Different cancers have different prognosis, therefore, how long a cancer patient can live depends on the patient’s own condition and cannot be generalized. For example, for the most common lung cancer, the prognosis is different for different degree of differentiation, the lower the degree of differentiation, the higher the degree of malignancy, and the worse the prognosis is. It also depends on the patient’s emaciation. If the emaciation is mild, it may be caused by cancer combined with dyspepsia, for example, pancreatic cancer, and the survival rate is generally higher if the patient improves his diet or supplements in vitro in a timely manner and undergoes surgical treatment at an early stage. However, if the wasting is caused by the continuous growth of the tumor, which makes the patient’s body consume a lot of nutrients, at this time, the patient is usually in the middle or late stage of the tumor, and the prognosis is relatively poor, but the survival time of the patient can be extended by adopting chemotherapy, radiotherapy, immunotherapy and so on. Therefore, the specific survival time mainly depends on the specific situation of the patient and the severity of the disease, and it is recommended to cooperate with the doctor to actively carry out the treatment.