Novel .sup.18F-labelled tetrazines are provided which are highly reactive to be effective in vivo, suitable for pretargeted positron emission tomography (PET) and accessible in radiochemical yields (RCYs) which allow access to .sup.18F-labeled tetrazines for clinical applications. The .sup.18F-labelled tetrazines are developed using a Cu-mediated click indirect labelling approach. Only a subset of compounds appeared to be suitable for clinical pretargeted imaging strategies, and a particular compound which includes the use of an .sup.18F-labelled azide synthon having an azide structure with glucose as the linker and a triazole moiety within the linker, appears to be highly suited for clinical pretargeted imaging purposes.

Antibodies and antigen-binding fragments of antibodies that bind GCC are disclosed. In some embodiments, the antibodies are humanized, chimeric or human. Nucleic acids and vectors encoding the antibodies or portions thereof, recombinant cells that contain the nucleic acids, and compositions comprising the antibodies or antigen-binding fragments are also disclosed. The invention also provides therapeutic and diagnostic methods utilizing the antibodies and antigen-binding.

Provided herein are antagonists or binding agents of an abnormal vasopressin receptor V.sub.2 (e.g., AbnV.sub.2), such as antibodies and antigen-binding portions thereof specific for the receptor, for identifying and targeting cancer cells expressing such abnormal vasopressin receptor V.sub.2. Additionally provided are methods of using said antagonists or binding agents, for example, to image cancer cells or in biological samples, or diagnose cancers, both in vivo and in vitro. The antagonists or binding agents may also be used for treating patients suffering from a cancer expressing the abnormal vasopressin receptor V.sub.2, such as small cell lung cancer (SCLC), breast cancer, or ovarian cancer.

Proteomic methods for identifying cancer related proteins and related products and kits are provided. The cancer specific proteins are extracellular matrix proteins that are associated with various aspects of cancer. Panels or signature sets of proteins useful in the detection, diagnosis and treatment of cancers as well as monitoring therapeutic progress in a cancer patient are provided herein along with methods for their detection and for their use in targeting imaging and/or therapeutic agents to the tumors via binding to the specified proteins. The proteins were identified using proteomics analyses of tissue samples taken from cancer patients. In certain aspects the proteins are particularly useful in colon cancer patients.

Antibodies that specifically bind to an epitope on the extracellular domain of TEM7R are provided. Nucleic acids encoding such antibodies and cells capable of expressing such antibodies are also provided. The antibodies may be used in methods for treating tumors and for inhibiting angiogenesis in tumors.