The Association Between Radioiodine Refractory in Papillary Thyroid Carcinoma, Sodium/Iodide Symporter Expression, and BRAF(V600E) Mutation

OBJECTIVE: To study the association between radioiodine refractory papillary thyroid carcinoma, sodium/iodide symporter (NIS) expression, and the BRAF(V600E) mutation. METHODS: A study was conducted on 30 radioiodine refractory papillary thyroid carcinoma patients and 30 radioiodine-avid papillary thyroid carcinoma patients. The expressions of sodium/iodide symporter and BRAF(V600E) mutated protein were determined by immunohistochemistry using formalin-fixed, paraffin-embedded tissue. RESULTS: The mutated BRAF(V600E) protein was identified in 26 radioiodine refractory papillary thyroid carcinoma subjects (86.7%) and 22 radioiodine-avid papillary thyroid carcinoma subjects (73.3%), with no significant difference between the 2 groups (P = 0.3). Sodium/iodide symporter expression was detected in 4 of 30 cases (13.3%) from the radioiodine-avid papillary thyroid carcinoma group but was negative for all radioiodine refractory cases. There was no association between sodium/iodide symporter expression and radioiodine refractory papillary thyroid carcinoma (P = 0.11). Cases with positive NIS expression were likely negative for BRAF(V600E) mutation (3/4; P = 0.02). CONCLUSION: Papillary thyroid carcinomas with BRAF(V600E) mutation were more likely to be negative for NIS expression. BRAF(V600E) mutation and NIS expressions cannot be used to predict radioiodine sensitivity.