The present invention provides conjugates useful for the diagnosis and treatment of diseases associated with the over-expression of COX-2. The conjugates comprise a selective COX-2 targeting carrier, a metal coordinating moiety, and a linker chemically linking the metal coordinating moiety to the carrier. The metals coordinated by the metal coordinating moiety are selected from paramagnetic or radioisotopes. The invention also includes kits comprising a conjugate and a radioisotope solution.