[A case-control study on the polymorphisms of methylenetetrahydrofolate reductases, drinking interaction and susceptibility in colorectal cancer].
OBJECTIVE
To investigate the relationship between methylenetetrahydrofolate reductases (MTHFR) polymorphisms and colorectal cancer susceptibility.


METHODS
A case-control study of 126 patients and 343 healthy controls was conducted to investigate the roles of MTHFR C677T and A1298C polymorphisms in colorectal cancer development. Genotypes of C677T and A1298C polymorphisms were analyzed by polymerase chain resction-restriction fragment length polymorphism (PCR-RFLP) methods.


RESULTS
The frequencies of MTHFR 677T and 1298C allele were 39.7% and 17.1%, respectively. After adjustment for age and sex, the MTHFR 1298C alleles seemed to have reduced association on the risk of colorectal cancer comparing to wild types. Among those with 677T and 1298A alleles, a decreased risk of colorectal cancer was observed: a 4-fold decrease in colorectal cancer risk (OR = 0.552, 95% CI: 0.265 - 1.150) in those with 677T and 1298C alleles. Men who were ex-drinkers and with MTHFR 1298C allele had a 2-fold increase in risk of colorectal cancer (OR = 3.307, 95% CI: 0.521 - 17.698) while no increased risk was seen among those current-drinkers.


CONCLUSIONS
This study suggested that certain MTHFR C677T and A1298C might be associated with the risk of colorectal cancer development. The interaction between MTHFR 1298AC polymorphisms and ex-drinking might also serve as a risk factor of colorectal cancer.
Department of Epidemiology and Statistical, School of Medicine, Zhejiang University, Hangzhou 310031, China.
Qin-ting
QT
Jiang
Kun
K
Chen
Xin-yuan
XY
Ma
Xiao-ping
XP
Miao
Kai-yan
KY
Yao
Wei-ping
WP
Yu
Ling-yun
LY
Li
Yi-min
YM
Zhu
Hai-guang
HG
Zhou
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000428:Alcohol Drinking; D016022:Case-Control Studies; D002681:China; D015179:Colorectal Neoplasms / Q000201:enzymology / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D006801:Humans; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012307:Risk Factors
D042965:Methylenetetrahydrofolate Reductase (NADPH2)