In today''s society, among various causes of death, the mortality rate of cancer remains high and there is a rising trend. Most people "talk about cancer discoloration". In fact, the process of cancer development includes three stages: precancerous lesions, carcinoma in situ, and invasive carcinoma. Therefore, people need to understand some common knowledge about precancerous lesions, and escort the health of themselves and their families. Is lung carcinoma in situ a precancerous lesion?

　　carcinoma in situ Terminology, definition: refers to the heterotypic cells in the epithelial layer of the mucosa or the epidermal layer of the skin involving the whole layer of the epithelium, but has not yet broken through the basement membrane, and no interstitial infiltration growth has occurred. But for ordinary people, speaking this is equivalent to saying that people without a medical foundation can never understand the true meaning of this definition. Therefore, it is necessary to elaborate in popular language that everyone can understand.
　　Carcinoma in situ is not what we usually call "carcinoma". Usually we say XX cancer, which refers to invasive cancer, but when called, it will save the word "invasion", such as breast cancer, in fact it is Invasive breast cancer. The word "in situ" of carcinoma in situ must not be omitted. For example, carcinoma in situ of the breast can not be removed and simply referred to as breast cancer, then it is very wrong! Carcinoma in situ of the breast is not equal to breast cancer, the two are not the same thing at all! Insurance companies generally do not include cancer in situ in the category of claims for serious illnesses, because it is indeed not a serious illness, and it is not a "cancer" in the true sense.
　　 Don’t look at the word "cancer" as if it were the end of the world. Carcinoma in situ can be cut off, and there is generally no need for adjuvant chemotherapy or targeted therapy after surgery. Carcinoma in situ can be regarded as stage 0 cancer (TisN0M0, stage 0).
　　 But it must be noted that sometimes a piece of tumor is part of carcinoma in situ or even in the stage of precancerous lesions, but the other part is already invasive carcinoma, then the final diagnosis is not carcinoma in situ, but (invasive) carcinoma , Its treatment is treated as "cancer", but can not be treated as carcinoma in situ. Therefore, if the pathological diagnosis of puncture biopsy is carcinoma in situ, it is not easy to draw the final conclusion. The entire mass should be further cut off and sent for pathological examination. If it is indeed carcinoma in situ, the mass has been cut off. This is the cure. Follow-up Follow-up review. If there is an infiltrating cancer component, it will be treated as cancer, how to treat it, including surgery, radiotherapy, chemotherapy, targeted therapy, endocrine therapy, etc. Different cancers have different treatment strategies.