title: Canine scent detection in the diagnosis of lung cancer: revisiting a puzzling phenomenon.
abstract: Patient prognosis in lung cancer largely depends on early diagnosis. The exhaled breath of patients may represent the ideal specimen for future lung cancer screening. However, the clinical applicability of current diagnostic sensor technologies based on signal pattern analysis remains incalculable due to their inability to identify a clear target. To test the robustness of the presence of a so far unknown volatile organic compound in the breath of patients with lung cancer, sniffer dogs were applied. Exhalation samples of 220 volunteers (healthy individuals, confirmed lung cancer or chronic obstructive pulmonary disease (COPD)) were presented to sniffer dogs following a rigid scientific protocol. Patient history, drug administration and clinicopathological data were analysed to identify potential bias or confounders. Lung cancer was identified with an overall sensitivity of 71% and a specificity of 93%. Lung cancer detection was independent from COPD and the presence of tobacco smoke and food odours. Logistic regression identified two drugs as potential confounders. It must be assumed that a robust and specific volatile organic compound (or pattern) is present in the breath of patients with lung cancer. Additional research efforts are required to overcome the current technical limitations of electronic sensor technologies to engineer a clinically applicable screening tool.
authors.affiliation: Ambulante Pneumologie, Stuttgart, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Ehmann
authors.forename: E
authors.initials: E
authors.lastname: Boedeker
authors.forename: U
authors.initials: U
authors.lastname: Friedrich
authors.forename: J
authors.initials: J
authors.lastname: Sagert
authors.forename: J
authors.initials: J
authors.lastname: Dippon
authors.forename: G
authors.initials: G
authors.lastname: Friedel
authors.forename: T
authors.initials: T
authors.lastname: Walles
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis*; D000077192:Adenocarcinoma of Lung; D000328:Adult; D000368:Aged; D000818:Animals; D001944:Breath Tests / Q000379:methods; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D004285:Dogs; D055088:Early Detection of Cancer; D005260:Female; D005502:Food; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009812:Odorants; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis; D012680:Sensitivity and Specificity; D055752:Small Cell Lung Carcinoma / Q000175:diagnosis*; D014028:Tobacco Smoke Pollution
chemical_list: D014028:Tobacco Smoke Pollution