肿瘤都具有抗原性,宿主对肿瘤的反应在组织学上以伴有免疫反应为特征。现已肯定小淋巴细胞同免疫活动有密切关系,由于放射线可阻止淋巴细胞繁殖,势必损及机体对肿瘤的免疫反应。另一方面,当颈淋巴结发生转移时,大多数情况真正受累者仅少数淋巴结,即便是最容易转移的癌也如此,故当颈部放射时,被照射的淋巴结实际上大多数是无癌的。 Tumors are all antigenic, and the response of the host to the tumor is histologically characterized by an immune response. It has been affirmed that small lymphocytes and immune activity are closely related, because radiation can prevent lymphocyte proliferation, bound to damage the body’s immune response to the tumor. On the other hand, when the cervical lymph node metastases, in most cases the real affected only a few lymph nodes, even the most easily metastasized cancer, so when the neck radiation, the irradiated lymph nodes actually most of the cancer-free .