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Impaired fasting glucose, single-nucleotide polymorphisms, and risk for colorectal cancer in Koreans
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Keum Ji Jung, Miyong To Kim, Sun Ha Jee
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Epidemiol Health. 2016;38:e2016002. Published online January 6, 2016
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DOI: https://doi.org/10.4178/epih.e2016002
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Abstract
OBJECTIVES
Numerous studies have demonstrated that fasting serum glucose (FSG) levels and certain single-nucleotide polymorphisms (SNPs) are related to an increased risk of colorectal cancer (CRC); however, their combined effects are still unclear.
METHODS Of a total of 144,527 men and women free of cancer at baseline, 317 developed CRC during 5.3 years of follow-up. A case-cohort study (n=1,691) was used, consisting of participants with a DNA sample available. Three well-known SNPs (rs3802842, rs6983267, rs10795668) were genotyped. Hazard ratios (HR) and 95% confidence intervals (CI) of CRC, colon and rectal cancer were calculated, with the Cox proportional hazard models.
RESULTS The crude incidence rates per 100,000 person-years were 41.1 overall, 48.4 for men, and 29.3 for women. Among participants with dysglycemia, SNPs rs3802842 and rs6983267 were both associated with an increased risk of CRC (HR, 3.2; 95% CI, 1.9 to 5.5 and HR, 1.8; 95% CI, 1.1 to 3.1, respectively) and rectal cancer (HR, 3.4; 95% CI, 1.8 to 6.6 and HR, 3.3; 95% CI, 1.6 to 7.1, respectively). The interaction effect of dysglycemia and SNPs was positive, that is, resulted in an elevated risk of CRC, but was not statistically significant.
CONCLUSIONS This study demonstrates that both high FSG and certain SNPs are major risk factors for CRC and rectal cancer but that they did not interact synergistically. The difference in effect size of the SNPs according to CRC subtype (i.e., colon or rectal cancer) and presence of dysglycemia merits further research.
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Summary
Korean summary
본 연구에서는 공복혈당농도와 대장암과 관련된 단일염기다형성(SNP)과의 관련성을 살펴 보았다. 높은 공복혈당농도와 단일염기다형성(SNP_rs3802842, rs6983267)은 대장암의 주요한 위험요인이었으나, 두 가지 요인의 상호작용으로 인한 시너지 효과는 없는 것으로 나타났다. 대장암의 아형에 따른 다른 효과 크기와 이상혈당증 유무에 따른 향후 연구가 더 필요할 것으로 생각된다.
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Citations
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