Hypofractionated Proton Beam Radiotherapy for Hepatocellular Carcinoma

"\- Prescription dose to PTV as according to the following dose escalation schema: Arml 1: 60 GyE /10 fx, 6GyE fraction dose, 5 days/week, for HCC free from the alimentary tract (i.e., stomach, duodenum, esophagus, small and large bowel) (more than 2cm from clinical target volume), TLV30 \<40%, and/or RLV30 \<30%) Arm 2: 50 GyE /10 fx, 5GyE fraction dose, 5 days/week, for HCC close to the alimentary tract (less than 2cm from clinical target volume) but not contact with the alimentary tract, TLV30\<50% and RLV30\<40% Arm 3: 35 GyE /10 fx, 4GyE fraction dose, 5 days/week, for HCC contact to the alimentary tract (contact with clinical target volume), TLV30\<60%, and/or RLV30\<50%~\- Dose prescription : 95% isodose volume of prescribed dose encompassed PTV"