HIF1A Overexpression Is Associated with Poor Prognosis in a Cohort of 731 Colorectal Cancers
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CitationBaba, Yoshifumi, Katsuhiko Nosho, Kaori Shima, Natsumi Irahara, Andrew T. Chan, Jeffrey A. Meyerhardt, Daniel C. Chung, Edward L. Giovannucci, Charles S. Fuchs, and Shuji Ogino. 2010. “HIF1A Overexpression Is Associated with Poor Prognosis in a Cohort of 731 Colorectal Cancers.” The American Journal of Pathology 176 (5): 2292–2301. https://doi.org/10.2353/ajpath.2010.090972.
AbstractTissue hypoxia commonly occurs in tumors. Hypoxia-inducible factor (HIF)-1 and HIF-2, which are essential mediators of cellular response to hypoxia, regulate gene expression for tumor angiogenesis, glucose metabolism, and resistance to oxidative stress. Their key regulatory subunits, HIF1A (HIF-1 alpha) and endothelial PAS domain protein 1 (EPAS1; HIF-2 alpha), are over-expressed and associated with patient prognosis in a variety of cancers. However, prognostic or molecular features of colon cancer with HIF expression remain uncertain. Among 731 colorectal cancers in two prospective cohort studies, 142 (19%) tumors showed HIF1A overexpression, and 322 (46%) showed EPAS1 overexpression by immunohistochemistry. HIF1A overexpression was significantly associated with higher colorectal cancer-specific mortality in Kaplan-Meier analysis (log-rank test, P < 0.0001), univariate Cox regression (hazard ratio = 1.84; 95% confidence interval, 1.37 to 2.47; P < 0.0001) and multivariate analysis (adjusted hazard ratio = 1.72; 95% confidence interval, 1.26 to 2.36; P = 0.0007) that adjusted for clinical and tumoral features, including microsatellite instability, TP53 (p53), PTGS2 (cyclooxygenase-2), CpG island methylator phenotype, and KRAS, BRAF, PIK3C4, and LINE-1 methylation. In contrast, EPAS1 expression was not significantly associated with patient survival. In addition, HIF1A expression was independently associated with PTGS2 expression (P = 0.0035), CpG island methylator phenotype-high (P = 0.013), and LINE-1 hypomethylation (P = 0.017). EPAS1 expression was inversely associated with high tumor grade (P = 0.0017) and obesity (body mass index >= 30 kg/m(2))(P = 0.039). In conclusion, HIF1A expression is independently associated with poor prognosis in colorectal cancer, suggesting HIF1A as a biomarker with potentially important therapeutic implications. (Am J Pathol 2010, 176:2292-2301; DOI: 10.2353/ajpath.2010.090972)
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