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Objective: To elucidate the association of TNF-alpha-308G/A gene functional polymorphism with the development and progression of colorectal cancer., Methods: PCR-RFLP was employed to detect the TNF-alpha-308 G/A genotypes in 157 colorectal cancer patients and 117 healthy controls., Results: The frequency of TNF-alpha-308 genotype and allele were not significantly different between colorectal cancer patients and healthy controls (genotype chi(2)=1.054, P=0.591, allele chi(2)=0.404, P=0.525). The frequency of A/A genotype and A allele in III+IV stage (62 patients in total) were higher than those in I+II stages (85 patients in total) (A allele: 22.6% vs 12.9%, A/A genotype: 8.1% vs 1.2%), and the differences were significant (genotype P=0.048, OR=7.368, 95% CI=0.839-64.743, allele chi(2)=4.720, P=0.03, OR=1.962, 95% CI=1.061-3.628). The frequency of TNF-alpha-308 genotype were not significantly different among different colorectal cancer grades (chi(2)=3.009,P=0.591)., Conclusion: TNF-alpha-308G/A gene polymorphism is not associated with the development of colorectal cancer, but TNF-alpha-308 A/A genotype and A allele are related to the progression of colorectal cancer.

Objective: To investigate the association between VEGF gene 936 T/C polymorphism and colorectal cancer together with anastomotic leakage., Methods: Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was used to detect the VEGF 936 T/C genotypes in colorectal cancer patients and healthy controls., Results: There was no significant difference in the frequency of VEGF 936 C/C genotype or C allele between colorectal cancer patients and healthy controls (P > 0.05). The C/C genotype or C allele in colorectal cancer patients with anastomotic leakage was less frequently found than in the group without anastomotic leakage (P < 0.05)., Conclusions: VEGF 936 C/C genotype or C allele is not related to the development of colorectal cancer, but they can reduce the risk of anastomotic leakage after surgery in colorectal cancer patients.