The aim of our study was to quantify the risk of second malignant neoplasms (SMNs) among long-term survivors of neuroblastoma and to study the influence of treatment on this risk. We studied data from 544 5-year survival patients diagnosed with neuroblastoma before age 16 years at 8 French and British treatment centres from 1948 to 1986. After an average follow-up of 15 years (range, 5-38 years), 12 children developed a total of 13 SMNs, whereas 1.19 were expected from general population rates. Among these SMNs, there were 5 thyroid and 3 breast cancers. Increases of the risks of SMN were observed with time since neuroblastoma diagnosis and attained age. In a multivariate analysis, the relative risk of SMN associated with radiotherapy was 4.3 (95% CI 0.8 -78), whereas no increased risk of SMN was associated with the administration of chemotherapy as a whole (RR ؍ 0.4, 95% CI 0.1-1.9). Young children treated for a neuroblastoma have significantly increased risks of SMN over 3 decades of follow-up. Radiotherapy treatment was found to be an important risk factor for developing SMNs, whereas no effect of chemotherapy was evidenced. Although our findings reflect the late effects of past therapeutic modalities, they underscore the importance of long-term surveillance of young children treated for a neuroblastoma. For these patients, many more years of follow-up are required to appreciate their overall risks of treatment-related SMNs. © 2003 Wiley-Liss, Inc.
Key words: second malignant neoplasm; radiation; childhood cancer; neuroblastomaNeuroblastoma is one of the most common solid tumors in childhood. Conventional treatments of this neoplasm integrate surgery, radiation therapy, combination chemotherapy and more recently, high-dose chemotherapy followed by bone marrow transplantation. Treatment options are related to age of the child, location and biology of the tumor and stage of disease.After successful treatment of malignant diseases in childhood, the problem of long-term complications came to the fore. General evaluation of the long-term carcinogenic risks induced by radiotherapy, chemotherapy and their association after treatment for childhood cancer, have already been published. 1-5 However, cohort studies dealing with the very long-term incidence of second malignant neoplams (SMNs) in children initially treated for a neuroblastoma are sparse. 1,3,[5][6][7][8][9][10] This rarity is due in part to the low survival rates from neuroblastoma, in particular for the patients treated in past decades before the introduction of new therapeutic approaches. Therefore, little is known about the factors that determine the long-term risk of SMN following this cancer.In our current study, we investigated the role of radiotherapy and chemotherapy given for the neuroblastoma treatment on the risk of subsequent SMN development for 544 5-year survival patients treated for a neuroblastoma from 1948 -1986 at 8 hospital centres in France and Great Britain. Our study, including about 1/3 of 25-year survival patients, enabled us to a...