Endocrinol Metab.  2018 Mar;33(1):62-69. 10.3803/EnM.2018.33.1.62.

Comparison of Immunohistochemistry and Direct Sanger Sequencing for Detection of the BRAF(V600E) Mutation in Thyroid Neoplasm

Affiliations
  • 1Division of Endocrinology and Metabolism, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. wongukim@amc.seoul.kr
  • 2Division of Endocrinology and Metabolism, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 3Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. hipuha@hanmail.net

Abstract

BACKGROUND
The BRAF V600E mutation is the most common genetic alteration identified in papillary thyroid carcinoma (PTC). Because of its costs effectiveness and sensitivity, direct Sanger sequencing has several limitations. The aim of this study was to evaluate the efficiency of immunohistochemistry (IHC) as an alternative method to detect the BRAF V600E mutation in preoperative and postoperative tissue samples.
METHODS
We evaluated 71 patients who underwent thyroid surgery with the result of direct sequencing of the BRAF V600E mutation. IHC staining of the BRAF V600E mutation was performed in 49 preoperative and 23 postoperative thyroid specimens.
RESULTS
Sixty-two patients (87.3%) had PTC, and of these, BRAF V600E was confirmed by direct sequencing in 57 patients (91.9%). In 23 postoperative tissue samples, the BRAF V600E mutation was detected in 16 samples (70%) by direct sequencing and 18 samples (78%) by IHC. In 24 fine needle aspiration (FNA) samples, BRAF V600E was detected in 18 samples (75%) by direct sequencing and 16 samples (67%) by IHC. In 25 core needle biopsy (CNB) samples, the BRAF V600E mutation was detected in 15 samples (60%) by direct sequencing and 16 samples (64%) by IHC. The sensitivity and specificity of IHC for detecting the BRAF V600E mutation were 77.8% and 66.7% in FNA samples and 99.3% and 80.0% in CNB samples.
CONCLUSION
IHC could be an alternative method to direct Sanger sequencing for BRAF V600E mutation detection both in postoperative and preoperative samples. However, application of IHC to detect the BRAF V600E mutation in FNA samples is of limited value compared with direct sequencing.

Keyword

Immunohistochemistry; Sanger sequencing; BRAF; Mutation; Thyroid neoplasms

MeSH Terms

Biopsy, Fine-Needle
Biopsy, Large-Core Needle
Humans
Immunohistochemistry*
Methods
Sensitivity and Specificity
Thyroid Gland*
Thyroid Neoplasms*

Figure

  • Fig. 1 Detection of the BRAFV600E mutation in different thyroid tissue specimens with inconsistent results between direct Sanger sequencing and immunohistochemistry (IHC) (A–F). Two postoperative thyroidectomy specimens were positive by immunohistochemistry for the BRAFV600E mutation (A, B, ×400), but negative by direct Sanger sequencing. Two preoperative fine needle aspiration cell block specimens showed discrepant results with positive direct Sanger sequencing (C, D) results and negative IHC results (E, F, ×400). Two preoperative core needle biopsy specimens were positive by IHC for the BRAFV600E mutation (G, H, ×400), but negative by direct Sanger sequencing.


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