CD34 and myelodysplastic syndrome: More recently, Locatelli's group analyzed the outcome of 72 pediatric patients given a CD34+ positively selected haplo HSCT for the treatment of acute leukemia (ALL 42 cases and AML 21 cases) or myelodysplastic syndrome (MDS, 9 cases) transplanted at the Pediatric Hematology and Oncology, Policlinico San Matteo, Pavia.