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We investigated the differences in plasma protein binding of flavone acetic acid (FAA) in mice and men in an attempt to explain the inter-species differences in response. In vitro data indicate both qualitative and quantitative differences in FAA protein binding: approximately 80% is bound in humans, with two different types of binding site identified; in mice, 70% is bound and only one binding site could be described. Protein binding is dose-dependent in both species. Plasma samples from 20 patients receiving FAA showed that most achieved levels that would be active in mice. We conclude that these differences in protein binding are insufficient to explain totally the observed differences in response.

Original publication

DOI

10.1007/bf00435845

Type

Journal article

Journal

Cancer Chemother Pharmacol

Publication Date

1989

Volume

23

Pages

397 - 400

Keywords

Animals, Antineoplastic Agents, Blood Proteins, Chromatography, High Pressure Liquid, Flavonoids, Humans, Kinetics, Mathematics, Mice, Models, Theoretical, Neoplasms, Prognosis, Protein Binding, Species Specificity