title: [Quantitative assay of telomerase activity in head and neck squamous cell carcinoma].
abstract: OBJECTIVE
  To detect and quantify telomerase activity in tissues from head and neck squamous cell carcinoma (HNSCC), and to explore whether the levels of telomerase activity can be a useful marker for cancer risk assessment in HNSCC.
  
  
  METHODS
  The levels of telomerase activity of 55 fresh specimens obtained from 25 patients with HNSCC were detected by the method of telomeric repeat scintillation radioactive count, including 25 primary tumors, 7 samples of neck metastases and 23 corresponding normal tissues as control. In 7 patients, both primary and metastatic tumors were obtained. The levels of telomerase activity were determined with a liquid scintillation counter. The basic principle of the technique is that a G-rich oligonucleotide strand of telomeric sequence is used as primer, 3H-dTTPs are incorporated into the products while telomerase elongates the primers, and then free 3H-dTTPs are removed by rinsing step, finally radioactive count per minute (cpm) of products is detected, and the levels telomerase activity can be evaluated according to the value (cpm).
  
  
  RESULTS
  1. The levels of telomerase activity (cpm) in tissues with HNSCC were significantly higher than those in the normal tissues (P < 0.05); 2. The levels of telomerase activity in the primary tumors were higher than those of their neck metastases, but the difference was not statistical significance (P > 0.05); 3. The levels of telomerase activity in the neck metastases were remarkably higher than those in the normal tissues (P < 0.05).
  
  
  CONCLUSIONS
  1. Detection of telomerase activity in HNSCCs can be a useful marker for cancer assessment. 2. To quantify telomerase activity may have clinical diagnostic value for HNSCC. 3. The levels of telomerase activity in the metastatic lymph nodes were higher.
authors.affiliation: Department of Otolaryngology, Third Affiliated Hospital of Xinxiang Medical College, Xinxiang 453003.
authors.forename: S Z
authors.initials: SZ
authors.lastname: Zhang
authors.forename: M M
authors.initials: MM
authors.lastname: Dong
authors.forename: X J
authors.initials: XJ
authors.lastname: Teng
authors.forename: T H
authors.initials: TH
authors.lastname: Chen
authors.forename: S
authors.initials: S
authors.lastname: Zhang
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000201:enzymology* / Q000556:secondary; D006258:Head and Neck Neoplasms / Q000201:enzymology* / Q000473:pathology; D006801:Humans; D008207:Lymphatic Metastasis; D019098:Telomerase / Q000378:metabolism*
chemical_list: D019098:Telomerase