There is no clinical statement that immunotherapy can be done for a maximum of 2 years. Immunotherapy is mainly used to enhance or suppress the immune function of the body to achieve the purpose of treatment. The duration of immunotherapy depends on the specific type of disease, as well as the physical condition of the patient. For example, the application of immunotherapy in allergic asthma and rheumatic immune diseases needs to be decided according to the patient’s condition and clinical efficacy, and sometimes the duration of treatment may be longer than 2 years. In addition, immunotherapy is commonly used in cancer patients clinically, such as liver cancer and gastric cancer, which is an important means to control the progression of advanced cancer. It can activate the immune system in the body of tumor patients through immunotherapy, lift the immune suppression of tumor cells on the body, and enable the patients themselves to maintain certain immune function to resist the development of tumor tissues in order to achieve the treatment purpose. However, the price of immunotherapy for cancer is high and the average family cannot support it for a long time, so there may be the saying that the maximum of 2 years is done because of the economic condition. It is recommended to listen to professional doctor’s advice to decide the duration of treatment. For example, some patients have not reached 2 years of treatment time during immunotherapy and their condition has improved, in this case, whether immunotherapy can be stopped, or whether the condition has not improved significantly and whether the course of treatment needs to be extended, etc.