直肠癌的放射治疗可概括分为四大类,即:术后系统性放疗;早期病例的接触治疗;术前放疗;对晚期及复发性病例的放疗。1.术后放疗:在1929年前 Regaud 认为巨大的腺癌对射线不敏感,不能获得均匀的剂量、而又影响其附近的小肠,因此对直肠癌的放疗持否定态度。由于利用硬线和韧致幅射线作术后残余灶的放疗,如用5000—6000rads,可以对小块残余及淋 Radiotherapy for rectal cancer can be broadly divided into four major categories, namely: postoperative systemic radiotherapy; contact treatment in early cases; preoperative radiotherapy; and radiotherapy for advanced and recurrent cases. 1. Postoperative radiotherapy: Before 1929, Regaud thought that a huge adenocarcinoma was insensitive to radiation and could not obtain a uniform dose, but it also affected the nearby small intestine. Therefore, it has a negative attitude toward radiotherapy for rectal cancer. Due to the use of hard line and remanence radiation for postoperative residual radiotherapy, such as with 5000-6000rads, small residual and shower can be