Management and Treatment for Radiation-Induced Colitis

Interventions: Heavy-ion radiation therapy 73.6Gy/16fr/4weeks Primary outcome(s): The frequency and severity of radiation-induced colitis that occurs within two years after heavy ion therapy Study Design: Single arm Non-randomized干预措施：重离子放射治疗（Heavy-ion radiation therapy），总剂量73.6戈瑞，分16次照射，疗程4周 主要结局指标：重离子治疗后2年内发生的放射性结肠炎的发生率与严重程度 研究设计：单臂非随机化研究（Single arm Non-randomized）