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H an increased risk of gastric cancer in the Chinese population. At present, there are few reports about the association between the polymorphisms of GSTP1 and the risk of gastric cancer. Researchers in the USA [35] have reported that the GSTP1 genotype seemed not to be associated with the risk of gastric cancer and 842-07-9 site chronic get SPDP Crosslinker gastritis in a high-risk Chinese population. The results detected by Katoh et al [36] suggest the frequency of theGenetic Susceptibility to Gastric CarcinogenesisTable 4. Interaction between GSTP1 Ile/Val polymorphism and H. pylori infection, smoking, and alcohol consumption in atrophic gastritis.superficial gastritis vs. atrophic gastritis Ile/Ile Ile/Val 186/84 0.803(0.584?.102) 61/146 4.253(2.993?.045) Val/Val 10/9 1.599(0.638?.011) 5/14 4.976(1.763?4.047) Ile/Val + Val/Val 196/93 0.843(0.619?.148) 66/160 4.308(3.062?.061)H. pylori(?superficial gastritis/atrophic gastritis OR (95 CI)311/175 17493865 1.000 110/255 4.12(3.082?.508)(+) superficial gastritis/atrophic gastritis OR (95 CI)P = 0.Smoking (? superficial gastritis/atrophic gastritis OR (95 CI) (+) superficial gastritis/atrophic gastritis OR (95 CI) 197/233 1.000 107/109 0.861(0.621?.195) 117/122 0.882(0.642?.21) 74/70 0.8(0.548?.167) P = 0.621 Alcohol (? superficial gastritis/atrophic gastritis OR (95 CI) (+) superficial gastritis/atrophic gastritis OR (95 CI) 231/263 1.000 69/77 0.98(0.677?.419) 132/142 0.945(0.703?.27) 52/49 0.828(0.539?.27) P = 0.852 P values were adjusted for age and sex. doi:10.1371/journal.pone.0047178.tP = 0.6/13 1.832 (0.684?.909) 4/2 0.423(0.077?.333) P = 0.308 9/12 1.171(0.485?.829) 1/3 2.635(0.272?5.507) P = 0.P = 0.123/135 0.937(0.687?.279) 78/72 0.782(0.538?.136) P = 0.566 141/154 0.959(0.719?.281) 53/52 0.862(0.565?.313) P = 0.GSTP1 allele Val is increasing in gastric cancer in the Japanese population, but this has not yet obtained statistical significance. We found that there was a significant difference in the GSTP1 polymorphic types between the gastric cancer cases and superficial gastritis controls. The frequency of GSTP1 Val/Val genotypes was significantly higher in the gastric cancer group, compared with Ile/Ile or Ile/Val genotypes. The analysis showed a statisticallysignificant 3.324-fold increase in gastric cancer risk associated with the GSTP1 allele Val. This suggests that individuals from Northern China with GSTP1 allele Val have an increased risk of gastric cancer, but not atrophic gastritis (one of the precancerous conditions). However, it’s worth mentioning that in subgroups aged .60 years, an increased atrophic gastritis risk associated with Ile/Val genotypes was more evident. These findings revealed thatTable 5. Interaction between GSTP1 Ile/Val polymorphism and H. pylori infection, 24195657 smoking, and alcohol consumption in gastric cancer.superficial gastritis vs gastric cancer Ile/Ile Ile/Val 153/92 0.906(0.655?.252) 40/82 3.087(2.018?.724) Val/Val 10/19 2.861(1.298?.306) 4/26 9.789(3.356?8.555) Ile/Val + Val/Val 163/111 1.026(0.752?.399) 44/108 3.696(2.475?.521)H. pylori(?superficial gastritis/gastric cancer OR (95 CI)253/168 1.000 90/163 2.727(1.975?.767)(+) superficial gastritis/gastric cancer OR (95 CI)P = 0.Smoking (? superficial gastritis/gastric cancer OR (95 CI) (+) superficial gastritis/gastric cancer OR (95 CI) 136/69 1.000 100/82 1.616(1.071?.439) 72/32 0.876(0.527?.455) 67/47 1.383(0.862?.217)P = 0.5/5 1.971(0.552?.04) 4/12 5.913(1.839?9.015)P = 0.77/37 0.947(0.582?.542) 71/59 1.638(1.044?.571)P = 0.Al.H an increased risk of gastric cancer in the Chinese population. At present, there are few reports about the association between the polymorphisms of GSTP1 and the risk of gastric cancer. Researchers in the USA [35] have reported that the GSTP1 genotype seemed not to be associated with the risk of gastric cancer and chronic gastritis in a high-risk Chinese population. The results detected by Katoh et al [36] suggest the frequency of theGenetic Susceptibility to Gastric CarcinogenesisTable 4. Interaction between GSTP1 Ile/Val polymorphism and H. pylori infection, smoking, and alcohol consumption in atrophic gastritis.superficial gastritis vs. atrophic gastritis Ile/Ile Ile/Val 186/84 0.803(0.584?.102) 61/146 4.253(2.993?.045) Val/Val 10/9 1.599(0.638?.011) 5/14 4.976(1.763?4.047) Ile/Val + Val/Val 196/93 0.843(0.619?.148) 66/160 4.308(3.062?.061)H. pylori(?superficial gastritis/atrophic gastritis OR (95 CI)311/175 17493865 1.000 110/255 4.12(3.082?.508)(+) superficial gastritis/atrophic gastritis OR (95 CI)P = 0.Smoking (? superficial gastritis/atrophic gastritis OR (95 CI) (+) superficial gastritis/atrophic gastritis OR (95 CI) 197/233 1.000 107/109 0.861(0.621?.195) 117/122 0.882(0.642?.21) 74/70 0.8(0.548?.167) P = 0.621 Alcohol (? superficial gastritis/atrophic gastritis OR (95 CI) (+) superficial gastritis/atrophic gastritis OR (95 CI) 231/263 1.000 69/77 0.98(0.677?.419) 132/142 0.945(0.703?.27) 52/49 0.828(0.539?.27) P = 0.852 P values were adjusted for age and sex. doi:10.1371/journal.pone.0047178.tP = 0.6/13 1.832 (0.684?.909) 4/2 0.423(0.077?.333) P = 0.308 9/12 1.171(0.485?.829) 1/3 2.635(0.272?5.507) P = 0.P = 0.123/135 0.937(0.687?.279) 78/72 0.782(0.538?.136) P = 0.566 141/154 0.959(0.719?.281) 53/52 0.862(0.565?.313) P = 0.GSTP1 allele Val is increasing in gastric cancer in the Japanese population, but this has not yet obtained statistical significance. We found that there was a significant difference in the GSTP1 polymorphic types between the gastric cancer cases and superficial gastritis controls. The frequency of GSTP1 Val/Val genotypes was significantly higher in the gastric cancer group, compared with Ile/Ile or Ile/Val genotypes. The analysis showed a statisticallysignificant 3.324-fold increase in gastric cancer risk associated with the GSTP1 allele Val. This suggests that individuals from Northern China with GSTP1 allele Val have an increased risk of gastric cancer, but not atrophic gastritis (one of the precancerous conditions). However, it’s worth mentioning that in subgroups aged .60 years, an increased atrophic gastritis risk associated with Ile/Val genotypes was more evident. These findings revealed thatTable 5. Interaction between GSTP1 Ile/Val polymorphism and H. pylori infection, 24195657 smoking, and alcohol consumption in gastric cancer.superficial gastritis vs gastric cancer Ile/Ile Ile/Val 153/92 0.906(0.655?.252) 40/82 3.087(2.018?.724) Val/Val 10/19 2.861(1.298?.306) 4/26 9.789(3.356?8.555) Ile/Val + Val/Val 163/111 1.026(0.752?.399) 44/108 3.696(2.475?.521)H. pylori(?superficial gastritis/gastric cancer OR (95 CI)253/168 1.000 90/163 2.727(1.975?.767)(+) superficial gastritis/gastric cancer OR (95 CI)P = 0.Smoking (? superficial gastritis/gastric cancer OR (95 CI) (+) superficial gastritis/gastric cancer OR (95 CI) 136/69 1.000 100/82 1.616(1.071?.439) 72/32 0.876(0.527?.455) 67/47 1.383(0.862?.217)P = 0.5/5 1.971(0.552?.04) 4/12 5.913(1.839?9.015)P = 0.77/37 0.947(0.582?.542) 71/59 1.638(1.044?.571)P = 0.Al.

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