It is not easy to cure. The median survival time of limited-stage small cell lung cancer is 12-18 months, and the median survival time of extensive-stage lung cancer is 6-10 months. When lung cancer occurs, especially in the late stage, cancer cells consume a large amount of human body substances and energy. , leading to insufficient acquisition of substances and energy in the liver and normal human cells, and reducing immunity. Therefore, lung cancer patients must strengthen nutrition and maintain the body's immunity in order to better resist cancer cells.