RT Journal Article SR Electronic T1 Is there a difference in the incidence of metastasis at diagnosis of lung cancer between smokers and non smokers? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP P4508 VO 42 IS Suppl 57 A1 Anoma Siribaddana A1 Srimati Waidyasekara A1 Kapila Senevirathna A1 Kanchana Dissanayake A1 Manil Pieris YR 2013 UL http://erj.ersjournals.com/content/42/Suppl_57/P4508.abstract AB BackgroundSince the degree of suspicion of lung cancer in nonsmokers is less would it lead to a delay in diagnosis? Or would etiologies other than smoking cause more aggressive, disseminated cancers? T he objective was to find out differences of incidence in metastasis at presentation in smokers and nonsmokersMethodologyThis prospective study was carried out in Teaching hospital kandy Sri Lanka for one year from January to December 2013.All patients who had histologicaly proven lung cancer were recruited. Their smoking history was obtained using an interviewer administered questionnaire. Staging was done by CT thorax, neck and upper abdomen, and in some cases with imaging of spine and brain. Patients with pleural effusions had pleural aspiration for cytology and pleural biopsy. Staging was done using TNM 7th revision .Smokers and nonsmokers were compared using chi square test.ResultsTotal 71Gender N %males 61 85.92females 10 14.10Mean age 62.8, Standard deviation +/- 11.26View this table:Age distributionView this table:Incidence of metastasis at diagnosis by groupConclusionNonsmokers have a statistically significant higher chance of having metastasis at the time of diagnosis than smokers.