CD200 and acute myeloid leukemia: In multivariate analysis statistical significance was maintained by advanced age (OR 2.1, 95% CI 1.07-4.21), secondary AML (OR 3.6, 95% CI 1.89-7.0), CD34 positivity (OR 3.1, 95% CI 1.62-6.0), and CD200/BCL2 DP (OR 1.9, 95% CI 1.03-3.7).