Prevalence and Clinical Impact of BRAF p.V600E Mutation in Papillary Thyroid Carcinoma.

Abstract

Identifying risk factors in papillary thyroid carcinoma (PTC) that warrant more aggressive treatment is paramount. Importantly, the prevalence and clinical significance of BRAF p.V600E mutation in PTC remain debatable. This study aims to determine the association of BRAF p.V600E with demographic and clinicopathologic characteristics, including recurrence. Single institution data from consecutive PTC patients with BRAF p.V600E immunohistochemistry and/or molecular testing was collected between 2018 and 2022, including BRAF status, morphologic subtype, TN category, tumor size, nodal disease burden, tumor multifocality, extrathyroidal extension, treatment, follow-up time, loco-regional and distant recurrence, and mortality. This study included 301 patients, 30% male. The majority had BRAF p.V600E mutation (78.7%), and BRAF p.V600E was associated with morphologic subtype (p < 0.001), with 88% of classic subtype PTCs, 38% of PTCs with extensive follicular growth, and 100% of tall cell subtype expressing BRAF p.V600E. BRAF p.V600E was not associated with tumor size (p = 0.696) or nodal disease burden (p = 0.962). On multivariate analysis using Cox proportional hazard model, large volume nodal disease burden (HR 3.37, 95%CI 1.49-7.64, p = 0.004) and male gender (HR 2.29, 95%CI 1.23-4.26, p = 0.009) were significantly associated with recurrence. BRAF p.V600E (HR 0.71, 95% CI 0.31-1.65, p = 0.4) was not significantly associated with recurrence. In conclusion, presence of BRAF p.V600E in the absence of high risk histologic features does not have an impact on PTC recurrence, and thus, its utility in risk stratification is questionable in the setting of other clinicopathologic risk factors.