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肺癌的发病率日益增高,治疗不外乎手术、放射及药物等,能够治愈的方法只有手术和放射两种。手术和放射均为局限性治疗方法。肺癌的症状明显时,往往已有远处亚临床转移,因此,手术、放射效果都很差。手术治疗因受体质和解剖部位的限制,只能用于早期病例,而早期的病例数相对较少。据美国联合委员会统计,约29％的肺癌为Ⅰ期,7％为Ⅱ期,而64％为晚期病例。所以占肺癌绝大多数的中、晚期病例均能用放射治疗,特别自高能射线使用以来,放射治疗在肺癌的治疗中,占十分重要的地位。由于放射对放射野外的亚临床转移
The incidence of lung cancer is increasing, and the treatment is nothing more than surgery, radiation and drugs. The only methods that can be cured are surgery and radiation. Surgery and radiation are both limitations of treatment. When the symptoms of lung cancer are obvious, they often have distant subclinical metastases. Therefore, the effects of surgery and radiation are very poor. Surgical treatment can only be used in early cases because of the limitations of the recipient’s quality and anatomic site, and the number of early cases is relatively small. According to the statistics of the United States Joint Commission, about 29% of lung cancers are stage I, 7% are stage II, and 64% are advanced cases. Therefore, the vast majority of lung cancer cases in the middle and late can be treated with radiation, especially since the use of high-energy radiation, radiation therapy in the treatment of lung cancer, accounting for a very important position. Subclinical metastasis due to radiation versus radiation