4. Patients > 18 years of age, White cell count >= 12,000/mm3 or <= 4,000/mm3 Patients 13-18 years of age, White cell count >= 11,000/mm3 or <= 4,500/mm3 Patients 6-12 years of age, White cell count >= 13,500/mm3 or <= 4,500/mm3 OR A differential count showing > 10% immature neutrophils