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BRAFV600E Mutation is Associated with Decreased Disease-Free Survival in Papillary Thyroid Cancer

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Abstract

Background

The BRAF V600E mutation is a recognised molecular marker in papillary thyroid cancer (PTC), reported incidence from 30 to 80 %. BRAFV600E aberrantly activates the MAPK pathway, a central regulator of cell growth and proliferation. Previous studies have reported conflicting data regarding the impact of BRAFV600E on clinicopathological features of PTC. The study aims to determine whether BRAFV600E is useful as a prognostic biomarker in PTC.

Methods

A cohort study of patients undergoing surgery for PTC was undertaken. The primary outcome measure was disease-free survival. Secondary outcome measures were tumour size, nodal positivity and radioactive iodine ablation rate. All cases were re-examined to confirm PTC. Immunohistochemistry for BRAFV600E was performed on tissue microarrays. A single endocrine pathologist, blinded to clinicopathological data, interpreted staining.

Results

496 patients with PTC were included, and 309 (62 %) were BRAFV600E positive. Tumour size was similar for BRAFV600E-positive and -negative tumours (21.3 vs. 23.2 mm, p = 0.23). BRAFV600E-positive patients were significantly older at first operation (mean age 45 versus 49 years, p = 0.003). BRAFV600E-positive PTCs had a higher rate of disease recurrence (12.9 vs. 5.6 %, p = 0.004), lymph node metastasis (44 vs. 29.4 %, p = 0.004) and extra-thyroidal extension (44 vs. 22 %, p < 0.001). Five-year disease-free survival was 89.6 % for BRAFV600E positive and 96.3 % for negative tumours, p < 0.001. There was no difference between groups for vascular invasion or multifocality. The mean follow-up was 57 months for both groups.

Conclusion

BRAFV600E in PTC predicts an increased risk of lymph node metastasis, extra-thyroidal extension and reduced disease-free survival. It is an additional useful prognostic biomarker.

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Authors and Affiliations

  1. Surgical Endocrine Unit, Royal North Shore Hospital, University of Sydney, Level 3, Acute Services Building, Reserve Road, St Leonards, NSW, 2065, Australia

    S. Fraser, C. Go, A. Aniss, S. Sidhu, L. Delbridge & M. Sywak

  2. Department of Endocrinology, Royal North Shore Hospital and Sydney Medical School, University of Sydney, St Leonards, Australia

    D. Learoyd, R. Clifton-Bligh, L. Tacon, V. Tsang & B. Robinson

  3. Department of Anatomical Pathology, Royal North Shore Hospital and Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, University of Sydney, St Leonards, Australia

    A. J. Gill

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  1. S. Fraser
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Correspondence to S. Fraser.

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Fraser, S., Go, C., Aniss, A. et al. BRAFV600E Mutation is Associated with Decreased Disease-Free Survival in Papillary Thyroid Cancer. World J Surg 40, 1618–1624 (2016). https://doi.org/10.1007/s00268-016-3534-x

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  • DOI: https://doi.org/10.1007/s00268-016-3534-x

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