Quantification of topotecan by liquid chromatography-mass spectrometry (LC-MS). Application to intestinal transport
Cécile Arellano1, Peggy Gandia, Laure Bettuing
1EA3035 Clinique et Expérimentale de Médicaments Anticancereux, Institut Claudius Regaud, 31052 Toulouse, France. arellano@cict.fr
Abstract:
Topetecan is an important anti-cancer drug that has recently become available as an oral formulation. In order to study its intestinal absorption in vitro and a potential drug-drug interaction with the anti-emetic ondansetron, a sensitive and accurate method for the analysis of topotecan in biological media was required. We developed a liquid-liquid extraction method at pH 7.0-7.5 with a recovery of 85% and which took into account the complex chemical behaviour of topotecan related to the lactone opening and the keto-enol tautomerism. This enabled us to validate a new specific and sensitive LC-MS method of analysis, with satisfactory inter- and intra-day repeatability and accuracy. The method was applied to a study of topotecan uptake in rat everted gut sacs that showed that, despite being a P-glycoprotein substrate like topotecan, ondansetron did not interfere with topotecan uptake.
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