CEL and chronic myelogenous leukemia, BCR-ABL1 positive: The plasma CML and CEL concentrations were determined by liquid chromatography–tandem mass spectrometry (LC–MS/MS) to be on average 1.8 μM and 1.0 μM, respectively, i.e., with a molar ratio of 1.8:1, indicating CML as the more abundant AGE in plasma.