A rapid and sensitive method for determination of veliparib (ABT-888), in human plasma, bone marrow cells and supernatant by using LC/MS/MS.

A rapid and sensitive method was developed and validated using a liquid chromatographic method with tandem mass spectrometry detection (LC/MS/MS) for determination of veliparib (ABT-888) in plasma, bone marrow supernatant, and bone marrow cells. Sample preparation involved a single protein precipitation step by the addition of the sample with acetonitrile. Separation of veliparib and the internal standard, A620223.69, was achieved on a Atlantis™ dC18 column (100mm×2.1mm, 3μm) column using a mobile phase consisting of acetonitrile–ammonium acetate (2mM) containing formic acid (0.1%, v/v) using isocratic flow at 0.2mL/min for 3min. The analyte and internal standard were monitored by tandem mass spectrometry with electrospray positive ionization. Linear calibration curves were generated over the range of 5–1000nM. The values for both within day and between day precision and accuracy were well within the generally accepted criteria for analytical methods. This method was subsequently used to measure concentrations of veliparib in cancer patients receiving an oral daily dose of 10mg with demonstration of drug accumulation in the marrow compartment and in the target leukemia bone marrow cells.