Abstract: The present invention describes a uPAR (urokinase Plasminogen Activator Receptor)-targeting conjugate comprising: —a fluorophore; —a molecule binding to the receptor; and—a linker group which covalently links the fluorophore to the molecule binding to the receptor, said linker group either being part of the molecule binding to the receptor or being a separate component of the uPAR (urokinase Plasminogen Activator Receptor)-targeting conjugate; wherein the uPAR (urokinase Plasminogen Activator Receptor)-targeting conjugate has a pharmacokinetic profile where a human TBR (tumor-to-background ratio) of at least 1.1 is reached within 3.5 hours post administration and where a human TBR of at least 1.5 is maintained at least 30 minutes before decreasing below 1.5, and wherein the uPAR-targeting conjugate is a human uPAR-targeting conjugate.

Abstract: The present invention describes a composition comprising a fluorophore labelled uPAR-targeting component, a buffer and a surfactant, wherein the fluorophore labelled uPAR-targeting component is solubilized in the composition by means of the surfactant being present, and wherein the composition comprises a maximum of 10 wt % water, preferably a maximum of 5 wt % water.

Abstract: There is provided a novel conjugate that binds to the cell surface receptor uPA (uPAR). The conjugate is based on a fluorescence-labeled peptide useful as a diagnostic probe to the surfaces of cells expressing uPAR. The conjugate is capable of carrying a suitable detectable and imageable label that will allow qualitative detection and also quantitation of uPAR levels in vitro and in vivo. This renders the surgical resection of tumors more optimal.