OBJECTIVETo investigate the association between VEGF gene 936 T/C polymorphism and colorectal cancer together with anastomotic leakage.

METHODSPolymerase 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.

RESULTSThere 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).

CONCLUSIONSVEGF 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.

Adult ; Aged ; Aged, 80 and over ; Alleles ; Colorectal Neoplasms ; genetics ; surgery ; Digestive System Fistula ; etiology ; genetics ; Endothelial Growth Factors ; genetics ; Female ; Gene Frequency ; Genotype ; Humans ; Male ; Middle Aged ; Polymerase Chain Reaction ; Polymorphism, Restriction Fragment Length ; Polymorphism, Single Nucleotide ; Postoperative Complications ; etiology ; Surgical Stomas ; adverse effects

OBJECTIVETo elucidate the association of TNF-alpha-308G/A gene functional polymorphism with the development and progression of colorectal cancer.

METHODSPCR-RFLP was employed to detect the TNF-alpha-308 G/A genotypes in 157 colorectal cancer patients and 117 healthy controls.

RESULTSThe 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).

CONCLUSIONTNF-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.

Adult ; Aged ; Aged, 80 and over ; Alleles ; Case-Control Studies ; Colorectal Neoplasms ; genetics ; pathology ; Female ; Gene Frequency ; Genetic Predisposition to Disease ; Genotype ; Humans ; Male ; Middle Aged ; Neoplasm Staging ; Polymorphism, Single Nucleotide ; Tumor Necrosis Factor-alpha ; genetics