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Novel Ga-FAPI PET/CT Offers Oncologic Staging Without COVID-19 Vaccine–Related Pitfalls

Journal of Nuclear Medicine, ISSN: 2159-662X, Vol: 64, Issue: 3, Page: 368-371
2023
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Most Recent News

Novel PET Radiotracer Reduces False-Positive Tumors After COVID-19 Vaccination

18F-FDG PET/CT detects approximately 73% of tumor lesions, while 68Ga-FAPI finds approximately 94%. Novel imaging agent 68Ga-FAPI can reduce the number of false-positive positron emission

Article Description

In the setting of ongoing coronavirus disease 2019 vaccination, vaccine-related tracer uptake in locoregional lymph nodes has become a well-known issue in tumor staging by F-FDG PET/CT. Ga-fibroblast-activation protein inhibitor (FAPI) PET/CT is a new oncologic imaging tool that may overcome this limitation. Methods: We assessed postvaccine head-to-head and same-day F-FDG and Ga-FAPI-46 PET/CT findings in a series of 11 patients from a large, prospective imaging registry. All patients with documented tracer uptake in locoregional lymph nodes on PET/CT or PET/MRI, after vaccination within 6 wk, were eligible for investigation. Result: Significant visual lymph node uptake adjacent to the injection site was noted in 11 of 11 (100%) patients with F-FDG PET/CT, versus 0 of 11 (0%) with Ga-FAPI PET/CT. F-FDG detected 73% and Ga-FAPI PET/CT 94% of all tumor lesions. Conclusion: In this case-series study, Ga-FAPI showed its potential to avoid F-FDG PET/CT postvaccination pitfalls and presented superior tumor localization.

Bibliographic Details

Demmert, Tristan T; Maric, Ines; Pomykala, Kelsey L; Lueckerath, Katharina; Siveke, Jens; Schaarschmidt, Benedikt M; Hamacher, Rainer; Herrmann, Ken; Fendler, Wolfgang P

Society of Nuclear Medicine

Medicine

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