[Significance of microsatellite instability in early gastric cancer treated by endoscopic submucosal dissection].
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.
Kim
Kyoung Min
KM
Department of Internal Medicine, Institute of Digestive Disease, SoonChunHyang University College of Medicine, Seoul, Korea.
Kim
Yeon Soo
YS
Cho
Joo Young
JY
Jung
In Sup
IS
Kim
Wan Jung
WJ
Choi
Ik Seong
IS
Ryu
Chang Beom
CB
Kim
Jin Oh
JO
Lee
Joon Seong
JS
Jin
So Young
SY
Shim
Chan Sup
CS
Kim
Boo Sung
BS
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
D009077:Mucins; D016159:Tumor Suppressor Protein p53; D042461:Vascular Endothelial Growth Factor A