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Molecular Pharmacology of Cancer Therapy in Human Colorectal Cancer by Gene Expression Profiling^{1 ,,2}

Cancer Research UK Centre for Cancer Therapeutics, Institute of Cancer Research, Sutton, Surrey SM2 5NG [P. A. C., M. L. G., S. E., P. W.]; Department of Gastrointestinal Oncology, Royal Marsden Hospital, Sutton, Surrey [D. C., M. E. H., D. M. T.]; and Department of Surgery, Mayday Hospital, Croydon, Surrey [M. L. G., R. I. S.], United Kingdom

Global gene expression profiling has potential for elucidating the complex cellular effects and mechanisms of action of novel targeted anticancer agents or existing chemotherapeutics for which the precise molecular mechanism of action may be unclear. In this study, decreased expression of genes required for RNA and protein synthesis, and for metabolism were detected in rectal cancer biopsies taken from patients during a 5-fluorouracil infusion. Our observations demonstrate that this approach is feasible and can detect responses that may have otherwise been missed by conventional methods. The results suggested new mechanism-based combination treatments for colorectal cancer and demonstrated that expression profiling could provide valuable information on the molecular pharmacology of established and novel drugs.

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