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Related Concept Videos

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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Related Experiment Video

Updated: Jun 2, 2025

Gene Regulation and Targeted Therapy in Gastric Cancer Peritoneal Metastasis: Radiological Findings from Dual Energy CT and PET/CT
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18F-FAPI-42 PET/CT and 18F-FDG PET/CT in Patients with Malignant Digestive System Neoplasms: A Head-to-Head

Min Xiong1, HongJi You1, Jingmin Feng1

  • 1Department of Nuclear Medicine, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, 510260, China.

Molecular Imaging and Biology
|January 13, 2025
PubMed
Summary

18F-FAPI-42 PET/CT offers superior diagnostic accuracy for digestive system cancers compared to 18F-FDG PET/CT. This novel tracer improves lesion detection and influences treatment decisions in patients with malignant neoplasms.

Keywords:
18F-FAPI-4218F-FDGDigestive system neoplasmFibroblast activation proteinPET/CT

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Area of Science:

  • Oncology
  • Radiology
  • Nuclear Medicine

Background:

  • Fibroblast activation protein (FAP) is a transmembrane protease overexpressed in various cancers.
  • Radionuclide-labeled fibroblast activation protein inhibitors (FAPI) are emerging as promising tumor imaging agents.
  • 18F-FDG PET/CT is a standard imaging modality but has limitations in certain gastrointestinal malignancies.

Purpose of the Study:

  • To compare the diagnostic performance of 18F-FAPI-42 PET/CT with 18F-FDG PET/CT in patients with malignant digestive system neoplasms.
  • To assess tracer uptake and lesion visualization in primary and metastatic sites.
  • To determine the potential clinical benefit of 18F-FAPI-42 PET/CT in patient management.

Main Methods:

  • Simultaneous 18F-FAPI-42 PET/CT and 18F-FDG PET/CT were performed in 42 patients with digestive system neoplasms.
  • Quantitative analysis included standardized uptake value (SUV), tumor-to-liver ratio (TLR), and tumor-to-blood pool ratio (TBR).
  • Two independent readers assessed lesion number and location; interobserver agreement was calculated using Cohen's kappa.

Main Results:

  • 18F-FAPI-42 PET/CT demonstrated higher uptake and better tumor-to-background contrast than 18F-FDG PET/CT.
  • Diagnostic accuracy for 18F-FAPI-42 PET/CT ranged from 95.24% to 100%, outperforming 18F-FDG PET/CT.
  • Additional lesions were visualized with 18F-FAPI-42 PET/CT, particularly liver and peritoneal metastases.
  • Treatment strategies were modified in 40.48% of patients based on 18F-FAPI-42 PET/CT findings, versus 4.8% for 18F-FDG PET/CT.

Conclusions:

  • 18F-FAPI-42 PET/CT is a valuable tool for assessing primary digestive system tumors and metastases.
  • It offers superior lesion visualization and diagnostic accuracy compared to 18F-FDG PET/CT.
  • 18F-FAPI-42 PET/CT aids in staging, restaging, and treatment decision-making, potentially guiding FAP-targeted therapy or immunotherapy.