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Context: The context of this study was epidemiology pediatric thyroid cancer in Bandung, Indonesia. Aims: The aim of this study is to evaluate clinical characteristics and outcome between children and young adult patients with differentiated thyroid cancer (DTC) treated in our hospital. Settings and Design: This was a cohort retrospective study. Materials and Methods: The medical records of 144 patients with DTC who underwent thyroid surgery followed by radioiodine and thyroid hormone suppression were retrospectively reviewed. Thyroid cancers were diagnosed between January 2007 and December 2010. Participants consisted of 43 patients who were younger than 21 years old and 101 young adult patients (older than 21 years old but younger or equal to 40 years). The clinical characteristics and outcomes were analyzed and compared, and then, recurrence-free survival was evaluated using Kaplan-Meier methods. Statistical Analysis Used: Software R 3.3.0 version for Windows was used in this study. Results: Female has higher tendency to have thyroid cancer than male (P = 0.006). Based on histopathology report, classic papillary thyroid cancer is the most common cancer type in children than young adult. However, there was no significant difference between two groups regarding thyroid cancer size and multifocality (P = 0.815 and P = 0.370). The risk of recurrent ratio of children to young adults is 3.88 (95% confidence interval [CI] 1.38; 10.91). A similar result trend has been shown for sex type, histopathology type, number of nodules, surgical technique, and metastasis parameters (adjusted hazard ratio = 7.91, 95% CI 2.11; 29.67). Conclusions: DTC in children shows more aggressive behavior compared to young adult patients. [ABSTRACT FROM AUTHOR]