Prognostic value of pre-ablation stimulated thyroglobulin in children and adolescents with differentiated thyroid cancer.
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AIM: To investigate the prognostic value of pre-ablation stimulated thyroglobulin (ps-Tg) in children and adolescents with persistent differentiated thyroid cancer (DTC) following initial radioiodine therapy (RAI). MATERIALS & METHODS: Patients were classified into "no clinical evidence of disease" (NED), "biochemical persistent disease" (BPD), and "structural/functional persistent disease" (S/FPD) groups, based on their therapeutic response to initial RAI. BPD patients were further categorized as incomplete response (IR) or Non-IR; S/FPD patients were categorized as remission or Non-remission. Receiver operating characteristic (ROC) curves were used to assess the predictive value of ps-Tg for long-term prognosis. Univariate and multivariate regression analyses were performed to identify risk factors for IR in BPD group and Non-remission in S/FPD group. RESULTS: In total, 130 patients were included, with NED (32), BPD (61), and S/FPD (37) patients. Multivariate analysis identified therapeutic response to initial RAI as the only independent predictor of IR in the BPD group. ROC analysis determined an optimal ps-Tg threshold of 112.40 ng/mL for predicting Non-remission in S/FPD patients. Multivariate analysis further confirmed that ps-Tg > 112.4 ng/mL was significantly associated with Non-remission. CONCLUSIONS: Findings indicate ps-Tg as a valuable predictor of long-term prognosis in children and adolescents with persistent DTC post initial RAI.