肺是人体的呼吸器官，位于胸腔，左右各一，覆盖于心之上。肺有分叶，左二右三，共五叶。肺经肺系（指气管、支气管等）与喉、鼻相连，故称喉为肺之门户，鼻为肺之外窍。肺的形态依空气充盈程度和胸廓的形状而变化，一般为圆锥形。
Lung is the respiratory organ of the human body, located in the chest cavity, one on the left and one on the right, covering the heart above. The lungs are lobed, with two lobes on the left and three on the right, totaling five lobes. The lungs are connected to the throat and nose through the respiratory tract (trachea, bronchi, etc.), so the throat is called the gateway of the lungs and the nose is the external orifice of the lungs. The shape of the lungs varies depending on the degree of air filling and the shape of the chest cavity, and is generally conical.
肺癌是发病率和死亡率增长最快，对人群健康和生命威胁最大的恶性肿瘤之一。肺癌早期症状常较轻微，甚至可无任何不适。中央型肺癌症状出现早且重，周围型肺癌症状出现晚且较轻，甚至无症状，常在体检时被发现。
Lung canceris one of the malignant tumors with the fastest growth in incidence and mortality, posing the greatest threat to human health and life. Early symptoms of lung cancer are often mild or even absent. Central lung cancer symptoms appear early and are severe, while peripheral lung cancer symptoms appear late and are relatively mild, or even absent, often discovered during physical examinations.
病例解析（Case Analysis）
患者信息：63岁，男性
诊 断：肺癌术后，肿瘤标记物异常，确诊为肿瘤复发
治疗情况：细胞免疫治疗2.5个月后，癌巢缩小
Patient Information: 63 years old, male
Diagnosis: Post-lung cancer surgery, abnormal tumor markers, confirmed as tumor recurrence
Treatment: After 2.5 months of cellular immunotherapy, the cancer nest shrank
经验分享：肿瘤患者的自身免疫功能较差，通过NK细胞免疫治疗回输大量的NK细胞后，可以很大程度的提高患者免疫系统机能，增强自身攻击肿瘤细胞的能力，因此，患者在术后应及早进行NK细胞免疫治疗。
Experience Sharing: Tumor patients often have poor immune function. By infusing a large number of NK cells through NK cellular immunotherapy, the patient's immune system function can be greatly improved, enhancing their ability to attack tumor cells. Therefore, patients should undergo NK cellular immunotherapy as early as possible after surgery.
细胞免疫治疗是指将体外激活、扩增的自体或异体免疫效应细胞输注给患者，以杀伤体内的肿瘤细胞。对于细胞免疫功能低下的肺癌患者，如大剂量化疗、放疗后、自体外周血干细胞移植后、病毒感染损伤免疫细胞数量及功能的患者，可考虑细胞免疫治疗。
Cellular immunotherapy refers to the infusion of autologous or allogeneic immune effector cells that have been activated and expanded in vitro into the patient to kill tumor cells in the body. For lung cancer patients with low cellular immune function, such as those after high-dose chemotherapy, radiotherapy, autologous peripheral blood stem cell transplantation, or viral infections that damage the number and function of immune cells, cellular immunotherapy can be considered.
在日常生活中我们要注意以下几点，可对肺癌进行有效的预防：
In daily life, we should pay attention to the following points to effectively prevent lung cancer:
1、戒烟（Quit Smoking）
国际研究已经证明，戒烟能明显降低肺癌的发生率，且戒烟越早肺癌发病率降低越明显。可以说，戒烟是预防肺癌最有效的途径。
International research has proven that quitting smoking can significantly reduce the incidence of lung cancer, and the earlier smoking cessation occurs, the more pronounced the reduction in lung cancer incidence. It can be said that quitting smoking is the most effective way to prevent lung cancer.
2、保护环境（Protect the Environment）
调查数据显示：大气污染、沉降指数、烟雾指数、苯并芘等暴露剂量与肺癌的发生率成正相关，因此保护环境、减少大气污染是降低肺癌发病率的重要措施，个人要注意避免自己长期处于致癌环境中，雾霾天气外出要带防尘口罩。
Survey data shows that exposure doses of air pollution, sedimentation index, smoke index, benzo(a)pyrene, etc., are positively correlated with the incidence of lung cancer. Therefore, protecting the environment and reducing air pollution are important measures to reduce the incidence of lung cancer. Individuals should avoid being exposed to carcinogenic environments for long periods of time, and wear dust masks when going out during hazy weather.
3、科学饮食（Eat a Healthy Diet）
蔬菜、水果中所含的各类维生素及微量元素可帮助我们起到癌症预防的作用，同时可提高人体免疫力，增强自身的抗病能力。日常可多吃清肺食物，例如雪梨、白萝卜、银耳、荸荠、木耳等。
The various vitamins and trace elements contained in vegetables and fruits can help us prevent cancer and also improve our immune system and enhance our ability to resist disease. We can incorporate more lung-cleaning foods into our daily diet, such as pear, white radish, tremella fuciformis, water chestnut, and wood ear mushrooms.
除以上三点外，体育锻炼也是必不可少的防癌措施。日常可选择在空气清新的地方进行跑步、太极等锻炼，长期坚持可改善身体素质，增强体质，提高抗病能力。
Apart from the above three points, physical exercise is also an indispensable measure for cancer prevention. We can choose to run, practice Tai Chi, or engage in other forms of exercise in places with fresh air. Long-term adherence to such exercises can improve our physical fitness, strengthen our constitution, and enhance our ability to resist disease.