Causal effects of thyroid volume change on thyroid disease: a Mendelian randomization study

Area of Science:

• Endocrinology
• Genetics
• Epidemiology

Background:

• Observational studies suggest thyroid volume changes correlate with thyroid disease.
• The causal relationship between thyroid volume and thyroid disease remains unclear.

Purpose of the Study:

• To assess the causal effect of thyroid volume on common benign and malignant thyroid diseases using a two-sample Mendelian randomization approach.

Main Methods:

• Utilized genome-wide association studies (GWAS) summary data.
• Selected gene loci strongly associated with thyroid volume as instrumental variables.
• Employed five complementary two-sample Mendelian randomization methods.

Main Results:

• Established a causal link between thyroid volume and various thyroid diseases, including autoimmune thyroid disease, Hashimoto's thyroiditis, Graves' disease, hyperthyroidism, multinodular goiters, and benign thyroid neoplasms.
• Found that increased thyroid volume is associated with a reduced risk of thyroid carcinoma (OR = 0.401).
• Identified a significant association between thyroid volume and thyroid stimulating hormone (TSH) levels.

Conclusions:

• Confirmed a causal relationship between thyroid volume and certain thyroid diseases.
• Demonstrated that higher thyroid volume offers a protective effect against thyroid carcinoma.
• Suggests monitoring thyroid volume may aid in preventing clinical thyroid diseases.