In our multivariate model, only FLT3‐ITD (P = 0.001), cytogenetic risk (P < 0.001), and CD9 expression (P = 0.004) were independent prognostic factors: CD9 expression on blast cells positively affected EFS, especially for CN‐AML patients (data not shown). Here, FLT3 is linked to acute myeloid leukemia.