Temporal trends of burden and risk factors of early-onset cancer in China from 2000 to 2019
Objective To reveal the trends of the burden and risk factors of early-onset cancer in China from 2000 to 2019.Methods Data were obtained from the 2019 Global Burden of Disease Study.Indicators including incidence,mortality,and disability-adjusted life year(DALY)were used to describe the burden of early-onset cancer in population aged 15 to 49 years,and the population attributable fraction(PAF)of DALY was used to estimate the proportion attributable to modifiable risk factors.Estimated annual percentage change(EAPC)and its 95%CI were applied to estimate the temporal trends of the burden of early-onset cancer from 2000 to 2019.Results In 2019,the rates of incidence,mortality,and DALY of early-onset cancer were 109.0/100 000,35.8/100 000,and 1 763.7/100 000,respec-tively.Early-onset breast cancer,colorectal cancer,and stomach cancer accounted for the highest proportion of newly-diagnosed cases for all early-onset cancers;early-onset lung cancer,liver cancer,and stomach cancer accounted for the highest proportion of death cases for all early-onset cancers.35.8%DALYs imposed by early-onset cancer were attributable to modifiable risk factors.Tobacco use(PAF=16.0%)was the leading risk factor of early-onset cancer,followed by dietary risks(6.1%)and alcohol use(5.9%).From 2000 to 2019,the inci-dence rate of early-onset cancer increased(EAPC=2.0%,95%CI:1.6%-2.3%),whereas the rates of mortality(EAPC=-1.1%,95%CI:-1.4%--0.7%)and DALY(EAPC=-1.2%,95%CI:-1.5%--0.8%)decreased.The proportion of incident cases of early-onset liver cancer decreased in rank from the first position in 2000 to the 8th position in 2019;the proportion of incident cases of early-onset colorectal cancer increased in rank from the 6th position in 2000 to the second position in 2019.Compared with 2000(32.0%),PAF for the risk factors of early-onset cancer increased by 11.9%in 2019.Conclusions The incidence of early-onset cancer increased in China,whereas mor-tality and disability had been effectively controlled.The change in proportions of different early-onset cancers showed heterogeneity.It is significantly important to strengthen interventions for risk factors to reduce the burden of early-onset cancer.