title: Increased expression of matrix metalloproteinase-7 in invasive early gastric cancer.
abstract: BACKGROUND
  Matrix metalloproteinase-7 (MMP-7), a proteolytic enzyme, is suspected to play an important role in the progression of various cancers. To clarify the clinical importance of MMP-7, we retrospectively analyzed MMP-7 expression in gastric epithelial tumors.
  
  
  METHODS
  We tested 201 lesions (from 172 patients) of surgically or endoscopically resected gastric epithelial tumors (gastric cancer, 158 lesions; gastric adenoma, 32 lesions; hyperplastic polyp, 11 lesions). MMP-7 expression was immunohistochemically examined. Sections with immunostaining signals in more than 30% of tumor cells were judged to show positive expression.
  
  
  RESULTS
  MMP-7 was expressed in 33.3% (67/201) of all lesions. MMP-7-positive tumors were significantly more frequent in diffuse-type adenocarcinomas (62.2%; 28/45) compared with intestinal-type lesions (31.9%; 36/113; P < 0.001). Cancers invading the submucosa or deeper (60.5%; 46/76) were showed positivity significantly more frequently than mucosal cancers (22.0%; 18/82; P < 0.001). MMP-7-positive lesions increased with the progression of gastric epithelial tumors, including adenomas, mucosal cancers, and cancers invading the submucosal layer or deeper (P < 0.001). MMP-7 expression occurred significantly more often in lymphatic invasion-positive cancers (65.1%; 41/63) than in lymphatic invasion-negative cancers (24.2%; 23/95; P < 0.001).
  
  
  CONCLUSIONS
  The MMP-7-positive rate increased with the progression of gastric epithelial tumors, such as adenoma, mucosal cancer, and cancer invading the submucosal layer or deeper. MMP-7 was significantly associated with aggressive pathological phenotypes of cancer. The detection of the MMP-7 protein may be useful in pretherapeutic diagnosis.
authors.affiliation: Department of Gastroenterology and Hepatology, Yamaguchi University School of Medicine, 1-1-1 Minamikogushi, Ube 755-8505, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kitoh
authors.forename: Hideo
authors.initials: H
authors.lastname: Yanai
authors.forename: Yuki
authors.initials: Y
authors.lastname: Saitoh
authors.forename: Youhei
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsubara
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kitoh
authors.forename: Tomoharu
authors.initials: T
authors.lastname: Yoshida
authors.forename: Kiwamu
authors.initials: K
authors.lastname: Okita
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology* / Q000473:pathology; D000231:Adenocarcinoma, Papillary / Q000201:enzymology / Q000473:pathology; D000236:Adenoma / Q000201:enzymology / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018279:Carcinoma, Signet Ring Cell / Q000201:enzymology / Q000473:pathology; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D020783:Matrix Metalloproteinase 7 / Q000378:metabolism*; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D012189:Retrospective Studies; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000473:pathology
chemical_list: D020783:Matrix Metalloproteinase 7