The three levels of cancer prevention are as follows: 1) primary prevention is prevention from the level of cancer occurrence, through improving life habits, such as quitting smoking, reducing intake of high-calorie diet, environmental management, etc. to remove the causes that induce tumors, called etiological prevention; 2) secondary prevention is early detection and early treatment, the earlier the detection, the easier it is to cure; 3) tertiary prevention is when the tumor enters the middle and late stages, through regular, scientific and reasonable treatment to prolong the survival of patients, improve the quality of life and achieve precise individualized treatment, called tertiary prevention.
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