Chemotherapy is a very common anti-tumor treatment method. The decision of whether to use chemotherapy or not is mainly based on the nature of the tumor and the pathological stage. If the tumor is very sensitive to chemotherapy, chemotherapy is usually needed, for example, like small cell lung cancer, which is very sensitive and effective through chemotherapy treatment. For example, small cell lung cancer is very sensitive to chemotherapy and has good effect. At the beginning, chemotherapy can also play a role in controlling the development of the disease and prolonging the survival. There are also things like lymphoma and leukemia that may be treated mainly with chemotherapy, so these definitely need chemotherapy. For those who do not need chemotherapy, there are two types of cases, one is early stage cancer in situ, which does not need chemotherapy. There is another kind of patients who are unwilling to receive chemotherapy or are in poor health condition and cannot tolerate chemotherapy, this kind of patients also do not need chemotherapy. If chemotherapy can be given, it is better to try to give chemotherapy. In addition to chemotherapy, there are also local radiotherapy and targeted drugs and other treatment modalities.