A national database analysis for factors associated with thyroid cancer occurrence

Area of Science:

• Endocrinology
• Epidemiology
• Public Health

Background:

• Thyroid cancer incidence has been rising globally, prompting research into contributing environmental and lifestyle factors.
• Understanding these associations is crucial for developing targeted prevention and screening strategies.

Purpose of the Study:

• To investigate the associations between various environmental and lifestyle factors and the occurrence of thyroid cancer.
• To identify specific risk and protective factors for thyroid cancer in a large, representative population cohort.

Main Methods:

• Analysis of a national sample cohort from the Korean National Health Insurance Service database (2006-2015).
• Categorization of the cohort based on age, body mass index (BMI), income, residential area, exercise, alcohol consumption, diet, smoking status, and thyroid disease history (hypothyroidism/hyperthyroidism).
• Statistical analysis to determine hazard ratios (HR) and 95% confidence intervals (CI) for thyroid cancer occurrence.

Main Results:

• For men, older age (≥55 years), lower income, and current smoking were associated with lower thyroid cancer occurrence. Conversely, higher BMI (≥25 kg/m2), higher income, urban residence, and pre-existing hypothyroidism or hyperthyroidism were linked to increased risk.
• For women, older age (≥55 years), moderate alcohol drinking, and current smoking showed lower thyroid cancer occurrence. Higher BMI (≥25 kg/m2), frequent exercise, higher income, urban residence, and hypothyroidism or hyperthyroidism were associated with higher occurrence.
• Key factors associated with lower occurrence in both sexes included older age and current smoking. Factors linked to higher occurrence in both sexes were higher BMI, higher income, urban residence, and the presence of hypothyroidism or hyperthyroidism.

Conclusions:

• Age and smoking status are significant protective factors against thyroid cancer.
• Factors such as elevated BMI, higher socioeconomic status (income), urban living, and thyroid dysfunction (hypothyroidism/hyperthyroidism) are associated with an increased risk of thyroid cancer in both men and women.
• These findings highlight the importance of considering a range of environmental and lifestyle factors in the etiology and prevention of thyroid cancer.