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Outcomes of Children and Adolescents with Well-Differentiated Thyroid Carcinoma and Pulmonary Metastases Following I-131 Treatment: A Systematic Review

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THYROID
卷 20, 期 10, 页码 1095-1101

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MARY ANN LIEBERT INC
DOI: 10.1089/thy.2009.0446

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Background: The optimal dose and efficacy of I-131 treatment of children and adolescents with well-differentiated thyroid carcinoma (WDTC) and pulmonary metastases are not well established. A therapeutic challenge is to achieve the maximum benefit of I-131 to decrease disease-related morbidity and obtain disease-free survival while avoiding the potential complications of I-131 therapy. Summary: We systematically reviewed the published literature on children and adolescents with WDTC and pulmonary metastases treated with I-131 to examine outcomes after I-131 administration and the risks and benefits of therapy. After reviewing 14 published articles, 9 articles met our inclusion criteria encompassing 112 pediatric and adolescent patients with WDTC and pulmonary metastases 21 years of age or younger at diagnosis spanning a follow-up period of 0.6-45 years. I-131 therapy after surgery and thyrotropin suppression resulted in complete, partial, and no disease response in 47.32%, 38.39%, and 14.29% of patients, respectively. Five studies provided data on disease response in relation to I-131 dose. In general, nonresponders received the highest I-131 doses and complete responders received a higher dose than partial responders. The disease-specific mortality rate was 2.68%. Survival was 97.32%. A second primary malignancy occurred in one patient. One out of 11 patients studied experienced radiation fibrosis. Conclusions: This review confirms that the majority of pediatric and adolescent patients with WDTC and pulmonary metastases treated with I-131 do not achieve complete response to therapy, yet disease-specific morbidity and mortality appear to remain low. It is therefore prudent to use caution in the repeated administration of I-131 to such patients to ensure that adverse effects of therapy do not cause more harm than good in a disease that has an overall favorable natural course. Long-term prospective studies are needed to analyze disease-specific morbidity and mortality, recurrence rate, dose-specific response, and dose-related adverse effects of I-131 in this patient population.

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