PCDH17 and acute myeloid leukemia: To assess whether the prognostic impact of PCDH17 expression is independent from knowing clinical factors, especially recurrent mutations found in AML, a univariate analysis was first conducted for the TCGA cohort (Detailed results were shown in Additional file 1: Table S3), variables considered significant (P ≤ 0.2) were further included in the multivariate Cox proportional hazard model.