- Availability of a matched-related donor who is not a carrier of the same genetic defect -Active infection at screening -Prior myeloablative transplant -Pregnant or nursing women and women of child bearing potential unless using highly effective contraception methods. For the pediatric population, female patients of child bearing potential who do not agree to abstinence or agree to use highly effective contraception methods -Sexually active male patients unless using condoms as contraception -Human Immunodeficiency virus (HIV) infection