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Thrombospondin-1 plays an important role in cancer development and progression. This study investigated if a correlation exists between single-nucleotide polymorphisms (SNPs) in the Thrombospondin-1 gene (THBS1) and gastric cancer. We conducted a case-control study on a randomly recruited population of 283 patients and 283 healthy individuals from the city of Fuzhou in Southeast China. Individuals were genotyped for four SNPs (rs1478604 AG, rs2228261 CT, rs2292305 TC, and rs3743125 CT) in THBS1 using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. THBS1 genotypic distributions between the case and control groups were tested for correlations with cancer development. Comparisons between the case and control groups showed no significant differences in the genotypic distributions of rs1478604 AG, rs2228261 CT, and rs3743125 CT. However, we found a statistically significant association between homozygous CC of THBS1 rs2292305 TC and development of highly differentiated carcinoma (HDC). The rs1478604 AG variant was found to be associated with invasion and lymph node metastasis in gastric cancer. After logistic regression and stratification analysis, rs1478604 AG was more strongly associated with lymph node metastasis in HDC gastric cancer. The power to detect an effect for rs1478604 AG in HDC was 90%. These findings indicate that the THBS1 rs1478604 AG variant is linked with differential risks for gastric cancer nodal metastasis. These results support further investigation of THBS1 as a potential therapeutic target in gastric cancer.

A MYCL1 single nucleotide polymorphism, rs3134613, has been reported to play an important role in many cancers. However, its involvement in gastric cancer is controversial. The aim of the study was to investigate the influence of rs3134613 on the development and progression of gastric cancer in a southeast Chinese population. Genotypes were analyzed by polymerase chain reaction-restriction fragment length polymorphism in 317 gastric cancer patients and 200 cancer-free controls. Data show that the risk of diffuse-type gastric cancer in carriers with the T allele (T/T or G/T genotype) was higher than that in carriers with the G/G genotype (adjusted odds ratio [OR] = 2.601, 95% confidence interval [CI] = 1.431-4.895, p = 0.003). The risk of diffuse-type gastric cancer in T allele carriers was higher than that in G allele carriers (adjusted OR = 1.594, 95% CI = 1.157-2.286, p = 0.009). The risk of poorly differentiated cancer in carriers with the T allele (T/T or G/T genotype) was higher than that in carriers with the G/G genotype (adjusted OR = 1.963, 95% CI = 1.156-3.325, p = 0.015). The results demonstrate that rs3134613 is associated with susceptibility to diffuse-type gastric cancer and with differentiation of gastric cancer. rs3134613 may be used as a potential marker to identify individuals who are at high risk of diffuse-type gastric cancer.