Аннотация
Papillary thyroid carcinoma (PTC) is the most prevalent histological subtype of thyroid cancer. However, it remains unclear whether BRAF V600E, TERT promoter (TERT-p), and certain pathological markers, such as loss of polarity/loss of cell cohesiveness (LOP/LCC), tall cells, mitotic count, and Ki-67 labeling index (LI) in recurrent tumors, are associated with clinical outcomes in patients with PTC after reoperation for recurrent PTC. This study investigates the impact of BRAF V600E and TERT-p mutations on progression-free survival (PFS) after reoperation for recurrent PTC. Cox regression analysis was employed to identify parameters associated with PFS. During a mean follow-up period of 27 months after reoperation, 39 patients (21.3%) experienced disease progression. Coexistence of BRAF V600E and TERT-p mutations (double mutation: Dmut) was observed in 21.3% of patients. TERT-p, Dmut, LOP/LCC (≥10%), mitotic count (≥3 per 2 mm2), and Ki-67 LI were found to be significantly associated with disease progression in unadjusted analyses. In a multivariable analysis, these associations remained significant, with hazard ratios and 95% confidence intervals for TERT-p, Dmut, LOP/LCC, mitotic count, and Ki-67 LI being 5.98 (2.31-15.5), 5.44 (2.21-13.3), 6.81 (2.00-23.2), 5.05 (2.07-12.3), and 5.85 (2.48-13.7), respectively. Extranodal extension was associated with disease progression in both unadjusted and multivariable analyses. TERT-p, Dmut, Ki-67 LI, LOP/LCC, mitotic count, and extranodal extension were identified as independent risk factors for poor PFS after reoperation. Close surveillance following reoperation is recommended for patients exhibiting these factors.