Hematopoietic Stem Cell Transplantation in High Risk Patients With Fanconi Anemia

Given 15 mg/kg/day intravenously every 12 hours on Days -5 through -1.

given 5 mcg/kg/day intravenously on Day 1 (continue until absolute neutrophil count (ANC) ≥2.5 x 10\^9/L)

Busulfan 0.8 mg/kg intravenously (IV) every 12 hours on Days -7 and -6 (1.0 mg/kg IV if \<4 years old)

10 mg/kg intravenously (IV) on Days -5 through -2.

35 mg/m\^2 intravenously (IV) on Days -5 through -2.

1 mg/kg intravenously (IV) every 12 hours on Days -5 through -1.

Infused on Day 0 - Donor bone marrow or umbilical cord blood will be collected in the usual sterile manner using established parameters determined by the National Marrow Donor Program.