There are limitations with morphol. and a felt need for a diagnostic test with a short turn-around time for rapid diagnosis of acute promyelocytic leukemia.To identify a unique protein biomarker in APL, we did a quant. proteomic anal. on five acute myeloid leukemia (AML), APL and acute lymphoblastic leukemia (ALL) bone marrow mononuclear cells (MNCs) collected at diagnosis in comparison with peripheral blood mononuclear cells from healthy control (HC).Briefly, the proteins were extracted from cells using probe sonicator, followed by protein estimation, normalization, trypsin digestion and tandem mass tag (TMT) labeling.TMT labeled peptides were pooled and subjected to fractionation and liquid chromatog. and tandem mass spectrometry (LC-MS/MS) anal.