The length of survival of patients with conservative cancer treatment is mainly determined by the type of cancer, the patient’s nutritional status and other factors. Conservative treatment means symptomatic treatment, supportive treatment, and no active anti-tumor treatment. Patients who require conservative treatment are usually in advanced stages of cancer, and the patients are in poor health and cannot or are not willing to undergo anti-tumor treatment, and the survival time of patients in such cases is usually calculated in months. For certain cancers with higher malignancy, such as malignant melanoma, Burkitt’s lymphoma, etc., the survival time is usually less than one month if only conservative treatment is given. For less malignant tumors, such as inert lymphoma and highly differentiated lung adenocarcinoma, patients with conservative treatment can live longer than six months. In addition, some patients are older and have poor nutritional status, so ordinary conservative treatment does not prolong the survival of patients, and most of them do not survive more than three months. In conclusion, although good conservative treatment can also extend the survival time of patients with advanced cancer, the effect is limited and most of them will die within a few months.