The genetic duet of BRAF V600E and TERT promoter mutations predicts the poor curative effect of radioiodine therapy in papillary thyroid cancer.

Objective: The BRAF V600E and TERT promoter mutations are well known to be associated with poor clinical outcomes of papillary thyroid cancer (PTC). Radioactive iodide (RAI)-refractory can be evaluated in advance of treatment, for which predictive biomarkers may be helpful. The present study is to analyze the correlation of both mutations with the curative effect of radioiodine therapy. Methods: A total of 126 patients who underwent RAI therapy from October 2016 to August 2019 were recruited. Treatment and follow-up were defined according to criteria used in the 2015 ATA guidelines. The RAI response of patients was assessed as excellent response (ER) and RAI-refractory at the end of follow-up. Results: When dividing the 126 patients into 4 groups, the no mutation, only BRAF V600E mutation, only TERT promoter mutation, and coexistence of two mutation groups were found in 15.8%, 68.3%, 2.4%, and 13.5% patients. RAI-refractory was found in 52.9% (9/17) patients with the coexisting BRAF and TERT mutations. In logistic regression analysis, M1, BRAF, and TERT mutation were confirmed to be independent factors predicting the RAI-refractory. Moreover, 35.3%, 41.2%, and 23.5% of patients in the BRAF and TERT mutation group were assessed as ER, SIR, and BIR respectively. Kaplan–Meier analyses revealed that the genetic duet of BRAF V600E and TERT promoter mutations was associated with a lower ER reached time. Conclusions: We found that BRAF V600E and TERT promoter mutation is significantly correlated with the poor curative effect of RAI therapy in PTC. Trial registration: ClinicalTrials.gov Identifier: ChiCTR1800018760. [ABSTRACT FROM AUTHOR]