title: Evaluating the expression of oct4 as a prognostic tumor marker in bladder cancer.
abstract: OBJECTIVE
  The key transcriptional regulator Oct4 is one of the self-renewal and differentiation-related factors in cancer stem cells, where it maintains "stemness" state. Cancer stem cells have been identified in a variety of solid malignancies. They are a small population of tumor cells with stem cell characteristics, which are a likely cause of relapse in cancer patients. Due to high incidence, mortality, and recurrence rates of bladder cancer and the necessity of accurate prediction of malignant behavior of the tumors, we evaluated the prognostic value of Oct4 expression in formalin-fixed paraffin-embedded (FFPE) tissues of bladder cancer.
  
  
  METHODS
  In this study, Oct4 expression was evaluated in 52 (FFPE) tissues of bladder cancer. RNA extraction from samples of 30 patients from the archive of Labbafi-Nejad Medical Centre in Tehran was performed and Oct4 expression levels were examined by semi-quantitative RT-PCR. The intracellular distribution of Oct4 protein was also determined by immunohistochemistry (IHC).
  
  
  RESULTS
  The results revealed a significant correlation between the expression level of Oct4 and the tumors' grade and stage. A mostly cytoplasmic distribution of Oct4 protein was also confirmed by IHC.
  
  
  CONCLUSIONS
  All together, our data indicate that the expression level of Oct4 gene is correlated with the clinical and histopathological prognostic indexes of tumors and thus can be considered as a potential prognostic tumor marker.
authors: Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran ; Department of Pathology, Labbafi-Nejad Medical Centre, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Nasim
authors: N
authors: Hatefi
authors: Nazila
authors: N
authors: Nouraee
authors: Mahmoud
authors: M
authors: Parvin
authors: Seyed-Amir Mohsen
authors: SA
authors: Ziaee
authors: Seyed Javad
authors: SJ
authors: Mowla
keywords: Bladder cancer; Cancer Stem cell; Oct4; Prognosis
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