title: [Significance of microsatellite instability in early gastric cancer treated by endoscopic submucosal dissection].
abstract: OBJECTIVE
  Microsatellite instability (MSI) is defined as a change of any length due to either insertion or deletion of repeating units, in a microsatellite within a tumor when compared to normal tissue. MSI is closely related with genetic instability, particularly in hereditary nonpolyposis colorectal cancer. MSI is found in 10-50% of all gastric cancers, suggesting that MSI may play an important role in carcinogenesis. The aim of this study was to investigate the relationship between microsatellite instability and clinicopathologic features in early gastric cancers (EGCs) treated by endoscopic submucosal dissection (ESD).
  
  
  METHODS
  We analyzed clinicopathological features of 95 specimens of EGCs including MSI, histologic type, mucin phenotype, p53, VEGF, location of cancer, depth of invasion, incidence of synchronous and metachronous cancer, age, and gender derived from 94 patients, treated by ESD during recent 19 months were analyzed in this study.
  
  
  RESULTS
  According to microsatellite stability, MSI was observed in 13 (13.7%) cases of 95 specimens. The incidence of MSI was increased in patients with cancer at lower part of stomach and female gender. There was no significant relation between MSI and clinicopathologic features including histologic type, mucin phenotype, p53, VEGF, and depth of invasion.
  
  
  CONCLUSIONS
  Our results demonstrate that there is no relationship between MSI and clinicopathologic features except tumor location and gender in ECGs treated by ESD. However, further studies are needed to evaluate the significance of MSI in EGCs.
authors.affiliation: Department of Internal Medicine, Institute of Digestive Disease, SoonChunHyang University College of Medicine, Seoul, Korea.
authors.forename: Kyoung Min
authors.initials: KM
authors.lastname: Kim
authors.forename: Yeon Soo
authors.initials: YS
authors.lastname: Kim
authors.forename: Joo Young
authors.initials: JY
authors.lastname: Cho
authors.forename: In Sup
authors.initials: IS
authors.lastname: Jung
authors.forename: Wan Jung
authors.initials: WJ
authors.lastname: Kim
authors.forename: Ik Seong
authors.initials: IS
authors.lastname: Choi
authors.forename: Chang Beom
authors.initials: CB
authors.lastname: Ryu
authors.forename: Jin Oh
authors.initials: JO
authors.lastname: Kim
authors.forename: Joon Seong
authors.initials: JS
authors.lastname: Lee
authors.forename: So Young
authors.initials: SY
authors.lastname: Jin
authors.forename: Chan Sup
authors.initials: CS
authors.lastname: Shim
authors.forename: Boo Sung
authors.initials: BS
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004252:DNA Mutational Analysis; D003627:Data Interpretation, Statistical; D016099:Endoscopy, Gastrointestinal; D005260:Female; D006801:Humans; D008297:Male; D053842:Microsatellite Instability; D008875:Middle Aged; D009077:Mucins / Q000032:analysis; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000235:genetics / Q000601:surgery; D016159:Tumor Suppressor Protein p53 / Q000032:analysis; D042461:Vascular Endothelial Growth Factor A / Q000032:analysis
chemical_list: D009077:Mucins; D016159:Tumor Suppressor Protein p53; D042461:Vascular Endothelial Growth Factor A