Relationship between BRAF V600E and some aggressive features in papillary thyroid carcinoma ≤1.5 cm

Objectives: Determine the association between BRAF V600E mutation in papillary thyroid microcarcinoma (PTMC), small papillary thyroid carcinoma (PTC 1-1.5 cm), with tumour-aggressive characteristics. Subjects and methods: Retrospective descriptive study of 104 patients with PTMC diagnosed by histopathology and with BRAF V600E gene mutation testing results. Study subjects were divided into 2 groups: PTMC (tumour size ≤1.0 cm) and PTC 1-1.5 cm (tumour size 1-1.5 cm) and evaluated aggressive features (macroscopic extrathyroidal invasion, lymph node metastasis, high-risk variants). Results: BRAF V600E gene mutation was detected in 72.8% of PTMC and 76.5% of PTC 1-1.5 cm. The proportion of tumours with aggressive features in PTMC with and without mutations was 66.7 and 52.63%, respectively (p=0.28). The proportion of tumours with aggressive features in PTC 1-1.5 cm with and without mutations was 80.7 and 100%, respectively (p=0.309). In the PTMC group, the rate of extrathyroidal invasion was higher in tumours with BRAF V600E mutation (p<0.05). No association was found between BRAF V600E gene mutation and lymph node metastasis, high cell variation, and more than one aggressive feature in both PTMC and PTC 1-1.5 cm patient groups. Conclusions: In the PTMC group, the rate of extrathyroidal invasion was higher in patients with the BRAFV600E mutation. No association was found between BRAFV600E gene mutation and other aggressive features in patients with PTMC and PTC 1-1.5 cm.