鼻咽癌是我国常见的一种恶性肿瘤,又以南方为甚。绝大多数鼻咽癌对放射治疗敏感,鼻咽癌首选放疗。但大部分鼻咽癌患者就诊时往往已属于中晚期,单纯放疗效果差,5年生存率在40%以下,远处转移率高达36%～40% ;局部复发和远处转移是治疗失败的主要原因。同期放化疗治疗中晚期鼻咽癌生物学意义主要表现在:①化疗提高了放射 Nasopharyngeal carcinoma is a common malignant tumor in our country, especially in the South. The vast majority of nasopharyngeal carcinoma sensitive to radiation therapy, nasopharyngeal cancer preferred radiotherapy. However, the majority of NPC patients are often in the advanced stage of treatment, the radiotherapy alone is poor, 5-year survival rate below 40%, distant metastasis rate as high as 36% to 40%; local recurrence and distant metastasis is the treatment failed main reason. The same period of radiotherapy and chemotherapy in the treatment of advanced nasopharyngeal carcinoma biological significance mainly in: ① chemotherapy to improve radiation