title: FDG-PET imaging for the evaluation of antiglioma agents in a rat model.
abstract: The increasing development of novel anticancer agents demands parallel advances in the methods used to rapidly assess their therapeutic efficacy (TE) in the preclinical phase. We evaluated the ability of small-animal PET, using the (18)F-fluoro-deoxy-D-glucose (FDG) radiotracer, to predict the TE of a number of anticancer agents in the rat C6 glioma model following 3 days of treatment. Semi-quantitative measurements of changes in FDG uptake during the course of treatment (standardized uptake value response [SUV(r)]) were found to be significantly lower in tumors treated with the hypoxia-inducible factor-1alpha inhibitor YC-1 (15 mg/kg) than in tumors in the control group. No significant SUV(r) change was observed following a similar 3-day regimen with the proapoptotic agent NS1619 (20 microg/kg), the combination of YC-1 and NS1619, or the alkylating agent temozolomide (7.5 mg/kg). Quantitative immunohistochemical studies demonstrated significantly lower levels of glucose transporter-1 (GLUT-1) expression in the YC-1-treated tumors, thereby correlating with the low SUV(r) observed in this group. The ability of SUV(r) to predict gold-standard outcomes of TE was further validated as YC-1-treated tumors had decreased volumes compared to control tumors. As such, we successfully demonstrated the ability of FDG-PET to rapidly determine the TE of novel agents for the treatment of glioma in the preclinical phase of evaluation.
authors.affiliation: McConnell Brain Imaging Centre, Montreal Neurological Institute, 3801 University St., Montreal, QC, Canada H3A 2B4.
authors.forename: Sarah
authors.initials: S
authors.lastname: Assadian
authors.forename: Antonio
authors.initials: A
authors.lastname: Aliaga
authors.forename: Rolando F
authors.initials: RF
authors.lastname: Del Maestro
authors.forename: Alan C
authors.initials: AC
authors.lastname: Evans
authors.forename: Barry J
authors.initials: BJ
authors.lastname: Bedell
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000473:pathology; D019788:Fluorodeoxyglucose F18; D005910:Glioma / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000473:pathology; D051272:Glucose Transporter Type 1 / Q000096:biosynthesis; D007150:Immunohistochemistry; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000970:Antineoplastic Agents; D051272:Glucose Transporter Type 1; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18