Autoimmune thyroiditis in paediatric thyroid cancer: clinical features and outcomes

Area of Science:

• Endocrinology
• Paediatric Oncology
• Thyroid Cancer Research

Background:

• Autoimmune thyroiditis (AIT) is an immune-mediated condition affecting the thyroid gland.
• Paediatric differentiated thyroid carcinoma (paedDTC) is a rare malignancy in children.
• The interplay between AIT and paedDTC requires further elucidation.

Purpose of the Study:

• To investigate the clinical characteristics of paediatric differentiated thyroid carcinoma (paedDTC).
• To evaluate survival outcomes in paedDTC patients with and without autoimmune thyroiditis (AIT).

Main Methods:

• Retrospective cohort analysis of 401 paediatric patients (<18 years) with histopathologically confirmed DTC.
• Patients were stratified based on the presence or absence of AIT.
• Survival outcomes were assessed using Kaplan-Meier estimates.

Main Results:

• 16.0% of paedDTC patients had AIT, diagnosed at a significantly older age.
• AIT patients exhibited significantly lower rates of distant metastasis (7.5% vs. 22.2%).
• A trend towards improved event-free survival was noted in AIT patients, with comparable overall survival.

Conclusions:

• Autoimmune thyroiditis is present in 16% of paediatric DTC cases and is associated with reduced distant metastasis.
• AIT may be linked to improved event-free survival and similar overall survival in paediatric thyroid cancer.
• Earlier detection of paedDTC through surveillance in AIT patients warrants further investigation into underlying mechanisms.