A Dose-finding, Safety and Preliminary Efficacy Study of Stereotactic Radiosurgery for Hepato-cellular Carcinoma and Metastatic Disease to the Liver.

Radiation: Stereotactic Radiosurgery using the CyberKnife System. The CyberKnife system has been cleared by the U.S. Food and Drug Administration (FDA) to treat lesions, tumors and conditions, anywhere in the body when radiation treatment is indicated. To address movement of target lesion during the respiratory cycle, the Synchrony™ option will be used. The Synchrony option precisely tracks tumors in or near the target organ as they move, enabling the highly focused beams of radiation to destroy the tumors with minimal injury to adjacent normal tissue. The Synchrony option records the breathing movements of a patient's chest and combines that information with sequential x-ray pictures of tiny markers inserted inside or in the proximity of the tumor to enable precise delivery of radiation during any point in the respiration cycle. The CyberKnife system with the Synchrony option enables reduced normal tissue exposure by using smaller treatment margins and increased accuracy.