A single nucleotide polymorphism in the MMP-9 promoter affects tumor progression and invasive phenotype of gastric cancer
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Matrix metalloproteinase-9 (MMP-9, gelatinase B) plays a key role in cancer invasion and metastasis by degradating the extracellular matrix (ECM) and basement membrane barriers. A cytosine (C)-thymidine (T) single nucleotide polymorphism (SNP) at position –1562 in the MMP-9 promoter is reported to affect expression of this gene. The purpose of this study was to investigate the relation between the –1562 C/T polymorphism and the development and progression of gastric cancer.
The study population included 177 gastric cancer patients and 224 healthy control subjects. The SNP in the MMP-9 promoter was analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and sequencing. Genotype frequencies were compared between patients and controls, and the association of genotypes with clinicopathological features was studied.
Genotype frequencies in gastric cancer patients were similar to those in control subjects (P = 0.223). However, significant association was found between degree of tumor invasion, clinical stage, and lymphatic invasion and the MMP-9 polymorphism in gastric cancer patients (P<0.05, for each).
Our results indicate that the T allele in the MMP-9 promoter is associated with the invasive phenotype of gastric cancer.
KeywordsMMP-9 SNP Gastric cancer Depth of tumor invasion Lymphatic invasion
Single nucleotide polymorphism
Restriction fragment length polymorphism
Polymerase chain reaction
We thank Masayoshi Takatani and Mutsumi Ueda, Department of Molecular Pathology, Hiroshima University Graduate School of Biomedical Sciences, for their excellent technical assistance and advice
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