PT - JOURNAL ARTICLE AU - Johannes Notni AU - Dominik Reich AU - Oleg V. Maltsev AU - Tobias G. Kapp AU - Katja Steiger AU - Frauke Hoffmann AU - Irene Esposito AU - Wilko Weichert AU - Horst Kessler AU - Hans-Jürgen Wester TI - In Vivo PET Imaging of the Cancer Integrin αvβ6 Using <sup>68</sup>Ga-Labeled Cyclic RGD Nonapeptides AID - 10.2967/jnumed.116.182824 DP - 2017 Apr 01 TA - Journal of Nuclear Medicine PG - 671--677 VI - 58 IP - 4 4099 - http://jnm.snmjournals.org/content/58/4/671.short 4100 - http://jnm.snmjournals.org/content/58/4/671.full SO - J Nucl Med2017 Apr 01; 58 AB - Expression of the cellular transmembrane receptor αvβ6 integrin is essentially restricted to malignant epithelial cells in carcinomas of a broad variety of lineages, whereas it is virtually absent in normal adult tissues. Thus, it is a highly attractive target for tumor imaging and therapy. Furthermore, αvβ6 integrin plays an important role for the epithelial–mesenchymal interaction and the development of fibrosis. Methods: On the basis of the 68Ga chelators TRAP (triazacyclononane-triphosphinate) and NODAGA, we synthesized mono-, di-, and trimeric conjugates of the αvβ6 integrin–selective peptide cyclo(FRGDLAFp(NMe)K) via click chemistry. These were labeled with 68Ga and screened regarding their suitability for in vivo imaging of αvβ6 integrin expression by PET and ex vivo biodistribution in severe combined immunodeficiency mice bearing H2009 tumor (human lung adenocarcinoma) xenografts. For these, αvβ6 integrin expression in tumor and other tissues was determined by β6 immunohistochemistry. Results: Despite the multimers showing higher αvβ6 integrin affinities (23–120 pM) than the monomers (260 pM), the best results—that is, low background uptake and excellent tumor delineation—were obtained with the TRAP-based monomer 68Ga-avebehexin. This compound showed the most favorable pharmacokinetics because of its high polarity (log D = –3.7) and presence of additional negative charges (carboxylates) on the chelator, promoting renal clearance. Although tumor uptake was low (0.65% ± 0.04% injected dose per gram tissue [%ID/g]), it was still higher than in all other organs except the kidneys, ranging from a maximum for the stomach (0.52 ± 0.04 %ID/g) to almost negligible for the pancreas (0.07 ± 0.01 %ID/g). A low but significant target expression in tumor, lung, and stomach was confirmed by immunohistochemistry. Conclusion: Because of highly sensitive PET imaging even of tissues with low αvβ6 integrin expression density, we anticipate clinical applicability of 68Ga-avebehexin for imaging of αvβ6 tumors and fibrosis by PET.