title: Telomerase activity in fine needle aspiration biopsy samples: application to diagnosis of human thyroid carcinoma.
abstract: BACKGROUND
  The diagnosis of thyroid follicular carcinoma by fine needle aspiration biopsy is a well known problem in thyroid pathology.
  
  
  METHODS
  We evaluated telomerase activity (TA) in 85 fine needle aspiration biopsy (FNAB) samples from patients with thyroid nodules. Surgery samples from patients with tumor or follicular adenomas were also analyzed.
  
  
  RESULTS
  Twenty of the FNAB samples corresponded to carcinomas and were positive to telomerase assay (TA >10 Units). Among them, 4 follicular carcinomas and 1 papillary carcinoma were labeled as indeterminate by FNAB cytological examination. Four percent false positive cases and no false negative cases for TA in FNABs were reported. FNAB samples from follicular adenomas were diagnosed as indeterminate by cytological examination, but they showed no detectable TA. Tumor tissues from patients with follicular or papillary thyroid carcinomas presented TA >10 Units, whereas follicular adenoma tissues (benign nodules) showed no TA.
  
  
  CONCLUSIONS
  Our results showed a good correlation between TA in FNAB samples and tumor/nodule thyroid tissue. This suggested that use of TA as a biological marker of malignancy might be a useful tool in the diagnosis of follicular thyroid carcinomas or follicular thyroid adenomas using FNAB samples.
authors.affiliation: Endocrinology Unit, Hospital Israelita EZRAH, Buenos Aires, Argentina. liliana@qb.fcen.uba.ar
authors.forename: L N
authors.initials: LN
authors.lastname: Guerra
authors.forename: E A
authors.initials: EA
authors.lastname: Miler
authors.forename: S
authors.initials: S
authors.lastname: Moiguer
authors.forename: M
authors.initials: M
authors.lastname: Karner
authors.forename: A M
authors.initials: AM
authors.lastname: Orlandi
authors.forename: H
authors.initials: H
authors.lastname: Fideleff
authors.forename: J A
authors.initials: JA
authors.lastname: Burdman
mesh_terms: D014408:Biomarkers, Tumor; D044963:Biopsy, Fine-Needle / Q000379:methods*; D006801:Humans; D019098:Telomerase / Q000378:metabolism*; D013964:Thyroid Neoplasms / Q000175:diagnosis* / Q000201:enzymology*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D016159:Tumor Suppressor Protein p53; D019098:Telomerase