Gene Set: SPIRA_SMOKERS_LUNG_CANCER_DN

Standard name SPIRA_SMOKERS_LUNG_CANCER_DN
Systematic name M6515
Brief description Down-regulated genes that distinguished smokers with and without lung cancer.
Full description or abstract Lung cancer is the leading cause of death from cancer in the US and the world. The high mortality rate (80-85% within 5 years) results, in part, from a lack of effective tools to diagnose the disease at an early stage. Given that cigarette smoke creates a field of injury throughout the airway, we sought to determine if gene expression in histologically normal large-airway epithelial cells obtained at bronchoscopy from smokers with suspicion of lung cancer could be used as a lung cancer biomarker. Using a training set (n = 77) and gene-expression profiles from Affymetrix HG-U133A microarrays, we identified an 80-gene biomarker that distinguishes smokers with and without lung cancer. We tested the biomarker on an independent test set (n = 52), with an accuracy of 83% (80% sensitive, 84% specific), and on an additional validation set independently obtained from five medical centers (n = 35). Our biomarker had approximately 90% sensitivity for stage 1 cancer across all subjects. Combining cytopathology of lower airway cells obtained at bronchoscopy with the biomarker yielded 95% sensitivity and a 95% negative predictive value. These findings indicate that gene expression in cytologically normal large-airway epithelial cells can serve as a lung cancer biomarker, potentially owing to a cancer-specific airway-wide response to cigarette smoke.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 17334370   Authors: Spira A,Beane JE,Shah V,Steiling K,Liu G,Schembri F,Gilman S,Dumas YM,Calner P,Sebastiani P,Sridhar S,Beamis J,Lamb C,Anderson T,Gerry N,Keane J,Lenburg ME,Brody JS
Exact source Fig. 2
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(show 6 gene sets from the same authors)
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Organism Homo sapiens
Contributed by Jessica Robertson (MSigDB Team)
Source platform AFFY_HG_U133
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Version history 3.0: First introduced

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