title: Detection of telomerase activity in esophageal squamous cell carcinoma and normal esophageal epithelium.
abstract: OBJECTIVE
  Relatively little has been reported about the telomerase activity of esophageal squamous cell carcinoma or normal esophageal epithelium. In this study, we have evaluated whether telomerase activity is a useful marker for detecting malignancies in the esophagus.
  
  
  METHODS
  Esophageal carcinomas and normal esophageal tissues adjacent to carcinomas were obtained from 52 surgically treated, unselected patients, and normal esophageal epithelium from 11 non-cancerous patients were obtained by means of biopsy. The telomeric repeat amplification protocol (TRAP) assay was used for detection of telomerase activity in these samples. The incidence of detection of telomerase activity in esophageal carcinoma was compared with that of telomerase activity in normal esophageal epithelium. Moreover, the clinicopathological characteristics of telomerase-positive tumors were compared with those of telomerase-negative tumors.
  
  
  RESULTS
  Of the 52 carcinomas, 40 (77%) had detectable telomerase activity. However, telomerase activity was detected in 45 of 52 (87%) normal tissue samples adjacent to carcinomas and in 8 of 11 (73%) normal esophageal epithelium from non-cancerous patients. In esophageal cancer, no significant difference was detected in the clinicopathological findings between the telomerase-positive and -negative cases.
  
  
  CONCLUSIONS
  These results indicate that not only esophageal squamous cell carcinomas but also normal esophageal epithelium show strong telomerase activity. Thus, telomerase activity may not be a good marker for the detection of carcinoma in the esophagus.
authors.affiliation: Department of Surgery I, Faculty of Medicine, Tottori University, Yonago, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ikeguchi
authors.forename: H
authors.initials: H
authors.lastname: Unate
authors.forename: M
authors.initials: M
authors.lastname: Maeta
authors.forename: N
authors.initials: N
authors.lastname: Kaibara
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000201:enzymology; D004848:Epithelium / Q000201:enzymology; D004938:Esophageal Neoplasms / Q000175:diagnosis* / Q000201:enzymology; D004947:Esophagus / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D019098:Telomerase / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D019098:Telomerase