Lung cancer is the second most frequent cancer worldwide, and it accounts for 18% of all cancer-related deaths. Most cases of lung cancer involve non-small-cell lung cancer (NSCLC), in which therapy with immune checkpoint inhibitors (ICIs) can improve prognosis, yet up to 75% of patients fail to respond to it. Researchers at the Chinese Academy of Medical Sciences & Peking Union Medical College have identified potential metabolic markers that may help predict which patients are more likely to respond to ICI therapy.