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Association of multi-drug resistance gene polymorphisms with pancreatic cancer outcome
Article first published online: 4 OCT 2010
Copyright © 2010 American Cancer Society
Volume 117, Issue 4, pages 744–751, 15 February 2011
How to Cite
Tanaka, M., Okazaki, T., Suzuki, H., Abbruzzese, J. L. and Li, D. (2011), Association of multi-drug resistance gene polymorphisms with pancreatic cancer outcome. Cancer, 117: 744–751. doi: 10.1002/cncr.25510
- Issue published online: 3 FEB 2011
- Article first published online: 4 OCT 2010
- Manuscript Accepted: 10 JUN 2010
- Manuscript Revised: 21 MAY 2010
- Manuscript Received: 10 MAR 2010
- drug resistance gene;
- single nucleotide polymorphism;
- pancreatic cancer;
The purpose of this study was to identify single nucleotide polymorphisms (SNPs) of multidrug resistance genes that are associated with clinical outcome in patients with potentially resectable pancreatic adenocarcinoma who were treated with preoperative gemcitabine-based chemoradiotherapy at M. D. Anderson Cancer Center.
We selected 8 SNPs of 7 drug resistance genes, including MDR1 (ABCB1), MRP1-5 (ABCC1-5), and BCRP (ABCG2), reported to be important in mediating drug resistance. Genotype was determined by the Taqman method. The associations of genotype with tumor response to therapy and overall survival (OS) were evaluated using log-rank test, Cox regression, and logistic regression models.
MRP5 A-2G AA genotype showed significant association with OS (log-rank P = .010). The hazard ratio (95% confidence interval) was 1.65 (1.11-2.45) after adjusting for clinical predictors. The MRP2 G40A GG genotype had a weak association with reduced OS (log-rank P = .097). A combined effect of the two genotypes on OS was observed. Patients with none of the adverse genotypes had a median survival time (MST) of 34.0 months, and those with 1-2 deleterious alleles had a significantly lower MST of 20.7 months (log-rank P = .006). MRP2 G40A GG genotype was also significantly associated with poor histological response to chemoradiotherapy (P = .028).
These observations suggest a potential role of polymorphic variants of drug resistance genes in predicting therapeutic efficacy and survival of patients with potentially resectable pancreatic cancer. Cancer 2011. © 2010 American Cancer Society.