Tsang Wai Kuen died of lung cancer, why can't lung cancer be cured?

Wai Kuen Tsang died of lung cancer. Lung cancer is a malignant tumor that originates in the lungs, i.e., a malignant tumor that originates on the bronchial tubes or alveoli, which is also known as primary bronchoalveolar carcinoma. There are two kinds of primary lung tumors, one is benign lung tumor with good prognosis, which can be cured by surgery or conservative treatment and cannot be called lung cancer. One type is malignant tumor of lungs, which can be other malignant tumors occurring in lungs, such as lymphoma, or metastatic tumors occurring in lungs, such as breast cancer, stomach cancer, liver cancer, etc. Excluding the above cases, it can be called lung cancer.

Daily symptoms include cough, sputum, coughing up blood, dyspnea and chest pain. In severe cases, it is associated with complications such as superior vena cava obstruction syndrome, Horner's syndrome, hypertrophic pulmonary osteoarthropathy, Cushing's syndrome, neuromuscular syndrome, hypercalcemia, and brachial plexus nerve compression syndrome, etc. The treatment cycle is long and continuous. It often occurs in adults, smokers, long-term exposure to occupational carcinogens, long-term exposure to polluted air, with high genetic factors of the disease commonly used drugs cisplatin, gefitinib commonly used examination chest X-ray, chest CT, sputum exfoliative cytology, bronchoscopy, and other work engaged in the personnel.

Since there are no specific symptoms in the early stage of lung cancer, especially patients who have smoked a lot for a long time, or have chronic bronchitis, they usually have symptoms such as chronic coughing and coughing up sputum. Most people do not pay attention to regular medical checkups every year, and go to the hospital only when they have pain, blood in sputum or hemoptysis. Often, by this time, lung cancer has already reached the middle or late stage, and most of them have already lost the chance of surgical resection. Most of them have already lost the chance of surgical resection. Therefore, if found late, lung cancer cannot be cured, but only try to control the tumor and prolong the patient's life. There are also a few patients whose tumors are still in the early stage when they are found, or even carcinoma in situ, which is very likely to be cured through surgical resection.

The principle of the pathogenesis of lung cancer has not been answered so far, but there are evidences that the occurrence of lung cancer is related to smoking, air pollution, occupational carcinogenic factors, diet, heredity and other factors. In general, genetic factors and environmental factors*** are involved in its development.