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- W2006647143 abstract "BACKGROUND Multidrug resistance protein (MRP) is a membrane phosphoglycoprotein with an Mr of 190,000 that is involved in the non-P-glycoprotein mediated multidrug resistance of human tumor cells. The aim of this study was to determine the clinicopathologic relevance of MRP expression in human gastrointestinal tract carcinomas. METHODS The authors prepared a rabbit antiserum against MRP that does not cross-react with P-glycoprotein and retrospectively examined the expression of MRP in 86 squamous cell carcinomas of the esophagus, 103 adenocarcinomas of the stomach, and 139 colorectal adenocarcinomas by immunohistochemistry. None of the patients in this study had received prior chemotherapy. RESULTS The proportion of MRP positive samples in the squamous cell carcinomas of the esophagus (62.8%, 54 of 86) was significantly higher than that in the adenocarcinomas of the stomach (34.1%, 35 of 103) and the colorectal adenocarcinomas (40.3%, 56 of 139) (P <0.01). The proportion of MRP positivity in the well-differentiated carcinomas was significantly higher than that in moderately or poorly differentiated carcinomas. MRP expression was independent of gender, lymph node metastasis, and tumor progression. CONCLUSIONS These data indicate that the expression of MRP is correlated with the differentiation of carcinoma cells in the gastrointestinal tract and may be involved in the intrinsic drug resistance of well-differentiated squamous cell carcinoma of the esophagus. Cancer 1998;82:661-6. © 1998 American Cancer Society." @default.
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- W2006647143 date "1998-02-15" @default.
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- W2006647143 title "The expression of multidrug resistance protein in human gastrointestinal tract carcinomas" @default.
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- W2006647143 doi "https://doi.org/10.1002/(sici)1097-0142(19980215)82:4<661::aid-cncr7>3.0.co;2-o" @default.
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