Atelectasis was reported as a favorable prognostic sign of pulmonary carcinoma; however, the underlying mechanism in those
patients is not known. In this study, we aimed to investigate prospectively the potential impact of atelectasis and/or obstructive
pneumonitis (AO) on survival and the relation between atelectasis and some laboratory blood parameters. The study was
conducted on 87 advanced stage non-small cell lung cancer (NSCLC) patients. Clinical and laboratory parameters of patients
at first presentation were recorded, and patients were divided into two groups according to the presence of AO in
thorax computed tomography (CT). Survival was calculated using Kaplan-Meier and univariate Cox’s regression analyses.