THE ROLE OF 18F-FDG PET/CT METABOLISM PARAMETERS IN PREDICTING TREATMENT RESPONSE AFTER NEOADJUNCTIVE CHEMOTHERAPY WITH GP REGIMEN IN PATIENTS NASOPHARYNGEAL CANCER STAGES III, IVA
Main Article Content
Abstract
Objective: Studying the role of 18F-FDG PET/CT metabolic parameters in predicting response after neoadjuvant chemotherapy with GP regimen in patients with stage III, IVA nasopharyngeal cancer. Subjects and Methods: Retrospective combined prospective study on 43 patients with stage III and IVA nasopharyngeal cancer who had PET/CT scans before treatment and were treated with neoadjuvant chemotherapy using the GP regimen. Measurement of metabolic parameters on 18F-FDG PET/CT images. Enter and process data on SPSS 20.0 and Medcalc 20 software. Results: The optimal threshold values of MTV, SUVmax, SUVmean, SUVpeak, TLG to predict complete treatment response are 15,97; 13,29; 7,71; 10,24 and 118,07, respectively. Univariate analysis showed that SUVmax, SUVmean, SUVpeak, TLG were significantly associated with the prognosis of complete response after NAC treatment using the GP regimen with the given threshold values. In multivariate analysis, complete non-responders were significantly associated with TLG ≥ 118,07 (OR,15,5; 95% CI, 1,17 – 206,11; p< 0.05) with sensitivity, specificity and accuracy were 91,3%; 60%; 72,1%. Conclusion: TLG with the optimal threshold value of 118.07 has independent prognostic value for complete response after NAC treatment with GP regimen in patients with stage III and IVA nasopharyngeal cancer with sensitivity, specificity and accuracy of 91,3%; 60%, 72,1%.
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Keywords
nasopharyngeal cancer, 18F-FDG PET/CT metabolic parameters, response treatment
References
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