Carcinogenesis Advance Access originally published online on August 19, 2004
Carcinogenesis 2004 25(12):2519-2524; doi:10.1093/carcin/bgh269
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Carcinogenesis vol.25 no.12 © Oxford University Press 2004; all rights reserved.
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The functional SNP in the matrix metalloproteinase-3 promoter modifies susceptibility and lymphatic metastasis in esophageal squamous cell carcinoma but not in gastric cardiac adenocarcinoma
Hebei Cancer Institute and 1 The Fourth Affiliated Hospital, Hebei Medical University, Jiankanglu 12, Shijiazhuang 050011, Hebei Province, China
2 To whom correspondence should be addressed. Tel: +86 311 6093338; Fax: +86 311 6077634; Email: jianhuizh{at}hotmail.com
The matrix metalloproteinases (MMPs), a family of proteolytic enzymes that degrade different components of the extracellular matrix, play important roles in tumor development and invasion. A single adenine insertion/deletion polymorphism (6A/5A) in the MMP3 promoter region causes transcriptional elevation. The aim of this study was to assess the effects of this single nucleotide polymorphism (SNP) on the development and clinical staging of esophageal squamous cell carcinoma (ESCC) and gastric cardiac adenocarcinoma (GCA). The MMP3 SNP was genotyped by polymerase chain reaction-restriction fragment length polymorphism analysis in 417 cancer patients (234 ESCC and 183 GCA) and 350 controls in north China. The overall distribution of the MMP3 SNP in ESCC and GCA patients was not significantly different from that in healthy controls. However, smoking individuals with the 5A/5A or 5A/6A genotype were significantly more common in ESCC patients than in controls (37.5 versus 23.3%, 
2 = 5.13, P = 0.02). Thus, smokers with at least one 5A allele had a significantly increased risk of ESCC, compared with 6A homozygotes (age and sex adjusted OR = 1.95, 95% CI = 1.08–3.53). The significant difference in the SNP distribution between ESCC patients, GCA patients and controls was not observed when stratified by family history of upper gastrointestinal cancer. In addition, the frequency of the 5A/5A + 5A/6A genotypes in ESCC patients with and without lymphatic metastasis was significantly different (45.8 versus 27.8%, 2 = 4.56, P = 0.03). Therefore, patients with at least one 5A allele were significantly more prone to lymphatic metastasis of ESCC. In contrast, no significant difference in the SNP distribution between patients with and without lymphatic metastasis was observed in GCA. The present study suggests that the MMP3 promoter SNP might be associated with a risk of development and lymphatic metastasis in ESCC but not in GCA.
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