Biologic V ariables i n t he O utcome o f S tages I a nd I I Neuroblastoma T reated W ith S urgery a s P rimary T herapy: A C hildren's C ancer G roup S tudy

Purpose: To determine prospectively whether surgery alone is sufficient therapy for Evans stages I and II neuroblastoma and to define biologic and clinical features having prognostic potential for this group. Patients and Methods: Between June 1989 and August 1995, 374 eligible children (age range, 0 to 18 years) with newly diagnosed stage I (n 5 141) and stage II (n 5 233) neuroblastoma were registered onto Children’s Cancer Group trial 3881. Surgical resection was the only primary therapy except in cases with spinal cord compression, where radiation therapy was allowed. Event-free survival (EFS) and overall survival (OS) were analyzed by life-table methods according to clinical and biologic features. Results: EFS and OS (mean 6 SE) for all stage I patients were 93% 6 3.0% and 99% 6 1.0%, respectively, compared with 81% 6 4.0% and 98% 6 2.0%, respectively, for stage II patients. The significantly higher recurrence rate among stage II patients was managed successfully in 38 of 43 children with either surgery or multimodality treatment. There was one death among stage I patients and six among stage II. For stage II patients tumor MYCN gene amplication, unfavorable histopathology, an age greater than 2 years, and positive lymph nodes predicted a lower OS (P 2 years of age with either unfavorable histopathology or positive lymph nodes. J Clin Oncol 18:18-26. © 2000 by American Society of Clinical Oncology.