title: Endoscopic Resection for Undifferentiated-Type Early Gastric Cancer: Immediate Endoscopic Outcomes and Long-Term Survivals.
abstract: Endoscopic resection (ER) is considered carefully as a curative treatment option for selected cases of undifferentiated-type early gastric cancer (UEGC). This study investigated immediate endoscopic and long-term survival outcomes of patients with UEGC treated with ER.
  
  
  
  A review of a database of 2483 EGC consecutively enrolled patients who underwent ER between January 2004 and December 2010 identified 101 patients with UEGC who met the expanded indications. Outcomes were investigated in these patients.
  
  
  
  The rates of R0 en bloc and curative resection were 86 and 70 %, respectively. Of 30 tumors non-curatively resected, 17 were larger than 20 mm in diameter, 12 had positive resection margins, and 13 had submucosal or lymphovascular invasion on resection pathology. ER-related complications occurred in 12 patients (12 %), with all complications treated endoscopically without surgery. The median ER procedure time was 26 min [interquartile range (IQR) 20-39 min]. Only tumor location in the lower part of the stomach was significantly associated with curative ER (P = 0.038). Tumor recurrence was observed in seven patients at a median 17 months (IQR 12-47 months) after ER. During a median follow-up of 60 months (IQR 48-80 months), the 5-year overall mortality rates were 5 % in the curative and 4 % in the non-curative resection groups (P = 0.927). There were no gastric cancer-related deaths.
  
  
  
  ER shows acceptable immediate endoscopic and long-term survival outcomes in selected patients with UEGC.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Ji Yong
authors.initials: JY
authors.lastname: Ahn
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Hee Jung
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Park
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Jeong Hoon
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Kwi-Sook
authors.initials: KS
authors.lastname: Choi
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Kee Wook
authors.initials: KW
authors.lastname: Jeong
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Do Hoon
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Kee Don
authors.initials: KD
authors.lastname: Choi
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea. hjsong@amc.seoul.kr.
authors.forename: Ho June
authors.initials: HJ
authors.lastname: Song
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Gin Hyug
authors.initials: GH
authors.lastname: Lee
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Korea.
authors.forename: Hwoon-Yong
authors.initials: HY
authors.lastname: Jung
mesh_terms: D002277:Carcinoma / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D005260:Female; D005773:Gastroscopy / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology*; D056910:Republic of Korea / Q000453:epidemiology; D012189:Retrospective Studies; D013270:Stomach / Q000473:pathology; D013274:Stomach Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*
keywords: Endoscopic resection; Stomach; Treatment outcome; Undifferentiated carcinoma