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. 1997;75(2):208–212. doi: 10.1038/bjc.1997.35

Expression of the multidrug resistance-associated protein (MRP) gene in colorectal carcinomas.

M Fillpits 1, R W Suchomel 1, G Dekan 1, W Stiglbauer 1, K Haider 1, D Depisch 1, R Pirker 1
PMCID: PMC2063277  PMID: 9010028

Abstract

To determine the clinical significance of MRP in patients with colorectal carcinomas, we have studied the expression of the MRP gene by reverse transcription-polymerase chain reaction (RT-PCR) (n = 105) and by immunohistochemistry (n = 30). MRP mRNA expression was observed in 92 (88%) tumour specimens. Positive MRP staining with monoclonal antibodies QCRL-1 and QCRL-3 was detected in all samples studied with strong staining in seven (23%) and weak staining in 23 (77%) specimens. Strong MRP staining in these samples did not appear to be related to the age and sex of the patients, localization of the primary tumour, histological grade, tumour size, lymph node metastasis, distant metastasis and tumour stage. Strong MRP staining was not associated with MDR1 RNA or P-glycoprotein (P-gp) expression. Kaplan-Meier curves revealed that overall survival of patients with strong MRP-staining tumours was similar to the survival of patients with weak-staining tumours. These data indicate that the MRP gene is expressed in primary colorectal carcinomas but is neither related to known prognostic factors nor a prognostic factor by itself.

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Selected References

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