PET/CT Imaging of NSCLC with a αvβ6 Integrin-Targeting Peptide View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-01-22

AUTHORS

Paul Flechsig, Thomas Lindner, Anastasia Loktev, Saskia Roesch, Walter Mier, Max Sauter, Michael Meister, Christel Herold-Mende, Uwe Haberkorn, Annette Altmann

ABSTRACT

PURPOSE: Targeted therapies are regarded as promising approaches to increase 5-year survival rate of non-small cell lung cancer (NSCLC) patients. Here, we investigated the clinical value of the αvβ6 integrin-specific peptide SFITGv6 as a diagnostic reagent targeting NSCLC. METHODS: Affinity and binding properties of [125I]SFITGv6 or [177Lu]SFITGv6 for αvβ6 integrin-expressing NSCLC cell lines were evaluated in cell culture experiments including competition, kinetic, internalization, and efflux. To confirm αvβ6 integrin specificity in vivo small-animal positron emission tomography (PET) imaging using [68Ga]SFITGv6 as radiotracer and biodistribution of [177Lu]SFITGv6 in NCI-H2009 and NCI-H322 tumor-bearing mice was performed. Finally, to distinguish between benign and malignant lesions [68Ga]SFITGv6 was applied as radiotracer for PET/x-ray computed tomography (CT) imaging of NSCLC patients with unclear diagnosis upon routinely performed 2-deoxy-2-[18F]flouro-D-glucose ([18F]FDG)-PET/CT. The biodistribution of the SFITGv6-ligand in different organs and tumor lesions of NSCLC patients was quantified 1 h and 3 h after injection measuring standard uptake values (SUV)max. RESULTS: In vitro experiments revealed a significant time-dependent SFITGv6 binding of up to 33 % to αvβ6 integrin-expressing the cell lines NCI-H2009, NCI-H322, NCI-H292, NCI-H358, and high affinity (IC50-mean 3.1 nM) to NCI-H2009 and NCI-H322. Moreover, a fast internalization of approximately 66 % by NCI-H2009 and NCI-H322 cells was observed. Small-animal PET imaging and biodistribution experiments of NCI-H2009 and NCI-H322 xenografts demonstrated an increased tumor-specific accumulation of SFITGv6 40 to 60 min after injection. Finally, PET/CT scans of NSCLC patients after [18F] FDG injection followed by [68Ga]SFITGv6 application revealed correlating images. Comparing the uptake of [68Ga]SFITGv6 and [18F] FDG both PET/CT-examinations presented with significantly increased SUVmax values in histologically proven NSCLC lesions, but a generally higher accumulation of [18F] FDG was noticed. CONCLUSIONS: Even if SFITGv6 demonstrates excellent affinity and specificity for αvβ6 integrin-expressing NSCLC cell lines and several NSCLC xenografts [18F]FDG-PET/CT provides an advantage over [68Ga]SFITGv6-PET/CT for the diagnosis of NSCLC patients. More... »

PAGES

1-11

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11307-018-1296-6

DOI

http://dx.doi.org/10.1007/s11307-018-1296-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1111610332

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30671741


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