en Cancer Biology Cancer Biology مقاله کامل Full Length/Original Article <strong>Background:</strong> Previous data have shown the tumorigenicity roles of histone deacetylase 8 (HDAC 8) in breast cancer. More recently, the oncogenic effects of this molecule have been revealed in triple negative breast cancer (TNBC). The present study aimed to determine the diagnostic value of HDAC8 for the differentiation of TNBC from nTNBC tumors. <strong>Methods:</strong> A total of 50 cancerous and normal adjacent tumor specimens were obtained, and the clinical and pathological findings of studied subjects were recorded. The expression of <em>HDAC8</em> gene was determined by qRT-PCR. Also, immunohistochemical staining was performed on tissue samples. <strong>Results:</strong> Our results showed that the expression of<em> HDAC8</em> in breast cancer tissues was significantly higher than the normal adjacent tissues (<em>p</em> = 0.0011). <em>HDAC8</em> expression was also observed to be higher in TNBC patients than nTNBC group (<em>p</em> = 0.0013). In addition, in the TNBC group, there was a significant association between the <em>HDAC8</em> overexpression and tumor characteristics, including tumor size (<em>p</em> = 0.039), lymphatic invasion (<em>p</em> = 0.01), tumor grade (<em>p</em> = 0.02), and perineural invasion (<em>p</em> < 0.05). The cut-off value was fixed at 0.6279 r.u., and the corresponding sensitivity and specificity were found to be 73.91% and 70.37%, respectively. <strong>Conclusion:</strong> According to the findings, among the other markers, HDAC8 oncogene may be used as a potential tumor marker in the diagnosis of TNBC tumors. Breast cancer, HDAC8, Triple negative breast cancer 288 294 http://ibj.pasteur.ac.ir/browse.php?a_code=A-10-1-826&slc_lang=en&sid=1 Mohammad-Nazir Menbari No Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran Karim Rahimi No Department of Molecular Biology and Genetics, Gene Expression and Gene Medicine, Aarhus University, Aarhus, Denmark Abbas Ahmadi 0000-0002-1643-3500 No Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran Samira Mohammadi-Yeganeh 0000-0003-0430-6325 No Medical Nanotechnology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran Anvar Elyasi 0000-0003-4434-6604 No Department of Surgery, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran Nikoo Darvishi No Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran Vahedeh Hosseini No Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran Mohammad Abdi 0000-0002-4766-0423 Yes Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran