Utility ofBRAFmutation detection in fine-needle aspiration biopsy samples read as “suspicious for papillary thyroid carcinoma”

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Abstract

Background.

The purpose of this study was to evaluate the diagnostic utility of BRAF mutation testing on thyroid nodules “suspicious for papillary thyroid carcinoma” (PTC) cytology.

Methods.

A chart review of patients with fine-needle aspiration (FNA) results “suspicious for PTC” with subsequent thyroidectomy was performed. Corresponding archived FNA slides underwent BRAF mutation testing.

Results.

Sixty-six patients with FNA “suspicious for PTC” underwent thyroidectomy. Forty-two (63.6%) had PTC diagnosed on final histopathology, whereas 21 (31.8%) had benign findings. Thirty-five patients (83%) with histologically proven PTC underwent total thyroidectomy, whereas 7 (17%) underwent hemithyroidectomy. BRAF mutation was detected in 17 of 49 samples (34.6%) available for testing and had 45.5% sensitivity, 87.5% specificity, 88.2% positive predictive value (PPV), and 43.8% negative predictive value (NPV) for diagnosing PTC. Two of 4 patients (50%) who underwent hemithyroidectomy with subsequent completion thyroidectomy had mutated BRAF detected.

Conclusion.

BRAF testing is a useful adjunct to improve PPV for patients with “suspicious for PTC” cytology. © 2014 Wiley Periodicals, Inc. Head Neck37: 1788–1793, 2015

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