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- W2045965076 abstract "Oxidative stress is a contributing factor in the carcinogenesis of colorectal cancer. The Nrf2 [nuclear factor (erythroid-derived 2)-like 2; NFE2L2] pathway is one of the major cellular defense mechanisms against oxidative stress. This study investigated the expression of the Nrf2 pathway in colorectal cancer. Formalin-fixed paraffin-embedded tissue arrays consisting of the tumor, adjacent normal, and distant normal tissues from the resected specimens of 83 colorectal cancer patients were subjected to immunohistochemical (IHC) staining with antibodies against Nrf2, kelch-like ECH-associated protein 1 (Keap1), p21, P62, Parkinson protein 7 (Park7), prohibitin, BTB and CNC homology 1 (Bach1), CD34 and 8-hydroxy-2′-deoxyguanosine (8-OHdG). The mean IHC density of each IHC staining was digitally analyzed. The results showed that molecules of the Nrf2 pathway were actively expressed, with different expression profiles among the tumor and normal tissues. The oxidative stress, represented by the mean IHC staining density of 8-OHdG, did not differ but was correlated with the expressions of different Nrf2 pathway molecules to a varied extent in tumor and normal tissues of colorectal cancer. Keap1 [estimate, 0.49; 95% confidence interval (CI), 0.19-0.79] and Bach1 (estimate, 0.24; 95% CI, 0.11-0.38) were significant predictors for the expression of 8-OHdG and had the closest proximity to Nrf2 in the cluster dendrogram of the tumor and distant normal tissues, respectively. Advanced stage (estimate, 14.9; 95% CI, 2.99-26.8) and current smoker (estimate, 15.6; 95% CI, 1.92-29.3) were significant predictors with high estimates for Bach1 in the adjacent and distant normal tissues, respectively. In colorectal cancer, the molecules of the Nrf2 pathway have different expression profiles and a difference in their importance, especially Keap1 and Bach1, related to Nrf2 and oxidative stress among tumor and normal tissues." @default.
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- W2045965076 date "2013-12-01" @default.
- W2045965076 modified "2023-10-16" @default.
- W2045965076 title "Immunohistochemical Study of the Nrf2 Pathway in Colorectal Cancer" @default.
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- W2045965076 doi "https://doi.org/10.1097/pai.0b013e318282ac20" @default.
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