- Patients with International Neuroblastoma Staging System (INSS) stage 4 disease are eligible with the following: MYCN gene amplification (greater than four-fold increase in MYCN signals as compared to reference signals), regardless of age or additional biologic features, Age greater than 18 months ( greater than 547 days) regardless of biologic features, Age 12 -18 months (365 - 547 days) with any of the following unfavorable biologic features (unfavorable pathology and/or DNA index = 1) or any biologic feature that is indeterminate/unsatisfactory/unknown