ABCB1 (MDR1) polymorphisms and ovarian cancer progression and survival: A comprehensive analysis from the Ovarian Cancer Association Consortium and The Cancer Genome Atlas

Johnatty, S. E. et al. (2013) ABCB1 (MDR1) polymorphisms and ovarian cancer progression and survival: A comprehensive analysis from the Ovarian Cancer Association Consortium and The Cancer Genome Atlas. Gynecologic Oncology, 131(1), pp. 8-14. (doi:10.1016/j.ygyno.2013.07.107)

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<b>Objective</b> <i>ABCB1</i> encodes the multi-drug efflux pump P-glycoprotein (P-gp) and has been implicated in multi-drug resistance. We comprehensively evaluated this gene and flanking regions for an association with clinical outcome in epithelial ovarian cancer (EOC).<p></p> <b>Methods</b> The best candidates from fine-mapping analysis of 21 <i>ABCB1</i> SNPs tagging C1236T (rs1128503), G2677T/A (rs2032582), and C3435T (rs1045642) were analysed in 4616 European invasive EOC patients from thirteen Ovarian Cancer Association Consortium (OCAC) studies and The Cancer Genome Atlas (TCGA). Additionally we analysed 1,562 imputed SNPs around ABCB1 in patients receiving cytoreductive surgery and either ‘standard’ first-line paclitaxel–carboplatin chemotherapy (n = 1158) or any first-line chemotherapy regimen (n = 2867). We also evaluated ABCB1 expression in primary tumours from 143 EOC patients.<p></p> <b>Result</b> Fine-mapping revealed that rs1128503, rs2032582, and rs1045642 were the best candidates in optimally debulked patients. However, we observed no significant association between any SNP and either progression-free survival or overall survival in analysis of data from 14 studies. There was a marginal association between rs1128503 and overall survival in patients with nil residual disease (HR 0.88, 95% CI 0.77–1.01; p = 0.07). In contrast, <i>ABCB1</i> expression in the primary tumour may confer worse prognosis in patients with sub-optimally debulked tumours.<p></p> <b>Conclusion</b> Our study represents the largest analysis of <i>ABCB1</i> SNPs and EOC progression and survival to date, but has not identified additional signals, or validated reported associations with progression-free survival for rs1128503, rs2032582, and rs1045642. However, we cannot rule out the possibility of a subtle effect of rs1128503, or other SNPs linked to it, on overall survival.<p></p>

Item Type:Articles
Glasgow Author(s) Enlighten ID:Paul, Mr James
Authors: Johnatty, S. E., Beesley, J., Gao, B., Chen, X., Lu, Y., Law, M. H., Henderson, M. J., Russell, A. J., Hedditch, E. L., Emmanuel, C., Fereday, S., Webb, P. M., Goode, E. L., Vierkant, R. A., Fridley, B. L., Cunningham, J. M., Fasching, P. A., Beckmann, M. W., Ekici, A. B., Hogdall, E., Kjaer, S. K., Jensen, A., Hogdall, C., Brown, R., Paul, J., Lambrechts, S., Despierre, E., Vergote, I., Lester, J., Karlan, B. Y., Heitz, F., du Bois, A., Harter, P., Schwaab, I., Bean, Y., Pejovic, T., Levine, D. A., Goodman, M. T., Camey, M. E., Thompson, P. J., Lurie, G., Shildkraut, J., Berchuck, A., Terry, K. L., Cramer, D. W., Norris, M. D., Haber, M., MacGregor, S., deFazio, A., and Chenevix-Trench, G.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cancer Sciences
Journal Name:Gynecologic Oncology
ISSN (Online):1095-6859
Copyright Holders:Copyright © 2013 The Authors
First Published:First published in Gynecologic Oncology 131(1):8-14
Publisher Policy:Reproduced under a Creative Commons License

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