Journal of Clinical and Diagnostic Research, ISSN - 0973 - 709X

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Original article / research
Year : 2017 | Month : March | Volume : 11 | Issue : 3 | Page : EC40 - EC44

Breast Biomarkers-Comparison on Whole Section and Tissue Microarray Section

Sneha S Chavan, Savithri Ravindra, Prasad msn

1. Postgraduate Student, Department of Pathology, Kempegowda Institute of Medical Sciences, Bengaluru, Karnataka, India. 2. Associate Professor, Department of Pathology, Kempegowda Institute of Medical Sciences, Bengaluru, Karnataka, India. 3. Consultant Pathologist, Department of Pathology, Sri Shankara Cancer Hospital and Research Centre, Bengaluru, Karnataka, India.

Correspondence Address :
Dr. Sneha S Chavan,
796, 19th Main 19th Cross Banashankari 2nd Stage, Benguluru-560070, Karnataka, India.
E-mail: drsnehaschavan@gmail.com

Abstract

Introduction: Estrogen Receptor (ER), Progesterone Receptor (PR) and Her2/neu are routinely studied markers for breast carcinoma. Analysis of these biomarkers is traditionally done by Immunohistochemistry (IHC) on whole sections. These markers can also be studied on Tissue Microarray (TMA) sections. Tissue microarray is a technique where core samples from different paraffin blocks are arrayed on a single recipient block which can then be cut to yield a single section with multiple cores in it.

Aim: To compare ER, PR and Her2/neu on TMA sections with whole sections and to determine the concordance of results between the two methods.

Materials and Methods: A TMA block was constructed by punching out 2 mm cores from appropriately marked paraffin blocks of 53 breast carcinoma cases and embedding them in the recipient block. Immunostaining of TMA sections and whole sections were performed for ER, PR and Her2/neu and the results were compared. Statistical analysis was done using chi square test/Fisher-Exact test. Kappa co-efficient, Jaccard Index and G-Index were computed.

Results: Infiltrating Ductal Carcinoma-No Special Type (IDC-NST) was the predominant type of carcinoma and most of the tumours were of Grade II and III. Majority, 38/53 (71.7%) were ER/PR positive and Her2 negative and 9/53 (17%) cases were triple negative. Good concordance between whole sections and TMA sections were noted with kappa value for ER, PR and Her2/neu being 0.671, 0.754, 1.000 respectively which was statistically significant.

Conclusion: Immunostaining for ER, PR and Her2/neu done on TMA section using single 2 mm core were comparable with conventional whole section scores. Thus, TMA is a reliable method for evaluating these biomarkers with the advantage of being time and cost effective.

Keywords

Breast carcinoma, Estrogen receptor, Her2/Neu

How to cite this article :

Sneha S Chavan, Savithri Ravindra, Prasad msn. BREAST BIOMARKERS-COMPARISON ON WHOLE SECTION AND TISSUE MICROARRAY SECTION. Journal of Clinical and Diagnostic Research [serial online] 2017 March [cited: 2017 Mar 28 ]; 11:EC40-EC44. Available from
http://www.jcdr.net/back_issues.asp?issn=0973-709x&year=2017&month=March&volume=11&issue=3&page=EC40-EC44&id=9573

DOI and Others

DOI: 10.7860/JCDR/2017/25088.9573


Date of Submission: Nov 02, 2016
Date of Peer Review: Nov 16, 2016
Date of Acceptance: Dec 23, 2016
Date of Publishing: Mar 01, 2017

Financial OR OTHER COMPETING INTERESTS: None.

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