Tumor necrosis factor-α polymorphism in helicobacter pylori associated gastric carcinoma
Background: Gastric cancer (GC) is the leading cause of cancer death in the world. Chronic inflammation is a predisposing factor of gastric carcinogenesis. TNF-α is a key pro-inflammatory cytokine secreted by macrophages and causes development of malignant diseases. It also plays an important role in chronic inflammation caused by Helicobacter Pylori. Therefore, TNF-α polymorphisms is studied in Helicobacter Pylori infected gastric cancer.
Objective: To find out the high risk group of Helicobacter Pylori infected gastric cancer cases in Asian and Caucasian people.
Methods: A total of 130 GC cases and 103 healthy controls from Jichi Medical School, Japan were studied. TNF-α genotype and allele frequency were studied by Restriction Fragment Length Polymorphism (RFLP).
Results: Among the study population TNFa-308A was less frequent in Asian people than those of Caucasian. TNFa-238G allele was more frequent in H. pylori positive GC (p<0.036) cases.
Conclusion: Findings of the study suggest that TNF-238G polymorphism of TNF-α gene may be closely associated with susceptibility to Helicobacter Pylori infected gastric cancer in Asian patients. This might be due to high cytokine production by TNF-238G allele.
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