|
1
|
Kammerer S, Jahn SW, Winter E, Eidenhammer S, Rezania S, Regitnig P, Pichler M, Schreibmayer W, Bauernhofer T. Critical evaluation of KCNJ3 gene product detection in human breast cancer: mRNA in situ hybridisation is superior to immunohistochemistry. J Clin Pathol 2016; 69:1116-1121. [PMID: 27698251 PMCID: PMC5256407 DOI: 10.1136/jclinpath-2016-203798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/02/2016] [Accepted: 06/09/2016] [Indexed: 11/17/2022]
Abstract
Increased expression levels of KCNJ3 have been correlated with lymph node metastases and poor prognosis in patients with breast cancer, suggesting a prognostic role of KCNJ3. We aimed to establish protocols for the detection of KCNJ3 in formalin-fixed, paraffin-embedded (FFPE) breast cancer tissue. Several antibodies were tested for sensitivity and specificity by western blot, followed by optimisation of the immunohistochemistry (IHC) procedure and establishment of KCNJ3 mRNA in situ hybridisation (ISH). Methods were validated by processing 15 FFPE breast cancer samples for which microarray data were available. Spearman's rank correlation analysis resulted in borderline significant correlation for IHC versus ISH (rS: 0.625; p<0.05) and IHC versus microarray (rS: 0.668; p<0.01), but in significant correlation for ISH versus microarray (rS: 0.861; p<0.001). The ISH method was superior to IHC, regarding robustness, sensitivity and specificity and will aid to further study expression levels of KCNJ3 in both malignant and physiological conditions.
Collapse
Affiliation(s)
- Sarah Kammerer
- Molecular Physiology Group, Institute of Biophysics, Medical University of Graz, Graz, Austria.,Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | | | - Elke Winter
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | | | - Simin Rezania
- Molecular Physiology Group, Institute of Biophysics, Medical University of Graz, Graz, Austria.,Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Peter Regitnig
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Martin Pichler
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Wolfgang Schreibmayer
- Molecular Physiology Group, Institute of Biophysics, Medical University of Graz, Graz, Austria.,Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria
| | - Thomas Bauernhofer
- Research Unit on Ion Channels and Cancer Biology, Medical University of Graz, Graz, Austria.,Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| |
Collapse
|