Carcinoma in situ usually does not metastasize, and metastasis is rare. Metastasis may occur through hematogenous metastasis or other sites. Carcinoma in situ is the earliest stage of malignant tumor, which does not invade the surrounding tissues and organs and has not metastasized. The clinical stage is stage I. Early surgical excision can achieve clinical cure. After surgery, TCM is used to adjust the patient’s constitution and change the body’s internal environment to prevent tumor recurrence, metastasis and spread. Therefore, regardless of the various stages of tumor, it is possible to cooperate with TCM herbal medicine for evidence-based treatment to enhance the patient’s resistance, consolidate the treatment effect and prevent recurrence and metastasis.