113 years ago today, on August 13, 1912 (July 1, 1912 in the lunar calendar), French doctors discovered cancer cells. Cancer cells are mutated cells and the source of cancer. Unlike normal cells, cancer cells have three characteristics: infinite proliferation, transformation and easy metastasis. They can proliferate endlessly and destroy normal cell tissues. Therefore, it is difficult to eliminate. (The heart muscle is almost unaffected by cancer) On August 13, 1912, Paris doctor Gaston Odin announced that he had discovered, isolated and cultured cancer cells. Odin said cancer cells are flat and composed of colloidal bodies with a core in the center and irregular around them. As it grows, the cancer will spread in all directions. He started studying cancer cells ten years ago. After hard work, we finally achieved success in the previous six months. To date, cancer is still one of the leading causes of death that plagues us. The medical community still has not found the cause of cancer, and there are no particularly effective drugs that can completely treat cancer. In fact, cancer is not far away from us. In daily life, you often hear the sad news of which relatives or friends have developed cancer. Despite incomplete statistics, 600,000 people are diagnosed with lung cancer every year in our country, and lung cancer has become the first among cancers. In medicine, cancer refers to a malignant tumor originating from epithelial tissue and is the most common type of malignant tumors. The term "cancer" generally refers to all malignant tumors. Once cancer is formed in the human body, it will not stop growing. It grows quickly, grows infiltrates, is prone to necrosis, ulcers, etc., and is accompanied by distant metastasis, causing weight loss, weakness, anemia, loss of appetite, fever and severe organ function impairment, etc., ultimately leading to the patient's death. Although the cause of cancer has not been fully understood by us, after years of research, experiments and clinical observation by doctors and scientific researchers, it has been found that environment and behavior have an important impact on the occurrence of cancer. It is estimated that more than 80% of all cancers are related to environmental factors. Environmental pollutants that cause human cancer can pollute the environment through air, water and soil. The carcinogens are widespread, including lungs, skin, bladder, larynx, ovaries, nasopharynx, kidney and hematopoietic system. The International Alliance against Cancer believes that one-third of cancers are preventable, one-third of cancers can be cured if diagnosed early, and one-third of cancers can reduce pain and extend life. Based on this, the concept of tertiary prevention of cancer has been proposed internationally. Primary prevention is to eliminate or reduce factors that may cause cancer and prevent the occurrence of cancer. About 80% of cancers are related to the environment and living habits. Improving living habits, such as quitting smoking, can prevent the occurrence of many cancers. Secondary prevention refers to how to detect cancer at an early stage and treat it in a timely manner once it occurs. It is necessary to conduct regular inspections of high-risk areas and high-risk groups. Three-level treatment is rehabilitation after treatment, improving quality of life, reducing pain, and extending life.