Radioiodine treatment in female survivors of pediatric differentiated thyroid carcinoma does not affect future pregnancy rates.

Objective: Patients with pediatric differentiated thyroid carcinoma (DTC) treated with radioiodine (RAI) therapy may experience long-term side effects, such as gonadal dysfunction. Therefore, it is crucial to understand the impact of this therapy on ovarian reserve and future pregnancy rates. Subjects and methods: Retrospective analysis of 64 female DTC survivors of childbearing age to assess the risk of infertility due to RAI performed before the age of 19 years. Results: Thirty-two out of the 64 DTC survivors had a history of at least one pregnancy during follow-up. No significant differences were observed between the cumulative RAI activity, treatment regimens (multiple versus single RAI treatment), age at first treatment, or presence of lymph node or distant metastases. Notably, the group without a history of pregnancy had a younger age at the time of diagnosis and larger tumors. Age at first pregnancy was slightly higher than that in the general population, but no increase in negative maternal or fetal outcomes was observed. Conclusions: The results of this study show little observational evidence suggesting important adverse effects of RAI on fertility or pregnancy outcomes among female survivors of childhood DTC. Still, studies including larger populations are warranted.