Abstract
In our previous study, Human Signal Transduction in Cancer Gene Array was used in 12 fresh tumor samples to detect the gene expression profiles in the esophageal squamous cell carcinoma (ESCC) tissues matched adjacent non-cancerous samples. Among genes up-regulated at least twofold, β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 were found. So subsequently, the aim of this study was to investigate the prognosis and clinicopathologic roles of β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 in ESCC tissue. The mRNA and protein expression levels of β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 genes in 70 ESCC and adjacent non-cancerous paraffin-embedded samples were determined by Real-Time Quantitative PCR (RT-PCR) and immunohistochemical staining. The mRNA expression level of β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 in ESCC was significantly higher than that in the adjacent non-cancerous tissues (0.0821 ± 0.0416 vs. 0.0185 ± 0.0201, P = 0.0000; 1.9934 ± 1.9888 vs. 0.8863 ± 0.665, P = 0.0184; 0.0298 ± 0.0215 vs. 0.0189 ± 0.0187, P = 0.0017; 2.098 ± 0.091 vs. 1.016 ± 0.078, P = 0.0000; 2.181 ± 2.158 vs. 0.931 ± 0.894, P = 0.0152; respectively), and the protein expression level of determined genes was also significantly higher than that in the adjacent non-cancerous tissues (0.2835 ± 0.0844 vs. 0.2352 ± 0.0670, P = 0.0003; 0.3830 ± 0.0947 vs. 0.2721 ± 0.1474, P = 0.0000; 0.2637 ± 0.0348 vs. 0.2042 ± 0.0180, P = 0.0000; 0.2058 ± 0.0316 vs. 0.1218 ± 0.0518, P = 0.0000; 0.2736 ± 0.0834 vs. 0.2251 ± 0.0571, P = 0.0001; respectively). Then, the overexpression of mRNA and protein levels of β-catenin, Wnt1 and Bmi-1 was aggressively associated with lymph node metastasis, advanced pathological stage, and prognosis of the patients with ESCC (P < 0.05). The up-expression of Hoxa9 mRNA and protein was also aggressively associated with lymph node metastasis and advanced pathological stage (P < 0.05); however, the overexpression of Hoxa9 protein was not associated with the prognosis (P > 0.05). Meanwhile, the hypo-expression of Smad4 mRNA was aggressively associated with advanced pathological stage and prognosis of the patients with ESCC (P < 0.05); however, the hypo-expression of Smad4 protein was neutral to the prognosis and lymph node metastasis (P > 0.05). β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 protein expression analysis showed that the positive outcomes of the combined detection of Wnt1 and β-catenin expression or Wnt1, β-catenin and Bmi-1 expression were significantly worse than those of a single target protein expression (P < 0.05). Meantime, the prognosis of the combined positive expression of Wnt1, β-catenin, and Bmi-1 was poorer than that in the combined positive expression of Wnt1 and β-catenin (P < 0.05). The prognosis of ESCC patients with the overexpression of Wnt1/β-catenin and Bmi-1 was relatively poor, and the level of Wnt1/β-catenin and Bmi-1 was conversely correlated with advanced pathological stage and lymph node metastasis. The expression level of Smad4 and Hoxa9 mRNA was also associated with the prognosis of the patients with ESCC, pathological stage, and lymph node metastasis; however, they might not be the independent prognostic factor.
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Supported by Affiliated Nanjing First Hospital, Nanjing Medical University and Nanjing Health Bureau, No. ZKX0114.
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Lv, J., Cao, XF., Ji, L. et al. Association of β-catenin, Wnt1, Smad4, Hoxa9, and Bmi-1 with the prognosis of esophageal squamous cell carcinoma. Med Oncol 29, 151–160 (2012). https://doi.org/10.1007/s12032-010-9816-5
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DOI: https://doi.org/10.1007/s12032-010-9816-5