10. Age greater than or equal to 1 year but less than or equal to 55 years (Myeloablative Regimen 4). Eligibility for pediatric patients will be determined in conjunction with an MD Anderson Cancer Center (MDACC) pediatrician. Patients >55 but < 65 years who have a Performance Status of 0 or 1 and no comorbidities may receive the myeloablative regimen 4 at the discretion of the investigator(s).