Are leukodystrophies like metachromatic leukodystrophy (mld) treatable?

Leukodystrophy: There is no cure for mld. Bone marrow transplantation may delay progression of the disease in some cases. Other treatment is symptomatic and supportive. Considerable progress has been made with regard to gene therapy in an animal model of mld. (http://www.Ninds.Nih.Gov/disorders/metachromatic_leukodystrophy/metachromatic_leukodystrophy.Htm).