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XRCC2 and XRCC3 Polymorphisms Are Not Associated with Risk of Colorectal Adenoma

¹ Department of Epidemiology, ² Department of Nutrition, and ³ Harvard Center for Cancer Prevention, Harvard School of Public Health, Boston, Massachusetts, and ⁴ Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, 181 Longwood Avenue, Boston, Massachusetts

Requests for reprints: David J. Hunter, Channing Laboratory, 181 Longwood Avenue, Boston, MA 02115. Phone: (617) 525-2718; Fax: (617) 525-2008. E-mail: david.hunter.{at}channing.harvard.edu

	Introduction

Top Introduction Materials and Methods Results Discussion References

 
The XRCC2 and XRCC3 proteins participate in homologous recombination and DNA double-strand break repair to maintain chromosomal stability. Coding-region variants in XRCC2 (Arg188His) and XRCC3 (Thr241Met) have been associated with cancers at several sites (1-3). The XRCC3 241Met homozygous variant has also been associated with increased DNA adduct levels, suggesting a role for this protein in repairing DNA adducts (2).

We assessed the association between XRCC2 R188H, XRCC3 T241M, and two intronic XRCC3 polymorphisms and risk of colorectal adenoma in two case-control studies nested in the Nurses' Health Study (NHS) and the Health Professionals Follow-up Study (HPFS) cohorts. We hypothesize that XRCC2 and XRCC3 polymorphisms modify risk of colorectal adenoma associated with smoking and alcohol intake; both established risk factors for colorectal adenoma (4). In addition, we examine the XRCC2 and XRCC3 polymorphisms and their potential interaction with plasma and dietary folate in relation to risk of colorectal adenoma.

	Materials and Methods

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Detailed information about the design of the NHS (cases, n = 556; controls, n = 557) and HPFS (cases, n = 376; controls, n = 725) nested case-control studies has been published previously (4). Genotyping of coding region XRCC2 R188H (rs3218536) and XRCC3 T241M (rs861539), and intronic XRCC3 A>G 4541 (rs1799794) and XRCC3 A>G 17893 (rs1799796) single nucleotide polymorphisms was carried out using the TaqMan allelic discrimination system (Applied Biosystems, Foster City, CA). Plasma folate was measured for some of the NHS nested case-control participants (cases, n = 345; controls, n = 333) (5). Odds ratios and 95% confidence intervals were calculated using conditional and unconditional logistic regression and were adjusted for established colorectal cancer risk factors (4). Interactions between genotype and exposure to smoking, dietary folate, plasma folate, and alcohol intake were tested by the likelihood ratio test.

	Results

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The distribution of the XRCC2 and XRCC3 genotypes conformed to Hardy-Weinberg expectations and these polymorphisms were not in linkage disequilibrium. We observed no association between XRCC2 and XRCC3 genotype and risk of colorectal adenoma in separate and combined analyses of women and men from the NHS and HPFS cohorts, respectively (Table 1). In addition, no difference in risk was found between early (tubular histology and <1 cm in diameter) and advanced (villous or tubulovillous histology and 1 cm in diameter) lesions in men and women (data not shown). No statistically significant interactions were observed between genotype and smoking, alcohol intake, dietary folate, or plasma folate (data available from www.channing.harvard.edu/nhs/pub.html#xrcc2004). Cigarette smoking increased risk of colorectal adenoma in our study for both men and women, regardless of XRCC2 or XRCC3 genotype. In addition, alcohol intake increased risk of colorectal adenoma in men for all genotypes. There was no evidence that the effect of XRCC2 or XRCC3 genotype varied by plasma or dietary folate in NHS.

	Discussion

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	Acknowledgments

 
We thank the participants of the Nurses' Health Study and the Health Professionals Follow-up Study for their cooperation and participation. The authors are grateful to Hardeep Ranu for technical assistance.

	Footnotes

 
Grant support: Research grants CA70817, CA 87969, and CA 55075 from NIH. G. Tranah is supported by a training grant CA09001-27 from NIH.

The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Received 1/13/04; accepted 2/ 3/04.

	References

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3. Rafii S, O'Regan P, Xinarianos G, et al. A potential role for the XRCC2 R188H polymorphic site in DNA-damage repair and breast cancer. Hum Mol Genet 2002;11:1433-38.[Abstract/Free Full Text]
4. Giovannucci E, Stampfer MJ, Colditz GA, et al. Folate, methionine, and alcohol intake and risk of colorectal adenoma. J Natl Cancer Inst 1993;85:875-84.[Abstract/Free Full Text]
5. Zhang SM, Willett WC, Selhub J, et al. Plasma folate, vitamin B6, vitamin B12, homocysteine, and risk of breast cancer. J Natl Cancer Inst 2003;95:373-80.[Abstract/Free Full Text]
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