Clinical significance of subcellular localization of KL-6 mucin in primary colorectal adenocarcinoma

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AIM: To assess subcellular localization of KL-6 mucin and its clinicopathological significance in colorectal carcinoma as well as metastatic lymph node and liver tissues.METHODS: Colorectal carcinoma tissues as well as metastatic lymph node and liver tissues were collected from 82 patients who underwent colorectomy or hepatectomy. Tissues were subjected to immunohistochemical analysis using KL-6 antibody.RESULTS: Of the 82 colorectal carcinoma patients, 6showed no staining, 29 showed positive staining only in the apical membrane, and 47 showed positive staining in the circumferential membrane and/or cytoplasm.Positive staining was not observed in non-cancerous colorectal epithelial cells surrounding the tumor tissues.The five-year survival rate was significantly lower in cases showing positive staining in the circumferential membrane and/or cytoplasm (63.0%) than those showing positive staining only in the apical membrane (85.7%) and those showing no staining (100%).Statistical analysis between clinicopathological factors and subcellular localization of KL-6 mucin showed that KL-6 localization in the circumferential membrane and/or cytoplasm was significantly associated with the presence of venous invasion (P=0.0003), lymphatic invasion (P<0.0001), lymph node metastasis (P<0.0001),liver metastasis (P=0.058), and advanced histological stage (P<0.0001). Positive staining was observed in all metastatic lesions tested as well as in the primary colorectal carcinoma tissues.CONCLUSION: The subcellular staining patt of KL-6 in colorectal adenocarcinoma may be an important indicator for unfavorable behaviors such as lymph node and liver metastasis, as well as for the prognosis of patients.
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