Neuroblastoma: Any patient with metastatic disease at diagnosis (POG stage D or Evans' stage IV); or, patients with loco-regional metastatic disease (POG stage C) or tumor infiltrating across the midline (Evans' stage III) IF they have an elevated serum ferritin (greater than 142 ng/ml), an amplified N-myc copy number (greater than 10 copies on Southern analysis), or a DNA index of greater than 1.1.