1.What are the stages of cancer? Normal cells → 1 mild atypical hyperplasia (impaired differentiation) → 2 moderate atypical hyperplasia → 3 severe atypical hyperplasia (carcinoma in situ) → 4 early carcinoma (intramucosal carcinoma) → 5 infiltrative carcinoma → 6 metastatic carcinoma 2.What is carcinoma in situ? It is a state where the malignant tumor of epithelium is confined to the skin or mucous membrane and has not yet invaded the dermis through the basement membrane below the skin or mucous membrane, let alone infiltrated and distant metastasis. Therefore, carcinoma in situ is sometimes called “pre-infiltrative carcinoma” or “stage 0 carcinoma”, and strictly speaking, it is not considered a real cancer at all. An orange has mold on the skin, but after peeling the skin, the orange is still good, and in situ cancer is this mold, and the cure rate is close to 100%. People generally think that having cancer is definitely a major disease, but the insurance terms and conditions state that patients with carcinoma in situ are not covered (in the mainland). In fact, carcinoma in situ is the earliest stage of cancer, and patients with carcinoma in situ have to account for the vast majority of all cancer patients. Carcinoma in situ is an epithelial malignancy confined within the skin or mucous membrane and has not yet invaded the surrounding tissues through the basement membrane beneath the skin or mucous membrane. Cancerous lesions can develop into carcinoma in situ, and if left untreated, they can develop into invasive carcinoma. Carcinoma in situ is the earliest stage of cancer, so it is also called stage 0 cancer, which can be completely cured by surgical excision. 3.Where is in situ cancer likely to occur? Carcinoma in situ is commonly found in the cervix, skin, bronchus, stomach, prostate and breast. 4.What groups are prone to in situ cancer? (1) Those with family genetic factors. Especially breast cancer, stomach cancer, intestinal cancer, liver cancer, esophageal cancer and leukemia, which often have the phenomenon of family gathering. 2）People with bad habits. For example, long-term smokers and alcoholics. (3) Certain chronic diseases related to cancer. Those who suffer from chronic gastritis for a long time, especially atrophic gastritis; cervicitis, cervical erosion; hepatitis B and C; chronic skin ulcers, these diseases may become malignant at a later stage. 4) Occupationally susceptible people. Long-term exposure to chemicals, electromagnetic radiation and other groups. (5) Individuals with special susceptibility. Such as those whose spirit is in long-term depression, sadness, pain, anxiety, self-restraint, are susceptible to diseases and even malignant tumors.