- After the stem cell transplant, recipients will receive two days of a chemotherapy called cyclophosphamide on day's + 3 and + 4 followed by two drugs tacrolimus and mycophenolate to prevent graft versus host disease where the donor cells attack the patient's body. All patients will remain in the hospital for approximately 1 month, and will be followed with regular visits for up to 3 years with periodic visits thereafter to evaluate the success of the transplant and any side effects.