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Automated PCR detection of BRAF mutations in colorectal adenocarcinoma: a diagnostic test accuracy study
  1. Richard Colling1,
  2. Lai Mun Wang1,
  3. Elizabeth Soilleux1,2
  1. 1Department of Cellular Pathology, Oxford University Hospitals NHS Trust, Oxford, UK
  2. 2Nuffield Division of Clinical Laboratory Sciences, University of Oxford, Oxford, UK
  1. Correspondence to Dr Richard Colling, Department of Cellular Pathology, Oxford University Hospitals NHS Trust, Level 1, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK; rtcolling{at}gmail.com

Abstract

Background Testing for BRAF mutations in colorectal carcinoma (CRC) is important in the screening pathway for Lynch syndrome and is of prognostic value to guide management. This is a diagnostic accuracy study of the Idylla system, a novel and automated alternative PCR system.

Methods 100 consecutive formalin-fixed, paraffin-embedded CRC resection cases were tested for BRAF mutations using the Idylla automated platform and compared with standard (Cobas) PCR.

Results The sensitivity of the Idylla BRAF test was 100% and the specificity was 96%. Only one discordant Idylla positive/standard PCR negative result occurred and on Droplet Digital PCR demonstrated a mutation not identified by traditional PCR in this case.

Conclusion This study has validated the Idylla system for BRAF testing in CRC and demonstrated a possibly greater sensitivity, in addition to cost effectiveness and shorter turnaround time, when compared with standard PCR.

  • COLORECTAL CANCER
  • diagnostic screening
  • SURGICAL PATHOLOGY

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