Previously procured and archived bone marrow aspirate samples, blood and buccal cell samples, and bone marrow biopsy slides are analyzed for FLT3 ITD, MLL PTD, NPM1, KIT, KRAS, NRAS, CEBPA, WT1, JAK2, RUNX1, TET2, ASXL1, IDH1 and IDH2, and CBL mutations, CBF fusion genes, levels of BAALC, ERG, EVI1, MN1, and APP microarray gene-expression, microRNA gene-expression signature, levels of methylation of genes silenced in AML, and genomic DNA by PCR amplification, RT-PCR, and denaturing high-performance liquid chromatography.