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p53 gene mutation in B-cell chronic lymphocytic leukemia is associated with
drug resistance and is independent of MDR1/MDR3 gene expression
S el Rouby, A Thomas, D Costin, CR Rosenberg, M Potmesil, R Silber and EW Newcomb
Department of Pathology, New York University School of Medicine.
We studied 53 patients with B-cell chronic lymphocytic leukemia (B-CLL) and
found mutations of the p53 gene in 15%. Patients with p53 gene mutations
were found to have an aggressive form of B-CLL disease characterized by
advanced Rai stage, rapid lymphocyte doubling time (LDT), and resistance to
chemotherapy. While 27 of 29 treated patients (93%) without p53 mutations
achieved a partial remission, only one of seven treated patients (14%) with
p53 mutations achieved a partial remission (P = .00009). Adjusting for
prognostic factors (age, sex, race, and Rai stage), patients with p53 gene
mutations had a 13-fold greater risk of death than patients without p53
mutations (P = .013). In addition to examining the clinical relevance of
p53 gene mutations in B-CLL, we investigated the possible role of p53 gene
regulation in the expression of the multidrug resistance genes MDR1 and
MDR3. We quantitated MDR1 and MDR3 mRNA expression by reverse
transcription- polymerase chain reaction (RT-PCR). Expression of both the
MDR1 and MDR3 genes was independent of p53 gene mutation or prior drug
treatment, and did not predict for clinical response. Our findings indicate
that p53 gene mutations in B-CLL are associated with a poor clinical
outcome and may be a prognostic indicator for drug resistance.
Volume 82,
Issue 11,
pp. 3452-3459,
12/01/1993
Copyright © 1993 by The American Society of Hematology

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