title: Prognostic potential of glutathione S-transferase M1 and T1 null genotypes for gastric cancer progression.
abstract: To improve understanding of glutathione S-transferase (GST) behavior in terms of a development and prognostic factor for gastric adenocarcinoma, we investigated the association between the GSTM1 and GSTT1 null genotypes and gastric cancer risk or the prognostic value of the GSTM1 and GSTT1 null genotypes was evaluated. Using a polymerase chain reaction-based method, the frequencies of GSTM1 and GSTT1 genotypes and prognostic factors, such as staging, differentiation, and histologic type (intestinal vs. diffuse), were evaluated in 80 patients with curatively resected primary gastric adenocarcinoma. The frequencies of GSTM1 and GSTT1 null individuals were higher in the gastric cancer group, but the differences were not statistically significant (for GSTM1 null odds ratio (OR)=0.86; 95% confidence interval (CI)=0.49-1.51 and for GSTT1, OR=0.97; 95% CI=0.55-1.71). Since the GSTM1 and GSTT1 null genotypes are potential indicators of gastric adenocarcinoma, we examined the relationship between the GSTM1 and GSTT1 genotypes and prognostic factors. In terms of the histologically diffuse type of cancer, GSTM1 indicated an approximately 3.24-fold increase (OR=3.24; 95% CI=1.05-10.17). With respect to gastric cancer differentiation, the frequency of the GSTM1 null genotype was linked with a statistically significant increase in risk (3.42-fold) for the high-grade type (OR=3.42; CI=1.02-13.24). Our results indicate that there is no obvious relationship between GSTM1 and GSTT1 polymorphisms and the development of gastric cancer. However, in Korean gastric adenocarcinoma patients the GSTM1 null genotype appears to be associated with a poorer prognosis.
authors.affiliation: Department of Internal Medicine, Genomic Research Center for Immune Disorder, Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Chonbuk 570-749, South Korea.
authors.forename: Suck Chei
authors.initials: SC
authors.lastname: Choi
authors.forename: Ki Jung
authors.initials: KJ
authors.lastname: Yun
authors.forename: Tae Hyeon
authors.initials: TH
authors.lastname: Kim
authors.forename: Hyun Ju
authors.initials: HJ
authors.lastname: Kim
authors.forename: Seh Geun
authors.initials: SG
authors.lastname: Park
authors.forename: Gyung Jae
authors.initials: GJ
authors.lastname: Oh
authors.forename: Soo Cheon
authors.initials: SC
authors.lastname: Chae
authors.forename: Gyung-Jae
authors.initials: GJ
authors.lastname: Oh
authors.forename: Yong Ho
authors.initials: YH
authors.lastname: Nah
authors.forename: Jeong Joong
authors.initials: JJ
authors.lastname: Kim
authors.forename: Hun Tag
authors.initials: HT
authors.lastname: Chung
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology / Q000401:mortality / Q000473:pathology*; D002454:Cell Differentiation; D018450:Disease Progression; D005982:Glutathione Transferase / Q000172:deficiency / Q000235:genetics*; D006801:Humans; D007723:Korea / Q000453:epidemiology; D009363:Neoplasm Proteins / Q000172:deficiency / Q000235:genetics*; D011379:Prognosis; D012306:Risk; D013274:Stomach Neoplasms / Q000201:enzymology / Q000401:mortality / Q000473:pathology*
chemical_list: D005982:Glutathione Transferase; D009363:Neoplasm Proteins; C413545:glutathione S-transferase T1