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Original Article
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Volume 334:231-238 January 25, 1996 Number 4
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Expression of the Gene for Multidrug-Resistance–Associated Protein and Outcome in Patients with Neuroblastoma
Murray D. Norris, Ph.D., Sharon B. Bordow, B.Sc., Glenn M. Marshall, M.B., B.S., Paul S. Haber, M.B., B.S., M.D., Susan L. Cohn, M.D., and Michelle Haber, Ph.D.

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ABSTRACT

Background Overexpression of the gene for the multidrug-resistance–associated protein (MRP) has been linked with resistance to chemotherapeutic agents (multidrug resistance) in vitro. The expression of MRP by neuroblastoma cells correlates with N-myc oncogene amplification, a well-established prognostic indicator in patients with neuroblastoma.

Methods To relate MRP gene expression to established prognostic markers and the clinical outcome of neuroblastoma, we analyzed MRP expression in specimens of primary tumors from 60 patients with neuroblastoma.

Results Levels of MRP gene expression were significantly higher in tumors with N-myc amplification than in tumors without such amplification (P<0.001). High levels of MRP expression were strongly associated with reductions in both survival and event-free survival (P<0.001) in the overall study population and in subgroups of patients without N-myc amplification and patients with localized disease. For the overall study population, the five-year cumulative survival rates in the groups with high and low levels of MRP expression were 57 percent (95 percent confidence interval, 37 to 78 percent) and 94 percent (95 percent confidence interval, 86 to 100 percent), respectively. In contrast, expression of the MDR1 multidrug-resistance gene was not predictive of survival or event-free survival. After adjustment by multivariate analysis for the effects of N-myc amplification and other prognostic indicators, high levels of MRP expression retained significant prognostic value for poor survival (relative hazard, 14.9; P = 0.01) and poor event-free survival (relative hazard, 9.7; P = 0.004), whereas N-myc amplification had no prognostic value.

Conclusions High levels of MRP gene expression in patients with neuroblastoma correlate strongly with poor outcome. The findings suggest that expression of this multidrug-resistance gene accounts for the association between N-myc amplification and reduced survival.


Source Information

From the Children's Leukaemia and Cancer Research Centre, University of New South Wales and Prince of Wales Children's Hospital, Sydney, Australia (M.D.N., S.B.B., G.M.M., M.H.); the Department of Gastroenterology, Prince of Wales Hospital, Sydney, Australia (P.S.H.); and the Department of Pediatrics, Northwestern University Medical School and Children's Memorial Hospital, Chicago (S.L.C.).

Address reprint requests to Dr. Michelle Haber at the Children's Leukaemia and Cancer Research Centre, Prince of Wales Children's Hospital, High St., Randwick, NSW 2031, Australia.

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