Significant advancements have been made in lung cancer treatment, particularly in recent years. Foremost among these developments is immunotherapy, also commonly known as "lung cancer vaccine," which offers great promise for patients with stage four lung cancer. Immunotherapy is a treatment method that enables the patient's own immune system to be activated to fight cancer cells. Thanks to this mechanism, it generally has fewer side effects compared to chemotherapy drugs.

In the past, immunotherapy was a last resort for stage four lung cancer patients when other chemotherapy options had failed. However, nowadays, in line with guidelines in America and Europe, immunotherapy can be directly administered as part of the initial treatment for patients diagnosed with stage four lung cancer.

Before starting immunotherapy, the patient needs to undergo specific examinations. The patient's suitability for immunotherapy is determined based on the type of lung cancer. For suitable candidates, treatment can be initiated immediately upon diagnosis. Although immunotherapy does not typically have side effects like nausea and vomiting, temporary inflammation in the intestines and thyroid gland may occur.

Currently, immunotherapy is used as a treatment aimed at extending the lifespan of stage four lung cancer patients. The primary goal of stage four cancer treatment is to improve the patient's quality of life and extend their lifespan as much as possible.