving autologous marrow support will undoubtedly modify the role of autotransplantation in neuroblastoma. Currently, however, autotransplantation offers one potential solution to a major challenge in the treatment of advanced neuroblastoma--obtaining and maintaining complete remissions--and a promising basis for future therapeutic studies.