Immunotherapy for cancer is an emerging treatment at present, which brings hope to tumor patients because it has the characteristics of low toxicity and effectiveness, and can enable patients to obtain the hope of long-term survival. Immunotherapy can achieve clinical cure in some cancer patients, such as malignant melanoma. If immunotherapy is applied, some patients can get the purpose of long-term survival, which can make the tumor cells in the body disappear and kill completely, and even make the patients achieve clinical cure of five-year survival. However, not all cancer patients can reach the standard of clinical cure by applying immunotherapy, and some tumor patients have the possibility of recurrence or metastasis during the process of immunotherapy. Therefore, in the process of applying immunotherapy, it is necessary to review regularly and must communicate more with the consulting doctor or specialist doctors in specialized hospitals, who will determine the symptoms, imaging and biochemical results to assess whether the treatment can be continued or whether the treatment effect can be continued all the time.