RecruitingRadiation therapyvGRID SBRT: A Phase I Clinical Trial in Unresectable or Metastatic HCCThis trial will provide the maximum tolerated dose for radiation therapy for liver tumors and describe the toxicity profile using the vGRID therapy technique. Based on trials using this type of radiation in other cancers demonstrating low toxicity rates even with very high radiation doses and high efficacy, it is likely that vGRID therapy in this trial will be well tolerated and allow dose escalation beyond currently common doses for liver tumors.