The RSSearch® Registry is an international multi-year database designed to track SRS/SBRT (Stereotactic Radiosurgery/Stereotactic Body Radiation Therapy) utilization, treatment practices and outcomes to help determine, over time, the most effective use of these systems in management of patients with life threatening tumors and other diseases. (This study was formally called ReCKord and included the CyberKnife only; The ReCKord study continues as a CyberKnife subset of RSSearch.)