title: Association between promoter methylation and expression of thyroid hormone receptor beta (THRβ) gene in patients with gastric cancer in an Iranian population.
abstract: OBJECTIVE
  There is evidence that gastric cancer patients suffer from thyroid disorders. However, the relationship between thyroid receptor (TR) expression and gastric cancer remains unknown. The aim of this study was to evaluate the status of promoter methylation and expression of the thyroid hormone receptor beta (THRβ) gene in gastric cancer patients in an Iranian population.
  
  
  METHODS
  Analysis of THRβ promoter methylation was performed on 85 pairs of formalin-fixed, paraffin-embedded (FFPE) tissue samples as cases and controls via methylation-specific polymerase chain reaction (PCR [MSP]). The samples were obtained from tumors and surrounding healthy tissues from resected gastric cancers. The expression assay was also performed with 25 FFPE tissue pairs (tumor and surrounding healthy tissues of the same individual) using real-time PCR.
  
  
  RESULTS
  The results of the present study show that there is a statistically significant difference between tumor and adjacent normal tissues regarding promoter methylation status and THRβ expression (P = 0.04 and P = 0.036, respectively).
  
  
  CONCLUSIONS
  Therefore, promoter methylation of THRβ may be involved in the development of gastric cancer.
authors.affiliation: Department of Biology, University of Sistan and Baluchestan, Zahedan, Iran.
authors.forename: Dor Mohammad
authors.initials: DM
authors.lastname: Kordi Tamandani
authors.forename: Simin
authors.initials: S
authors.lastname: Hemati
authors.forename: Shahrbbanou Karimi
authors.initials: SK
authors.lastname: Davani
authors.forename: Farshid
authors.initials: F
authors.lastname: Arbabi
mesh_terms: D000328:Adult; D005260:Female; D015870:Gene Expression / Q000235:genetics*; D020869:Gene Expression Profiling / Q000379:methods; D006801:Humans; D007492:Iran; D008297:Male; D008745:Methylation; D008875:Middle Aged; D016133:Polymerase Chain Reaction / Q000379:methods; D011401:Promoter Regions, Genetic / Q000235:genetics*; D013274:Stomach Neoplasms / Q000235:genetics*; D037042:Thyroid Hormone Receptors beta / Q000235:genetics*
chemical_list: D037042:Thyroid Hormone Receptors beta
keywords: THRβ; gastric cancer; methylation