title: Effects of EGFR, CK19, CK20 and Survinin gene expression on radiotherapy results in patients with locally advanced head and neck cancer.
abstract: OBJECTIVE
  To investigate the effects of epidermal growth factor receptor (EGFR), cytokeratin 19 (CK19), cytokeratin 20 (CK20) and survinin gene expression on local control (LC) and overall survival (OS) in patients with locally advanced head and neck cancer (LAHNC) who were administered radiotherapy (RT).
  
  
  METHODS
  Twenty-six patients who were admitted to Uludag University Medical Faculty Department of Radiation Oncology with a diagnosis of LAHNC (GIII-GIV) were included in this study. Gene expression was evaluated in tumor tissues and peripheral blood. RNA isolation was performed on paraffinized tumor tissues and peripheral blood samples obtained before RT (BR). The densities of the obtained RNAs were analyzed at 260/280 nm. cDNA samples obtained from total RNA,EGFR, CK19, CK20 and survinin gene expression levels were assessed via the Sybr Green method and data were analyzed with the ΔΔCt method. The same process was repeated for peripheral blood samples taken after RT (AR).
  
  
  RESULTS
  The female/male ratio was 3:23 and the mean age was 56.5 years (38-75 years). After radiotherapy, CK19 and CK20 levels in the peripheral blood were found to be correlated according to Pearson correlation analysis(p=0.049). This result indicates a possibility of remaining positive for CK19 and CK20 in the peripheral blood even after RT in patients with CK19, CK20, and EGFR positive tumors before RT. There was a statistically significant correlation between survinin levels measured BR and AR (p=0.028).
  
  
  CONCLUSIONS
  In this study, we found that patients with any EGFR, CK19, CK20 or survinin positivity in their peripheral blood obtain less benefit from radiotherapy. A wider patient population and advanced protein analyses are necessary in order to increase the reliability of our findings.
authors: Department of Radiation Oncology, Bursa Ali Osman Sonmez Oncology Hospital, Bursa, Turkey E-mail : onurilyasoglu131202@ahoo.com.
authors: Kezban Esra
authors: KE
authors: Kekilli
authors: Candan Demioz
authors: CD
authors: Abakay
authors: Gulcin
authors: G
authors: Tezcan
authors: Berrin
authors: B
authors: Tunca
authors: Unal
authors: U
authors: Egeli
authors: Ozlem
authors: O
authors: Saraydaroglu
authors: Onur
authors: O
authors: Esbah
authors: Ahmet Siyar
authors: AS
authors: Ekinci
authors: Sonay
authors: S
authors: Arslan
authors: Nuri
authors: N
authors: Uslu
authors: Lutfi
authors: L
authors: Ozkan
mesh_terms: D000328:Adult; D000368:Aged; D066246:ErbB Receptors / Q000235:genetics*; D005260:Female; D015870:Gene Expression / Q000235:genetics*; D006258:Head and Neck Neoplasms / Q000235:genetics* / Q000532:radiotherapy*; D006801:Humans; D053539:Keratin-19 / Q000235:genetics*; D053554:Keratin-20 / Q000235:genetics; D008297:Male; D008875:Middle Aged; D012313:RNA / Q000235:genetics
chemical_list: C507499:KRT20 protein, human; D053539:Keratin-19; D053554:Keratin-20; D012313:RNA; C512478:EGFR protein, human; D066246:ErbB Receptors