Because in situ cancer is in the early stage of cancer, the prognosis is mostly better after surgical treatment, which is usually curable and has little impact on life expectancy. Malignant tumors can be staged according to the extent of tumor invasion, size of the mass, whether there are lymphatic metastasis and distant organ metastasis. Carcinoma in situ is the earliest staged malignant tumor, which refers to cancer cells still staying in the epithelium and not breaking through the basement membrane to invade other tissues and organs, and belongs to the early clinical stage of cancer, so early resection can achieve clinical cure and is the preferred clinical plan. After surgery, patients need to pay attention to regular review to clarify the treatment situation and prevent recurrence. Patients are advised to do more physical exercise in life to enhance physical fitness and improve immunity, as well as to maintain a positive and healthy attitude, and have the confidence and courage to overcome the disease, so that they can enjoy a higher quality of life.