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- W1965128617 abstract "Multidrug resistance is an important mechanism responsible for refractoriness of leukemia and worse outcome of patients. Overexpression of the multidrug resistance gene, MDR1, is of prognostic relevance in acute myeloid leukemia, while its role in acute lymphoblastic leukemia (ALL) is still under debate. Single nucleotide polymorphisms (SNP) have been detected in the MDR1 gene. The C3435T polymorphism in this gene seems to have functional and clinical consequences. In the present investigation, we have analyzed the role of the C3435T SNP for drug resistance and prognosis of human ALL. The C3435T SNP was analyzed in 20 T-ALL cell lines and in blood samples from 53 ALL patients and 7 healthy donors. The cell line panel consisted of cell lines not prior exposed in vitro to cytostatic drugs as well as of drug-resistant lines which were selected in vitro by exposure to doxorubicin, vincristine, methotrexate, or hydroxyurea. We have developed a highly sensitive matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS)-based genotyping approach to survey the C3435T SNP. Furthermore, mRNA expression was determined by real time reverse-transcribed polymerase chain reaction and doxorubicin sensitivity by a growth inhibition assay. Surprisingly, we did not find a significant correlation between C3435T homo- or heterozygote genotypes and MDR1 mRNA expression of cell lines or blood samples from patients and healthy donors. Furthermore, there was no relationship between the response of the cell lines to doxorubicin and the C3435T genotypes. Homo- or heterozygosity did not correlate to survival of patients in the Kaplan-Meier analysis. In conclusion, we do not have reason to assume that the C3435T SNP contributes to drug resistance of ALL and prognosis of ALL patients." @default.
- W1965128617 created "2016-06-24" @default.
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- W1965128617 date "2003-08-01" @default.
- W1965128617 modified "2023-10-17" @default.
- W1965128617 title "Analysis of single nucleotide polymorphism C3435T of the multidrug resistance gene MDR1 in acute lymphoblastic leukemia" @default.
- W1965128617 doi "https://doi.org/10.3892/ijo.23.2.509" @default.
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