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30例肺癌患者手术前后NK细胞和T细胞亚群测定结果提示：肺癌患者的免疫状态和肿瘤的大小呈负相关。说明这种免疫抑制机理是肿瘤源性的。肿瘤切除后，其免疫功能明显改善。免疫功能低下和肺癌存在因果关系。
The results of NK cell and T cell subsets before and after surgery in 30 lung cancer patients showed that the immune status of lung cancer patients was inversely related to the size of the tumor. This shows that this immunosuppressive mechanism is tumor-derived. After tumor resection, its immune function improved significantly. There is a causal relationship between low immune function and lung cancer.