Exhaled breath biomarker may detect lung cancer. Researchers from the Cleveland Clinic have discovered that it may be possible to detect lung cancer by assaying the chemical composition of exhaled breath. The researchers used a chemical detection technique to compare the chemical composition of 82 confirmed lung cancer patients breath with 155 patients who are at risk for lung cancer but free of the disease. They found that their chemical detection technique of exhaled breath accurately identified those patients with lung cancer. This could be a huge breakthrough in the diagnosis of lung cancer. So if this lung cancer detecting machine can identify lung cancer before an x-ray can, then many lives could be saved.