Unfortunately, there has been no way to know ahead of time which patients will respond to treatment. This means that the vast majority endure months of chemotherapy treatment - and its side effects - without extending their survival. However, only 5% to 15% of patients with lung cancer benefit from chemotherapy after surgery. Because of this, people with lung cancer usually receive chemotherapy after surgery to try to kill any undetected tumor cells. Surgery is effective at removing early-stage tumors, but more than half of patients with stage 2 or 3 disease have a recurrence of their cancer elsewhere in the body. Lung adenocarcinoma, the most common form of lung cancer in the United States, can be difficult to cure unless diagnosed at an early stage.
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