Medical Genetics Treatment Bone marrow transplantation has been successful some success has been achieved with fetal thymus transplants. The severity of the heart disease often determines the eventual prognosis. Partial deficiency is compatible with prolonged survivalMedical Genetics Treatment Bone marrow transplantation has been successful. Some success has been achieved with fetal thymus transplants. The severity of the heart disease often determines the eventual prognosis. Partial deficiency is compatible with prolonged survival