Associations between genetic polymorphisms of glutathione S-transferase M1 and T1, smoking and susceptibility to colorectal cancer: a case-control study.
- Author:
Kun CHEN
1
;
Qin-ting JIANG
;
Xin-yuan MA
;
Kai-yan YAO
;
Shu-guang LENG
;
Wei-ping YU
;
Hai-guang ZHOU
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Aged; Aged, 80 and over; Case-Control Studies; Colonic Neoplasms; enzymology; genetics; Female; Genotype; Glutathione Transferase; genetics; Humans; Male; Middle Aged; Polymorphism, Genetic; Rectal Neoplasms; enzymology; genetics; Risk Factors; Smoking; adverse effects
- From: Chinese Journal of Oncology 2004;26(11):645-648
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the associations between genetic polymorphisms of glutathione S-transferase M1 and T1 (GSTM1 and GSTT1), smoking and susceptibility to colorectal cancer.
METHODSA case-control study of 126 patients and 343 healthy controls was conducted to investigate the role of GSTM1 and GSTT1 polymorphisms in colorectal cancer. Genotypes of GSTM1 and GSTT1 polymorphisms were analyzed by multiplex allele-specific polymerase chain reaction (PCR).
RESULTSThe frequencies of GSTM1 null and GSTT1 null genotypes were 55.5% and 20.4%, respectively. After adjustment for age and sex, among those with GSTT1 null genotype, the GSTM1 null genotype had a significant increased risk of rectal cancers compared to GSTM1 non-null genotype (OR=9.74, 95% CI, 1.13 - 83.85). A 2.22-fold risk of colon cancers was associated with GSTM1 null genotype compared to GSTM1 non-null genotype among current smokers (P >0.05). Individuals with GSTT1 null genotype and currently smoking had a significant risk of colon cancers (OR = 4.55, 95% CI, 1.14 - 18.17), and rectal cancers (OR = 4.60, 95% CI, 1.11 - 19.11).
CONCLUSIONThis study suggests that certain null GSTM1 and GSTT1 genotypes may be associated with an elevated risk of colorectal cancer which may be modified by interaction of the two genetic polymorphisms and cigarette smoking.
