ALD-101 Adjuvant Therapy of Unrelated Umbilical Cord Blood Transfusion (UCBT) in Patients With Inherited Metabolic Diseases

Subjects will be hospitalized and undergo high doses of chemotherapy which will destroy the child's normal cells including their bone marrow (which forms blood cells) in order to prepare their body for the umbilical cord blood transplant. The cord blood transplant is intended to rescue your child's bone marrow from the bad effects of the procedure. The child will receive 80% of a standard cord blood transplant followed by 20% supplemental stem cell called ALD-101. The study will evaluate if these cells (ALD-101) will repopulate the bone marrow more rapidly after transplant. This would shorten the period of time that the transplanted subject would be at risk for infection and bleeding and would also decrease the number of red blood cell and platelet transfusions needed. ALD-101 has been used as a supplement to cord blood transplant in twenty-eight children with genetic diseases and malignancy in one previous clinical study that is on-going. The main purpose of this research study is to test whether a portion of cord blood cells that have been separated from a cord blood unit (ALD-101) will increase the speed at which normal levels of circulating blood cells are re-established after transplant. This is the experimental part of this study. ALD-101 is also being tested to see if it is safe.