The human integrin avß6, which is usually undetectable in normal adults’ cells, but highly upregulated in different types of cancer, is an emerging target for therapy as well as imaging across several common tumor types. However, only few ligands are known so far that are highly active for avß6 integrin and at the same time possess no binding affinity toward other RGD-recognizing integrins. Furthermore, their metabolic instability, their high molecular weight and the complexity of their structures limit their medical application.
This problem could now be solved by the present invention. The peptides according to the invention show a remarkable affinity for avß6 and high selectivity against other integrins.
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