How many years can a 70-year-old person survive once chemotherapy is administered is related to the stage of the disease, the treatment effect, the nursing care and the physical quality of the patient, which may be half a year or many years. Once a 70-year-old person has chemotherapy, if it is the early stage of cancer, the treatment effect is better, the usual care is better, and the patient’s state of mind is better, the survival time will be prolonged, and the patient may have to survive for five years or longer; on the contrary, the patient’s survival time will be reduced, and the patient may survive for three years, or less than three years. Do not eat spicy and stimulating food during chemotherapy, patients should not be nervous and avoid anger. Cancer patients to reduce the adverse effects of the disease, 70-year-old people once the chemotherapy is possible to survive for a long time, it is recommended that patients establish confidence in treatment.