Soluble mic polypeptides as markers for diagnosis, prognosis and treatment of cancer and autoimmune diseases or conditions

摘要

The present invention provides prognostic and diagnostic methods for cancer, as well as methods for monitoring or staging cancer. Methods involve assaying for tumor-derived soluble MIC polypeptide-either MICA or MICB or both-in a sample from a subject. Assays can be implemented with a MIC polypeptide binding agent such as a MIC polypeptide antibody or recombinant NKG2D. An ELISA sandwich assay is employed in some embodiments of the invention to identify a soluble MIC polypeptide. In additional embodiments, a sample is assayed for tumor cell-surface bound MIC in addition to assaying for soluble MIC. The invention also provides methods of cancer therapy involving detecting cancer in the subject by assaying for soluble MIC polypeptide and then administering a cancer therapy.