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Estimation the Maximum Tolerance Activity of Blood by a Simple Algorithm Method in Pediatric Differentiated Thyroid
Yu-Wen Chen1, Cheng-Hsun Chuang2,3, Che-Wei Wu2,4
1Department of Nuclear Medicine, Kaohsiung Medical University Hospital, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
Radioactive iodine (RAI) dosing for pediatric differentiated thyroid cancer (DTC) can be safely guided by risk stratification. This approach, based on the "as high as safe administration" (AHASA) principle, ensures effective treatment while minimizing risks.
Area of Science:
- Pediatric Oncology
- Nuclear Medicine
- Endocrinology
Background:
- Pediatric differentiated thyroid cancer (DTC) requires radioactive iodine (RAI) treatment post-thyroidectomy.
- Accurate RAI dosing is crucial but challenging in pediatric patients.
- The "as high as safe administration" (AHASA) principle aims to optimize RAI therapy.
Purpose of the Study:
- To evaluate the AHASA principle for empirical RAI dosing in pediatric DTC.
- To assess RAI dosimetry using maximum tolerance activity (MTA) and a simple algorithm.
- To determine the safety and efficacy of risk-stratified RAI dosing.
Main Methods:
- Twenty pediatric DTC patients received empirical RAI dosing based on risk stratification.
- Maximum tolerance activity (MTA) in blood was estimated using the modified Hänscheid equation.
- Patient data including tumor size, lymph node metastasis, and prior RAI treatments were analyzed.
Main Results:
- Empirical RAI dosing according to AHASA was safe, with no severe adverse effects.
- Body weight-based dosing showed variability, and the Dutch recommended dose resulted in underdosing.
- Lower body weight correlated with higher blood absorption dose (R² = 0.3849, p = 0.014).
Conclusions:
- Empirical RAI dosing based on risk stratification is a safe and effective method for pediatric DTC.
- The AHASA principle provides a reliable framework for RAI treatment.
- For prepubertal patients with low body weight, MTA calculation is recommended for RAI dose adjustment.
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