Some patients ask how many years the efficacy of immunotherapy can last once it takes effect. To understand this question, we must first grasp the underlying logic of immunotherapy. Simply put, immunotherapy involves activating our own immune system through external means to fight against tumors. Therefore, the duration of its effectiveness depends not only on the drug's action but also significantly on our own immune strength. Some patients may experience benefits for a few months, while others may maintain them for several years—there is no definitive answer. Currently, official guidelines cannot provide specific predictions regarding the prognosis of immunotherapy. However, one thing is certain: whether undergoing immunotherapy or other treatments, improving one's own immunity remains a crucial aspect.