 - Subjects must have confirmed diagnosis of unresectable hepatocellular carcinoma HCC categorized to stage C based on Barcelona Clinic Liver Cancer BCLC staging system with any of following criteria: 1 Lesion limited to a single lobe that is within the radiotherapy field, 2 Lesion not limited to a single lobe, but the lesion that is not within the radiotherapy field can be controlled by transarterial chemoembolization or radiofrequency ablation, 3 Presence of metastatic lesions that measure 1.0 cm in the long axis, 4 The lesion can be accurately measured in at least one dimension as 1.0 cm 