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To determine the expression of β-catenin, lymphoid enhancer-binding protein-1 (LEF-1), and heparanase-1 (HPA-1) and to evaluate these proteins' potential prognostic values in malignant acral melanoma without mutations in BRAF exons 11 and 15 and NRAS exons 1 and 2, specimens from 90 patients with wild-type BRAF and NRAS were assessed and analyzed by immunohistochemistry and western blotting. The positive expression of β-catenin, lymphoid enhancer-binding protein-1, and heparanase-1 was observed in 36 (72%), 31 (62%), and 32 (64%) of the detected acral melanomas, respectively. The expression of β-catenin, lymphoid enhancer-binding protein-1, and heparanase-1 was not correlated with gender, age, or diseased body parts (p&gt;0.05), but was significantly positively correlated with the tumor node metastasis (TNM) stage and metastasis (correlation=0.406 and 0.716, 0.397 and 0.582, 0.353 and 0.579; p=0.040 and 0.0001, 0.0040 and 0.0001, 0.0120 and 0.0001, respectively). We also observed that the increased expression of β-catenin, lymphoid enhancer-binding protein-1, and heparanase-1 was significantly correlated with decreased survival and poor prognosis (p=0.001, 0.010, and 0.023, respectively). A multifactorial analysis using Cox's regression model revealed that β-catenin, lymphoid enhancer-binding protein-1, heparanase-1, and the TNM stage were all independent factors in malignant melanoma (risk ratios were 7.294, 5.550, 5.622, and 4.794; p-values were 0.007, 0.018, 0.018, and 0.029, respectively). This study may provide the basis for the use of β-catenin, lymphoid enhancer-binding protein-1, and heparanase-1 as novel targets in the treatment of malignant invasion and metastasis in acral melanoma cancer. The expression of β-catenin, LEF-1, and HPA-1 was assessed and compared in malignant melanoma with that of peritumoral tissue and benign nevus in the patients with negative mutations in BRAF exons 11 and 15 and NRAS exons 1 and 2. The study may provide the basis for β-catenin, LEF-1, and HPA-1 as new targets in the treatment of malignant invasion and metastasis in melanoma cancer.

dna and cell biology

Increased Levels of β-catenin, LEF-1, and HPA-1 Correlate with Poor Prognosis for Acral Melanoma with Negative BRAF and NRAS Mutation in BRAF Exons 11 and 15 and NRAS Exons 1 and 2