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A genome wide association study (GWAS) providing evidence of an association between common genetic variants and late radiotherapy toxicity

Barnett, G. C.; Thompson, D.; Fachal Vilar, Laura; Kerns, S.; Talbot, C.; Elliott, R. M.; Dorling, L.; Coles, C. E.; Dearnaley, D. P.; Rosenstein, B. S.; Vega Gliemmo, Ana; Symonds, P.; Yarnold, J.; Baynes, C.; Michailidou, K.; Dennis, J.; Tyrer, J. P.; Wilkinson, J. S.; Gómez Caamaño, Antonio; Tanteles, G. A.; Platte, R.; Mayes, R.; Conroy, D.; Maranian, M.; Luccarini, C.; Gulliford, S. L.; Sydes, M. R.; Hall, E.; Haviland, J.; Misra, V.; Titley, J.; Bentzen, S. M.; Pharoah, P. D.; Burnet, N. G.; Dunning, A. M.; West, C. M.
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URI: http://hdl.handle.net/20.500.11940/4504
PMID: 24785509
DOI: 10.1016/j.radonc.2014.02.012
ISSN: 0167-8140
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Texto completo disponible por cortesía de Radiother Oncol . 2014 May;111(2):178-85. doi: 10.1016/j.radonc.2014.02.012. (879.9Kb)
Fecha de publicación
2014
Título de revista
RADIOTHERAPY AND ONCOLOGY
Tipo de contenido
Artigo
MeSH
Breast Neoplasms | Dose-Response Relationship, Radiation | Female | Gene Frequency | Genetic Predisposition to Disease | Genetic Variation | Genome-Wide Association Study | Genotype | Humans | Male | Polymorphism, Single Nucleotide | Prospective Studies | Prostatic Neoplasms | Radiation Injuries | Radiotherapy, Adjuvant | Radiotherapy, Intensity-Modulated | Adverse effects | Genetics | Genome-wide association scan | Late toxicity | Radiotherapy
Resumen
BACKGROUND AND PURPOSE: This study was designed to identify common single nucleotide polymorphisms (SNPs) associated with toxicity 2years after radiotherapy. MATERIALS AND METHODS: A genome wide association study was performed in 1850 patients from the RAPPER study: 1217 received adjuvant breast radiotherapy and 633 had radical prostate radiotherapy. Genotype associations with both overall and individual endpoints of toxicity were tested via univariable and multivariable regression. Replication of potentially associated SNPs was carried out in three independent patient cohorts who had radiotherapy for prostate (516 RADIOGEN and 862 Gene-PARE) or breast (355 LeND) cancer. RESULTS: Quantile-quantile plots show more associations at the P<5x10(-7) level than expected by chance (164 vs. 9 for the prostate cases and 29 vs. 4 for breast cases), providing evidence that common genetic variants are associated with risk of toxicity. Strongest associations were for individual endpoints rather than an overall measure of toxicity in all patients. However, in general, significant associations were not validated at a nominal 0.05 level in the replication cohorts. CONCLUSIONS: This largest GWAS to date provides evidence of true association between common genetic variants and toxicity. Associations with toxicity appeared to be tumour site-specific. Future GWAS require higher statistical power, in particular in the validation stage, to test clinically relevant effect sizes of SNP associations with individual endpoints, but the required sample sizes are achievable.

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