title: Accuracy of high-frequency catheter-based endoscopic ultrasonography according to the indications for endoscopic treatment of early gastric cancer.
abstract: OBJECTIVE
  The development of endoscopic treatment, such as endoscopic submucosal dissection, extends the indications for endoscopic resection in patients with early gastric cancer (EGC). Endoscopic ultrasonography (EUS) is the first-choice imaging modality for determining the depth of invasion of gastric cancer. The aim of the present study was to prospectively assess the accuracy of EUS for determining the depth of EGC, according to the accepted/extended indications.
  
  
  METHODS
  We prospectively included a total of 181 lesions in 178 patients, with an endoscopic diagnosis of EGC, who underwent EUS for staging the depth of tumor invasion using a 20-MHz catheter probe. We investigated the accuracy of EUS for determining the depth of endoscopically-suspected EGC and then analyzed the difference in the accuracy of EUS according to the accepted/extended indications.
  
  
  RESULTS
  Of the 178 patients, five patients were dropped because of the absence of final histological results. For the 176 lesions in 173 patients, the accuracy of EUS assessment for the depth of tumor invasion was 80.7% (142 of 176 lesions). The accuracy of EUS for the lesions with accepted indications and with extended indications was 97.6% (40 of 41 lesions) and 83.6% (46 of 57 lesions), respectively (P = 0.040). Of the lesions with extended indications, the accuracy of EUS decreased especially for the lesions with ulceration and those with minute submucosal invasion (79.2% and 42.9%, respectively).
  
  
  CONCLUSIONS
  The accuracy of EUS for the lesions with the extended indications was lower than that for the lesions with the accepted indications. In particular, lesions with ulceration and minute submucosal invasion should be carefully considered prior to endoscopic treatment by pretreatment EUS staging.
authors.affiliation: Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea. doc0224@chol.com
authors.forename: Gwang Ha
authors.initials: GH
authors.lastname: Kim
authors.forename: Do Youn
authors.initials: DY
authors.lastname: Park
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Kida
authors.forename: Dae Hwan
authors.initials: DH
authors.lastname: Kim
authors.forename: Tae Yong
authors.initials: TY
authors.lastname: Jeon
authors.forename: Hyun Jeong
authors.initials: HJ
authors.lastname: Kang
authors.forename: Dong Uk
authors.initials: DU
authors.lastname: Kim
authors.forename: Cheol Woong
authors.initials: CW
authors.lastname: Choi
authors.forename: Bong Eun
authors.initials: BE
authors.lastname: Lee
authors.forename: Jeong
authors.initials: J
authors.lastname: Heo
authors.forename: Geun Am
authors.initials: GA
authors.lastname: Song
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D055088:Early Detection of Cancer; D019160:Endosonography; D005260:Female; D005753:Gastric Mucosa / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology*