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术前放疗 (一)目的——提高根治切除率,减少淋巴结转移,防止医源性播散。 (二)病例选择 1.可作手术切除的病人,(肿瘤大小>2×2cm以上)。设对照组 (三)放疔工具用高能射线。如~(60)CO,加速器。 (四)方案 1.腹部凸形前后野相对照射,包括原发灶,及区域淋巴引流,上界达腰2,下界达闭孔底,剂量4000拉得/4～4 1/2周,前野剂量占2/5,后野占3/5,放疗后4周手术。(见图1) 2.放疗+化疗
Preoperative radiotherapy (a) Objective - to increase radical resection rate, reduce lymph node metastasis and prevent iatrogenic dissemination. (b) Case selection 1. Patients who can be surgically removed (tumor size >2 x 2cm or more). Let the control group (3) use high-energy rays to place tools. Such as ~ (60) CO, accelerator. (IV) Option 1. Abdominal convex front and back field relative illumination, including the primary tumor, and regional lymphatic drainage, the upper boundary reaching the lumbar 2 and the lower boundary reaching the obturator bottom, the dose 4000 is drawn/4 to 4 1/2 weeks. The dose is 2/5, the posterior field is 3/5, and 4 weeks after radiotherapy. (See Figure 1) 2. Radiotherapy + Chemotherapy