CD200 and myeloproliferative neoplasm: It was found that age (p<0.001), WBC count (p<0.001), history of MDS or MDS/MPN (p=0.009), MDS-related cytogenetic abnormalities (p<0.001), MLD (p=0.002), LDH (p<0.001), and MRC (p<0.001) were prognostic factors for OS.