Impact of FAPI-PET/CT on target volume definition in radiation therapy of locally recurrent pancreatic cancer
(1) Background: A new radioactive positron emission tomography (PET) tracer uses inhibitors of fibroblast activation protein (FAPI) to visualize FAP-expressing cancer associated fibroblasts. Significant FAPI-uptake has recently been demonstrated in pancreatic cancer patients. Target volume delineati...
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 February 2021
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| In: |
Cancers
Year: 2021, Volume: 13, Issue: 4, Pages: 1-13 |
| ISSN: | 2072-6694 |
| DOI: | 10.3390/cancers13040796 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/cancers13040796 Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2072-6694/13/4/796 
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| Author Notes: | Jakob Liermann, Mustafa Syed, Edgar Ben-Josef, Kai Schubert, Ingmar Schlampp, Simon David Sprengel, Jonas Ristau, Fabian Weykamp, Manuel Röhrich, Stefan A. Koerber, Uwe Haberkorn, Juergen Debus, Klaus Herfarth, Frederik L. Giesel and Patrick Naumann |
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| 520 | |a (1) Background: A new radioactive positron emission tomography (PET) tracer uses inhibitors of fibroblast activation protein (FAPI) to visualize FAP-expressing cancer associated fibroblasts. Significant FAPI-uptake has recently been demonstrated in pancreatic cancer patients. Target volume delineation for radiation therapy still relies on often less precise conventional computed tomography (CT) imaging, especially in locally recurrent pancreatic cancer patients. The need for improvement in precise tumor detection and delineation led us to innovatively use the novel FAPI-PET/CT for radiation treatment planning. (2) Methods: Gross tumor volumes (GTVs) of seven locally recurrent pancreatic cancer cases were contoured by six radiation oncologists. In addition, FAPI-PET/CT was used to automatically delineate tumors. The interobserver variability in target definition was analyzed and FAPI-based automatic GTVs were compared to the manually defined GTVs. (3) Results: Target definition differed significantly between different radiation oncologists with mean dice similarity coefficients (DSCs) between 0.55 and 0.65. There was no significant difference between the volumes of automatic FAPI-GTVs based on the threshold of 2.0 and most of the manually contoured GTVs by radiation oncologists. (4) Conclusion: Due to its high tumor to background contrast, FAPI-PET/CT seems to be a superior imaging modality compared to the current gold standard contrast-enhanced CT in pancreatic cancer. For the first time, we demonstrate how FAPI-PET/CT could facilitate target definition and increases consistency in radiation oncology in pancreatic cancer. | ||
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