The histology of the abdominal tumor revealed a neuroblastoma, which was poorly differentiated, had a high mitosis-karyorrhexis index, an unfavorable histology, and no MYCN gene amplification.6,7 The dissemination of metastases in the thoracic vertebrae prompted a diagnosis of stage 4 neuroblastoma. The gene discussed is MYCN; the disease is neuroblastoma.