Two cases of AMeD syndrome with isochromosome 1q treated with allogeneic stem cell transplantation.

AMeD syndrome is characterized by aplastic anemia, mental retardation, short stature, and microcephaly and is caused by digenic mutations in the aldehyde dehydrogenase 2 (ALDH2) and alcohol dehydrogenase 5 (ADH5) genes. We have successfully performed hematopoietic stem cell transplantation in two patients with AMeD syndrome and isochromosome 1q. AMeD syndrome with myelodysplastic syndrome or acute myeloblastic leukemia generally has a poor prognosis; however, early diagnosis may improve treatment response. Although the gain of 1q has been considered as a form of early clonal evolution in Fanconi anemia, it may be an equally important finding observed in AMeD syndrome.