While radiotherapy and chemotherapy inhibit or kill tumor cells, they also have toxic effects on the body's normal cells, leading to a decline in immunity. For example, some chemotherapy drugs can cause drug-induced fever, allergic reactions, and even long-term toxicities such as immune suppression, teratogenicity, and carcinogenicity. A clinical statistical report from the U.S. Department of Health states: "Patients who undergo radiotherapy and chemotherapy have an eight times higher risk of cancer cell metastasis and spread compared to those who do not." Many experts believe that the occurrence of tumors is related to a decline in the body's immunity, and surgery or radiotherapy/chemotherapy should not be undertaken lightly. While many patients' conditions are controlled after radiotherapy and chemotherapy, their immunity remains low, making it easy for tumor cells to return, leading to metastasis and spread. Therefore, patients recovering from radiotherapy and chemotherapy must place great emphasis on improving their immunity to achieve the desired treatment outcomes.