T-cell immunotherapy is the process of extracting T-cells from a cancer patient’s body and genetically engineering them to make car-T cells, which are used to treat cancer. car-T cell therapy is a new type of treatment program for cancer. T lymphocytes extracted from the patient’s body and then modified into car-T cells are able to denature cancer proteins, inhibit the destructive function of cancer cells, and ultimately treat cancer. Early stage patients may present adverse reactions after treatment, patients should carefully assess their condition and contact their doctor immediately for symptomatic treatment if there are side effects. Cancer patients should maintain a good mood in daily life, actively cooperate with the treatment, take vitamins and high protein food every day to enhance the body’s resistance, pay attention to rest, and go to the hospital in time for treatment if there is any situation.