FAP-specific signalling is an independent diagnostic approach in ACC and not a surrogate marker of MRI sequences
Background: Fibroblast Activation Protein (FAP) is a new target for positron emission tomography and computed tomography (PET/CT) imaging of epithelial tumours embedded in a fibrous stroma. Adenoid cystic carcinomas (ACCs) have shown elevated tracer uptake in 68Gallium (68Ga)-labelled FAPIs in previ...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
31 August 2022
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| In: |
Cancers
Year: 2022, Jahrgang: 14, Heft: 17, Pages: 1-12 |
| ISSN: | 2072-6694 |
| DOI: | 10.3390/cancers14174253 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/cancers14174253 Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2072-6694/14/17/4253 
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| Verfasserangaben: | Dawn P. Liew, Manuel Röhrich, Lisa Loi, Sebastian Adeberg, Mustafa Syed, Ewgenija Gutjahr, Heinz Peter Schlemmer, Frederik L. Giesel, Martin Bendszus, Uwe Haberkorn and Daniel Paech |
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| 245 | 1 | 0 | |a FAP-specific signalling is an independent diagnostic approach in ACC and not a surrogate marker of MRI sequences |c Dawn P. Liew, Manuel Röhrich, Lisa Loi, Sebastian Adeberg, Mustafa Syed, Ewgenija Gutjahr, Heinz Peter Schlemmer, Frederik L. Giesel, Martin Bendszus, Uwe Haberkorn and Daniel Paech |
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| 520 | |a Background: Fibroblast Activation Protein (FAP) is a new target for positron emission tomography and computed tomography (PET/CT) imaging of epithelial tumours embedded in a fibrous stroma. Adenoid cystic carcinomas (ACCs) have shown elevated tracer uptake in 68Gallium (68Ga)-labelled FAPIs in previous studies. The current gold standard for ACC imaging is contrast-enhanced (ce) MRI, where intertumoural heterogeneity leads to variable appearance on T1-weighted (T1w) and T2-weighted (T2w) images. In this retrospective analysis, we correlated 68Ga-FAPI PET signalling at three time points with ceT1w and T2w MRI signals to further characterise the significance of 68Ga-FAPI uptake in ACCs. Methods: Clinical PET/CT scans of 12 ACC patients were performed at 10, 60 and 180 min post i.v. administration of 68Ga-labelled-FAPI tracer molecules. 68Ga-PET- and corresponding MRI-scans were co-registered, and 3D volumetric segmentations were performed on ceT1w and T2w lesions of co-registered MRI slides. Signal intensity values of 68Ga-FAPI PET signalling and ceT1w/T2w MRI scans were analysed for their pixelwise correlation in each patient. Pooled estimates of the correlation coefficients were calculated using the Fisher z-transformation. Results: 68Ga-FAPI PET signals showed a very weak positive correlation with ceT1w values (pooled correlation 0.114, 0.147 and 0.162 at 10, 60 and 180 min) and a weak negative correlation with T2w values (pooled correlation −0.148, −0.121 and −0.225 at 10, 60 and 180 min). Individual r-values at 60 min ranged from −0.130 to 0.434 in ceT1w and from −0.466 to 0.637 in T2w MRI scans. Conclusion: There are only slight correlations between the intensity of 68Ga-FAPI PET signals and tumour appearance in ceT1w or T2w MRI scans, which underlines that 68Ga-FAPI PET signalling is not a surrogate marker of MRI sequences but an independent signal. | ||
| 650 | 4 | |a ACC | |
| 650 | 4 | |a adenoid cystic carcinoma | |
| 650 | 4 | |a FAP | |
| 650 | 4 | |a fibroblast activation protein | |
| 650 | 4 | |a MRI | |
| 650 | 4 | |a pixelwise correlation | |
| 650 | 4 | |a positron emission tomography | |
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