The invention provides RGD-containing cyclic peptidomimetics； conjugates of said peptidomimetics and a moiety of a payload selected from fluorescent probes, photosensitizers, chelating agents, or cytotoxic agents； and pharmaceutical compositions comprising these conjugates. The conjugates of the invention are useful both for diagnostic purposes and treatment of various diseases, disorders and conditions. More specifically, conjugates comprising fluorescent probes can be used for diagnostic purposes, e.g., visualization of organs and tissues, and diagnosis of tumors； conjugates comprising photosensitizers can be used for photodynamic therapy of both tumors and nonneoplastic tissues； conjugates comprising chelating agents can be used in radio imaging or radiotherapy； and conjugates comprising cytotoxic agents can be used for in targeted chemotherapy.
