[Objective] To investigate the trends of incidence and change in the age distribution of thyroid cancer in Lianyungang city from 2008 to 2020. [Methods] The information of diagnostic thyroid cancer cases (ICD-10: C73) from 2008 to 2020 were selected from Lianyungang cancer registry system. The crude incidence rate (CR) , the standardized incidence rate by Chinese population (ASIRC), the incidence of different age groups, crude and standardized average diagnostic age of thyroid cancer were calculated by sex and regions. And to calculate the average annual percent change (AAPC) for analyzing the trend of the indicators. The linear regression model was used to analyze the relationship between average diagnostic age and year. A birth cohort model was constructed to analyze the incidence of thyroid cancer among the people born from 2008 to 2020 and its incidence trend. [Results] In Lianyungang city, the crude incidence and ASIRC of thyroid cancer among total population, the male, the female, urban and rural areas all showed upward trends from 2008 to 2020 (CR: AAPC =16.29%,14.52%,16.83%,14.39%,17.22%; ASIRC: AAPC=16.22%, 14.43%, 16.53%, 14.88%, 16.98%; P <0.001, for all.). The incidence of thyroid cancer in all age groups of women, and the other six age groups of total population and men (except 70-79 years old) all showed upward trends with time (P < 0.05). And the incidence rate of thyroid cancer in the 30-39 age group increased the most annually (P<0.05). The crude and standardized average diagnostic age of thyroid cancer among total population, the male, the female and urban areas all showed downward trends from 2008 to 2020 in Lianyungang (P < 0.05). The incidence of thyroid cancer in the same age group of people with different birth years showed an upward trend as the birth year went on. And in Lianyungang city from 2008 to 2020, the incidence rate of thyroid cancer among the female was higher than that of the male, and the ASIRC of thyroid cancer among the female was average 3.48 times that of the male. The incidence rate of thyroid cancer in urban areas was higher than that in rural areas. [Conclusions] In Lianyungang city, the incidence rate of thyroid cancer showed an increasing trend from 2008 to 2020, while the average diagnostic age showed a downward trend during the same period. And urban areas and women over 30 years old were the key targets for thyroid cancer prevention and control. |