... purposes)Respiratory ResearchOpen AccessResearch Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up studyDiana Poli1,2, ... identifying and quantifying volatile organic compounds (VOCs) in exhaled air of patients with non-small cells lung cancer (NSCLC), by comparing the levels with those obtained from healthysmokers and ... in exhaled air, and apply it to a cross- sectional study of NSCLC and COPD patients, and healthy control smokers and non-smokers, and a short-term follow-up study of patients undergoingsurgery...