How long a person can live with cancer is related to factors such as the site of the cancer, the type of pathology, the stage of the pathology, the treatment received and the nutritional status of the cancer patient himself, which may be months, years or even decades. Cancer is a collective term for a large group of malignant tumors. Most in situ or early stage cancers can be cured without affecting the survival of patients. Most patients do not experience recurrence for more than 5-10 years after treatment, and late survival may exceed 20 years or even longer. The exact length of time a cancer patient can live varies depending on the specific circumstances of the cancer and the patient’s own physical condition, for example, some patients may suffer from other major medical diseases that affect survival. For mid to late stage cancer, if effective treatment such as radiotherapy and targeted therapy is given, the survival time may be more than 3-5 years. In case of advanced and widely spread cancer, the survival time is mostly shorter, which may be around half a year or even 1-2 months. Once cancer is detected, it should be treated actively. The earlier it is detected and treated, the better the prognosis and the longer the survival time will be.