Researchers Say That a Blood Test Could Help Detect Lung Cancer

Scientists have identified a protein-based blood signature that may predict the development of lung cancer up to five years before the disease is diagnosed. The findings add to growing evidence that chronic inflammation plays an important role in cancer development. The discovery could eventually shift the focus from trying to treat advanced disease to preventing lung cancer altogether.

“Lung cancer is often diagnosed only after it has already spread,” the researchers noted in the study. Earlier detection could give doctors more time to monitor patients and intervene before tumors become clinically detectable. The study found that a 14–protein blood signature, combined with factors such as age, smoking history and previous lung disease, could accurately predict an individual’s future risk of lung cancer. Because the disease is frequently detected at later stages, identifying high–risk patients earlier could improve screening and expand opportunities for preventive treatment.

Another major finding involved chronic inflammation. Inflammation is the body’s natural response to injury or infection. When it becomes persistent, however, it can damage healthy tissue over time. The proteins in the blood signature were closely linked to inflammatory processes in the lungs, suggesting inflammation may help trigger the earliest stages of lung cancer. “These findings suggest inflammation may begin shaping cancer development years before a diagnosis is made,” the researchers noted.

Importantly, the results were not limited to smokers. While smoking remains the leading cause of lung cancer, scientists found that the protein signature also identified elevated risk among people who had never smoked. That finding could help doctors identify patients who are currently excluded from many traditional screening programs because they don’t smoke. To reach their conclusions, scientists analyzed data from eight international datasets, including one composed entirely of non-smokers. The protein signature consistently predicted future lung cancer across the different populations.

The scientists also discovered that the proteins increased when a specific inflammatory pathway became activated. Environmental exposures such as cigarette smoke and air pollution appeared to trigger this pathway, providing new insight into how outside factors contribute to cancer risk.

Although additional studies are needed before the blood test becomes part of routine medical care, scientists say the findings could prepare them for new ways to prevent lung cancer. Future treatments and even vaccines could be designed to interrupt cancer promoting inflammation and stop lung cancer before it begins.