Risk Factors for Neck Nodal Metastasis in Papillary Thyroid Cancer With BRAF V600E Mutation.

[BACKGROUND] The BRAF V600E mutation is the most common genetic variant in papillary thyroid cancer (PTC), but the relationship between the BRAF V600E mutation in PTC and cervical lymph node metastasis (LNM) remains controversial.

[OBJECTIVE] To estimate risk factors for neck nodal metastasis in PTC with BRAF V600E mutation.

[PATIENTS] A total of 292 patients diagnosed with BRAF V600E mutation related PTC were admitted.

[DESIGN] In this retrospective study, data from 292 patients, including clinical, molecular, and ultrasonic characteristics, were analyzed. Univariate and multivariate logistic regression analyses were applied to identify risk factors for LNM in PTC with the V600E mutation.

[RESULTS] In the univariate analysis of all PTC patients with the BRAF V600E mutation, the LNM was found to be significantly associated with age ( = 0.010), size ( = 0.000), bilaterality ( = 0.000), multifocality ( = 0.002), LNM in ultrasound (US) ( = 0.000), and capsular invasion ( = 0.010). In ultrasonic image characteristics, margin ( = 0.036), shape ( = 0.046), and microcalcification ( = 0.002) were significantly associated with LNM. In multivariate analysis, LNM in PTCs with BRAF V600E mutation was significantly associated with age ≤ 45 years (OR = 1.869, = 0.020, 95% CI = 1.106 - 3.158), size ≥ 1cm (OR = 3.131, = 0.001, 95% CI = 1.578 - 6.212), LNM in US (OR = 6.962, = 0.000, 95% CI = 2.924 - 16.572), bilaterality (OR = 1.626, = 0.007, 95% CI = 1.142 - 2.314), ill-defined margins in US (OR = 1.980, = 0.033, 95% CI = 1.057 - 3.709), and microcalcification in US (OR = 2.786, = 0.002, 95% CI = 1.464 - 5.303).

[CONCLUSION] This study revealed that several significant risk factors for LNM in PTCs with the BRAF V600E mutation included: age ≤ 45 years, size ≥ 1cm, LNM in US, bilaterality, ill-defined margins in US, and microcalcification in US.