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Smoking-related Genomic Signatures in Non–Small Cell Lung Cancer

¹ Division of Allergy Pulmonary and Critical Care Medicine, Department of Medicine, Vanderbilt-Ingram Comprehensive Cancer Center and Nashville VAMC, Nashville, Tennessee; and ² Departments of Epidemiology and ³ Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas

Correspondence and request for reprints should be addressed to Pierre P. Massion, M.D., Division of Allergy, Pulmonary and Critical Care Medicine, Thoracic Oncology Center, Vanderbilt-Ingram Comprehensive Cancer Center, 2220 Pierce Avenue, 640 Preston Research Building, Nashville, TN 37232-6838. E-mail: pierre.massion{at}vanderbilt.edu

Rationale: Tobacco smoking is responsible for 85% of all lung cancers. To further our understanding of the molecular pathogenesis of lung cancer, we determined whether smoking history leads to the emergence of specific genomic alterations found in non–small cell lung cancer (NSCLC).

Objectives: To identify gene copy number alterations in NSCLCs associated with smoking history or DNA repair capacity.

Methods: Seventy-five NSCLCs were selected for this study from patients with current, none, or past smoking history, including pack year information. Tissue sections were microdissected, and DNA was extracted, purified, and labeled by random priming before hybridization onto bacterial artificial chromosome (BAC) arrays. Normalized ratios were correlated with smoking history and DNA repair capacity was measured by an in vitro lymphocyte assay in the same patients.

Measurements and Main Results: We identified smoking-related genomic signatures in NSCLCs that could be predicted with an overall 74% accuracy. Lung tumors arising from current-smokers had the greatest number of copy number alterations. The genomic regions most significantly associated with smoking were located within 60 regions and were functionally associated with genes controlling the M phase of the cell cycle, the segregation of chromosomes, and the methylation of DNA. Verification of the data is provided from data in the public domain and by quantitative real-time polymerase chain reaction. The associations between genomic abnormalities and DNA repair capacity did not reach statistical significance.

Conclusions: These findings indicate that smoking history leaves a specific genomic signature in the DNA of lung tumors and suggest that these alterations may reflect new molecular pathways to cancer development.

Key Words: array comparative genomic hybridization • tobacco • profile • microarray

AT A GLANCE COMMENTARY Scientific Knowledge on the Subject Lung tumors that develop in smokers and nonsmokers have similar clinical behavior and yet result from different injury to the airways. It remains to be determined whether tobacco smoking is responsible for the development of a specific genomic signature that is related to tumorigenesis. What This Study Adds to the Field Lung cancers from smokers carry a genomic signature that is distinct from that of never-smokers. The genes associated with these genomic regions of aberration are involved in tobacco-related molecular pathways of tumorigenesis and may represent new targets for chemoprevention.

 

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