Sirtex Medical Inc. has announced the development and implementation of the Centers of Excellence (COE) Program. The COE designation recognizes premier hospitals and medical centers in the United States that have made significant contributions to interventional oncology research and clinical practice, including the use of SIR-Spheres microspheres. Manufactured by Sirtex, SIR-Spheres microspheres are the only FDA-approved radioactive microsphere therapy for the treatment of colorectal liver metastases.