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From the Departments of Medicine/Pulmonary Sciences and Critical Care Medicine,* Pharmaceutical Sciences, Medicine/Renal Medicine, Preventive Medicine and Biometrics, and Pathology,** and the Comprehensive Cancer Center,¶ University of Colorado Health Sciences Center, Denver, Colorado; the Department of Medicine, Division of Pulmonary Sciences and Critical Care Medicine, Denver Veteran’s Administration Medical Center, Denver, Colorado; and the Department of Pharmacology,|| School of Medicine, University of North Carolina, Chapel Hill, North Carolina
Human adenocarcinoma (AC) is the most frequently diagnosed human lung cancer, and its absolute incidence is increasing dramatically. Compared to human lung AC, the A/J mouse-urethane model exhibits similar histological appearance and molecular changes. We examined the gene expression profiles of human and murine lung tissues (normal or AC) and compared the two species’ datasets after aligning 
7500 orthologous genes. A list of 409 gene classifiers (P value <0.0001), common to both species (joint classifiers), showed significant, positive correlation in expression levels between the two species. A number of previously reported expression changes were recapitulated in both species, such as changes in glycolytic enzymes and cell-cycle proteins. Unexpectedly, joint classifiers in angiogenesis were uniformly down-regulated in tumor tissues. The eicosanoid pathway enzymes prostacyclin synthase (PGIS) and inducible prostaglandin E2 synthase (PGES) were joint classifiers that showed opposite effects in lung AC (PGIS down-regulated; PGES up-regulated). Finally, tissue microarrays identified the same protein expression pattern for PGIS and PGES in 108 different non-small cell lung cancer biopsies, and the detection of PGIS had statistically significant prognostic value in patient survival. Thus, the A/J mouse-urethane model reflects significant molecular details of human lung AC, and comparison of changes in orthologous gene expression may provide novel insights into lung carcinogenesis.
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