Thyroid-Specific Genes Expression Uncovered Age-Related Differences in Pediatric Thyroid Carcinomas.

Area of Science:

• Endocrinology
• Oncology
• Molecular Biology

Background:

• Pediatric differentiated thyroid cancer (DTC) often shows better radioiodine (RAI) therapy response and lower mortality than adult DTC.
• Increased sodium-iodide symporter (NIS) expression was hypothesized to explain better RAI response in pediatric DTC.
• Significant heterogeneity exists within pediatric DTC, with younger children (<10 years) often presenting more aggressive disease than adolescents (10-18 years).

Purpose of the Study:

• To investigate the expression of thyroid-specific genes (NIS, PDS, TSHR) in pediatric DTC.
• To compare gene expression patterns between different pediatric age groups (children vs. adolescents) and adults.
• To re-evaluate the assumption of universally higher thyroid-specific gene expression in pediatric DTC compared to adults.

Main Methods:

• Analysis of thyroid-specific gene expression (NIS, PDS, TSHR) in 38 sporadic pediatric DTC tumors.
• Comparison of gene expression levels between younger children (<10 years) and adolescents (≥10-18 years).
• Linear regression analysis to confirm associations between gene expression and age.

Main Results:

• NIS, PDS, and TSHR expression was significantly lower in children (<10 years) compared to adolescents (≥10-18 years).
• A linear association was confirmed between NIS expression and patient age.
• NIS expression in children was similar to adults, while PDS and TSHR expression was lower in children than in both adolescents and adults.

Conclusions:

• The biological behavior of DTC in adolescents may differ from that in younger children and adults.
• The assumption that thyroid-specific gene expression is uniformly higher in pediatric DTC than in adult DTC is an oversimplification.
• Age-related differences in gene expression within pediatric DTC are significant and impact understanding of disease behavior and treatment response.