[Incidence trends and age-period-cohort analysis of lip and oral cancer in China, 1990-2021].

<b>Objective:</b> To analyze the incidence trend of lip and oral cancer in China from 1990 to 2021. <b>Methods:</b> The incidence data of lip and oral cancer in China from 1990 to 2021 were obtained through the Global Health Data Exchange (GHDx) database, including incidence rates by gender and age-standardized incidence rates. Joinpoint regression was used to analyze the trend of lip and oral cancer incidence rate. Age-period-cohort (APC) model was adopted to estimate the effects of Age, Period and Cohort on the incidence of lip and oral cancer in China. <b>Results:</b> The crude and age-standardized incidence rates of lip and oral cancer in China from 1990 to 2021 showed an increasing trend, and the crude incidence rates of the whole population, male and female in the year 2021 increased by 216.8%, 266.7% and 130.4%, respectively, compared with 1990. The age effect, period effect and birth cohort effect of the incidence risk of lip and oral cancer in China were statistically significant (all <i>P</i><0.05). People of older the age and the more recent the birth cohort, the higher the incidence risk. <b>Conclusions:</b> The incidence of lip and oral cancer is on the rise in China from 1990 to 2021. Age, period and birth cohort are all the factors affecting the incidence of lip and oral cancer.