Measuring tumor pharmacodynamic response using PET proliferation probes: the case for 2-[(11)C]-thymidine.
AffiliationDepartment of Radiotherapy, St. Bartholomews' Hospital, West Smithfield, London EC1A 7BE, UK.
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Abstract[(18)F]-fluorodeoxyglucose ((18)F-FDG) positron emission tomography (PET) is becoming accepted as a diagnostic tool for cancer, but the potential uses of PET in oncology extend beyond the imaging of glucose metabolism. The development of a PET proliferation probe would be a useful pharmacodynamic tool. [(11)C]-thymidine PET has been assessed in man as a specific measure of tumor proliferation. Uptake of [(11)C]-thymidine is related to DNA synthesis and, in human tumors, correlates with proliferation. When compared with (18)F-FDG, it has been shown to be a more sensitive discriminator of early clinical tumor response. 2-[(11)C]-thymidine PET scanning of patients enrolled in early phase clinical trials is feasible and should support future drug development. Although recent research is moving away from the validation of thymidine towards thymidine analogues radiolabeled with (18)F, the better specificity of thymidine for DNA should be the rationale for its continued development and application as a PET probe. This review describes the historical development, application and current research status of [(11)C]-thymidine PET, and aims to highlight the need for its continuing development as a marker of tumor proliferation.
CitationMeasuring tumor pharmacodynamic response using PET proliferation probes: the case for 2-[(11)C]-thymidine. 2004, 1705 (2):91-102 Biochim. Biophys. Acta
JournalBiochimica et Biophysica Acta
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