Targeted Next-generation Sequencing for Reliable Detection of Genetic Status in Breast Cancer | [Journal of College of Physicians and Surgeons--Pakistan : JCPSP • 2021]

Author(s):

1. Hassan Tariq: Department of Histopathology, Armed Forces Institute,Rawalpindi,Pakistan

2. Asma Gul: Department of Histopathology, Armed Forces Institute,Rawalpindi,Pakistan

3. Muhammad Zubair: Department of Histopathology, Armed Forces Institute,Rawalpindi,Pakistan

4. Syed Raza Ja er: Department of Pathology, Armed Forces Institute,Rawalpindi,Pakistan

5. Nadeem Zafar: Department of Histopathology, Armed Forces Institute,Rawalpindi,Pakistan

6. Ghazala Sadaf: Department of Histopathology, Armed Forces Institute,Rawalpindi,Pakistan

Abstract:

Objective: To test the germline oncogenic mutations in BRCA1 and BRCA2 genes, associated with triple-negative breast cancer (TNBC) patients under study, by targeted sequencing of their DNA with next-generation sequencing (NGS) platform. Study Design: Cross-sectional observational study. Place and Duration of Study: Histopathology Department, Armed Forces Institute of Pathology (AFIP) Rawalpindi, Pakistan from May to June 2020. Methodology: Peripheral blood of 14 women (aged d60) with triple negative breast carcinoma (TNBC) was taken with the consent of performing germline genetic testing.Targeted NGS was performed for allcoding regions and splicing sites of BRCA1 and BRCA2 genes, using AmpliSeq for Illumina BRCA Panel and Illumina MiSeq sequencer (placed at AFIP). Analysis and interpretation of the sequencing results have been done by using Illumina bioinformatics tools and external databases. Results: Two hundred and fty-four variants were detected in BRCA1 and BRCA2 genes, having variant quality score of 100 in all cases under study. As a result, two pathogenic variants and three variants of uncertain signi cance were interpreted in this germline pipeline. Cases with pathogenic variants had early onset breast cancer with age less than 35. Conclusion: Germline variants in BRCA were detected in the known cases of TNBC, which will not only identify the most prevalent mutations in this region; but will also make them a candidate to receive targeted therapies, which was previously not possible without genetic testing. Moreover, this study further validates the importance of early BRCA genetic screening in young patients, who have positive family history of breast carcinoma.

Page(s): 837-840

DOI: 10.29271/jcpsp.2021.07.837

Published: Journal: Journal of College of Physicians and Surgeons--Pakistan : JCPSP, Volume: 31, Issue: 07, Year: 2021

Keywords:

Nextgeneration sequencing , Breast Cancer , BRCA2 , Triple Negative , BRCA1

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