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Role of 18F-FDG PET/CT in restaging and follow-up of patients with GIST

  • Domenico AlbanoEmail author
  • Bonacina Mattia
  • Raffaele Giubbini
  • Francesco Bertagna
Hollow Organ GI

Abstract

Purpose

Gastrointestinal stromal tumor (GIST) is a rare tumor with high risk of recurrence and poor prognosis in case of advanced GIST. The aim of this study was to evaluate the possible role of 18F-FDG PET/CT in restaging GIST.

Methods

Fifty-four patients (30 male) with histological proven GIST underwent 100 18F-FDG PET/CT for restaging in suspected recurrence or during follow-up. Histopathology results and/or clinical/imaging follow-up for at least 12 months were considered as reference standard. Moreover, the diagnostic accuracy and clinical impact of 18F-FDG PET/CT were calculated.

Results

Twenty-seven (27%) 18F-FDG PET/CT were positive, while the remaining 73 (73%) were negative. Sensitivity, specificity, PPV, NPV, and accuracy of PET/CT were 89% (95% CI 72–98%), 97% (95% CI 90–100%), 93% (95% CI 76–98%), 96% (95% CI 89–98%), and 95% (95% CI 89–98%). 18F-FDG PET/CT had a positive clinical impact in 18/100 studies changing the management, in 8 cases switching from local therapy to systemic therapy due to the detection of disseminate disease at PET/CT, in three cases recognizing relapse not detected by conventional imaging, and in 7 cases demonstrating to be true negative and avoiding unnecessary therapies.

Conclusions

18F-FDG PET/CT seems to be an accurate method for detection and localization of local and distant recurrence in GIST with good sensitivity and specificity and significant impact on clinical decision-making.

Keywords

GIST 18F-FDG PET/CT PET/CT Restaging 

Notes

Compliance with ethical standards

Conflict of interests

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Nuclear Medicine, Spedali Civili BresciaBresciaItaly
  2. 2.Nuclear MedicineUniversity of Brescia and Spedali Civili BresciaBresciaItaly

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