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Can 3'-deoxy-3'-(18)F-fluorothymidine Or 2'-deoxy-2'-(18)F-fluoro-d-glucose PET/CT Better Assess Response After 3-weeks Treatment By Epidermal Growth Factor Receptor Kinase Inhibitor, In Non-small Lung Cancer Patients? Preliminary Results.

Amit Bhoil, B. Singh, Navneet Singh, R. Kashyap, A. Watts, S. Sarika, B. Mittal
Published 2014 · Medicine

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The objectives of this study was to study the diagnostic efficacy of 3'-deoxy-3'-fluorine-18-fluorothymidine ((18)F-FLT) and of 2'-deoxy-2'-(18)F-fluoro-d-glucose ((18)F-FDG) positron emission tomography/computed tomography (PET/CT) for response evaluation following three weeks treatment by epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI) in non small cell lung cancer (NSCLC) patients. Fifteen patients of advanced stage (IIIB-IV) NSCLC planned for oral 1st or 2nd/3rd line EGFR-TKI treatment were enrolled in the study. Baseline, prior to treatment, and follow-up after three weeks, (18)F-FLT and (18)F-FDG PET/CT imaging was performed in all patients. The standard uptake lean body mass (SULpeak) and total lesion glycolysis (TLG) values of the hottest lesions were calculated in all patients using semi-quantitative analysis. Statistical analysis on PET semi-quantitative data was used to evaluate the overall survival (OS) and progression free survival (PFS). The patients were either classified as responders or non-responders or at a steady state according to the PET response criteria in solid tumors (PERCIST). The receiver operating characteristic curve (ROC) analysis was done on the (18)F-FDG PET/CT clinical responders, to derive the cut-off values on the corresponding data sets between responders and non responders. Results showed that in responders (18)F-FDG SULpeak values better predicted OS and PFS values when compared to (18)F-FLT SULpeak values and also were a better predictor of OS as compared to the TLG values. In responders, the ROC analysis carried out on (18)F-FLT PET/CT imaging data in responders indicated a decrease of ≥22% in SULpeak and a decrease of ≥0.7 in absolute values. Three (3/15) patients developed resistance to EGFR-TKI treatment at 3 months of follow-up. In conclusion, in both responders and in non responders, patients with NSCLC treated for 3 weeks by EGFR-TKI, both OS and PFS were better predicted by (18)F -FDG SULpeak than by (18)F -FLT SULpeak. Although, the difference was only borderline, yet, (18)F -FDG SULpeak was a better predictor of OS compared to TLG values. However, to validate these findings, studies need to be carried in a larger number of patients.
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