Incidence and mortality of thyroid cancer in 50 countries: a joinpoint regression analysis of global trends

Purpose To evaluate the incidence and mortality trend of thyroid cancer, and compare its global incidence trends among different countries by age group and sex.Methods Data on age-standardized incidence and mortality rate of thyroid cancer among 50 countries were collected from the Cancer Incidence in Five Continents Volume XI; the Surveillance, Epidemiology, and End Results Program (SEER), the National Cancer Institute; the Nordic Cancer Registries (NORDCAN), and the WHO mortality database. The Average Annual Percent Change (AAPC) of the incidence and mortality trends was calculated by joinpoint regression analysis.Results The age-standardized incidence of thyroid cancer was 3.1 and 10.1 cases per 100,000 persons in men and women, respectively. The incidence of thyroid cancer increased in most countries among individuals irrespective of age groups, and increased in populations aged < 40 years in several countries, including Korea (male: AAPC 25.3, 95% C.I. 22.3-28.4, p < 0.001; female: AAPC 18.5, 95% C.I. 16.2-20.9, p < 0.001), Poland (male: AAPC 19.1, 95% C.I. 1.4-39.7, p = 0.036; female: AAPC 13.7, 95% C.I. 7.6-20.2), and China (male: AAPC 18.6, 95% C.I. 12.1-25.5, p < 0.001; female: AAPC 13.3, 95%C.I. 11.5-15.1, p < 0.001).Conclusion An increasing incidence of thyroid cancer was observed in younger subjects in a majority of countries, high-lighting the need for more preventive strategies in this population and possible avoidance of over-diagnosis.

Automated summary

This study evaluated the incidence and mortality trends of thyroid cancer and compared the global trends among different age groups and sexes. The results showed an increasing incidence of thyroid cancer in most countries, regardless of age groups, especially among young populations in Korea, Poland, and China. Therefore, it highlights the importance of implementing more preventive strategies and avoiding over-diagnosis.