CD200 and acute myeloid leukemia: In multivariate analysis, statistical significance was retained by age of ≥55 (OR 2.0, 95% CI 1.4-2.9), secondary AML (OR 1.58, 95% CI 1.07-2.32), high WBC count (OR 2.0, 95% CI 1.36-2.9), CD34 positivity (OR 2.2, 95% CI 1.5-3.2), and CD200/BCL2 DP (OR 1.5, 95% CI 1.05-2.1).