18F-FDG PET/CT in Diagnostic and Prognostic Evaluation of Patients With Suspected Recurrence of Chondrosarcoma. (February 2018)

• Record Type: Journal Article
• Authors: Vadi, Shelvin Kumar; Mittal, Bhagwant Rai; Gorla, Arun Kumar Reddy; Sood, Ashwani; Basher, Rajender Kumar; Sood, Apurva; Kakkar, Nandita; Sen, Ramesh K.
• Is Part Of: Clinical nuclear medicine. Volume 43:Number 2(2018)
• Publication Date: 2018-02
• Subjects: chondrosarcoma -- FDG PET/CT -- grade -- recurrence evaluation -- survival; Nuclear medicine -- Periodicals; Radioisotope scanning -- Periodicals; Nuclear Medicine -- Periodicals; 616.07575
• DOI: 10.1097/RLU.0000000000001947
• Languages: English
• ISSNs: 0363-9762

Abstract

Abstract : Purpose: The aim of the study was to analyze the diagnostic and prognostic utility of 18 F-FDG PET/CT to predict the disease-specific survival (DSS) with FDG uptake and tumor grade in recurrent chondrosarcoma. Methods: Retrospective analysis of FDG PET/CT findings in 31 previously treated patients (46 studies) with mean follow-up period of 40.7 ± 23.9 months (range, 3–77 months) from the date of first PET/CT study was done. Kaplan-Meier DSS analysis was made with respect to tumor grade, FDG uptake at the recurrent primary sites, and a combination of grade and FDG uptake as parameters. Results: Recurrence (local and distant) was shown in 28 (60.8%) of 46 FDG PET/CT studies with sensitivity and specificity of 88.9% and 78.9%, respectively. The median SUVmax at the recurrent primary sites differed significantly ( P = 0.008) among 3 tumor grade groups, with higher median SUVmax in higher grades. There was significant difference in median SUVmax among different grade groups except between grade II and grade III. Recurrent primary site SUVmax cutoff at 6.15 derived from the receiver operating characteristic curve yielded significant difference ( P < 0.001) in mean DSS time. Significant difference in survival was noted between 3 different tumor grade groups ( P = 0.016). The combination of SUVmax and grade improved the survival prediction than with grade alone. Conclusions: In recurrent chondrosarcoma, the recurrent primary site FDG uptake and grade were found to be reliable prognostic factors with respect to DSS. PET/CT in recurrence setting has the potential to predict tumor grade and survival and may assist in clinical management.