Quantification of Imatinib in Human Plasma by High-Performance Liquid Chromatography-Tandem Mass Spectrometry.
Posted by rob on September 26, 2005 under Uncategorized | 
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Titier K, Picard S, Ducint D, Teilhet E, Moore N, Berthaud P, Mahon FX, Molimard M
Ther Drug Monit. 2005 Oct ; 27(5): 634-640
Imatinib, also known as Gleevec(R) or Glivec(R), is a selective tyrosine kinase inhibitor currently used for the treatment of Philadelphia chromosome-positive chronic myeloid leukemia (CML) and for other malignant pathologies. We have developed a LC-NS-NS method that could be used for imatinib therapeutic drug monitoring in plasma. After a liquid-liquid extraction, the imatinib and its deuterated internal standard were eluted on an XTerra(R) RP18 column with a gradient of acetonitrile-ammonium formiate buffer 4 mmol/L, pH 3.2. Imatinib was detected by electrospray ionization mass spectrometry with multiple reaction-monitoring mode. The calibration curves were linear over the range 10-5000 ng/mL. The limit of quantification was set at 10 ng/mL. The bias was lower than 8%. Intra-day and inter-day precisions were lower than 8%. The extraction recovery was higher than 90%. This method is simple, adapted to routine application, and allows accurate therapeutic monitoring of imatinib. It can be used to evaluate patient adherence to daily oral therapy, drug-drug interactions, or pharmacokinetic/pharmacodynamic relationships.
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