Abstract: Objective The aim of this study was to evaluate the compliance of breast cancer screening among high-risk population in Chinese cities and analyze its related factors. Methods The data of 399,869 high-risk breast cancer patients in the urban cancer early diagnosis and treatment project carried out in 20 provinces in China from 2013 to 2018 were used for data analysis.All participants who met the research conditions of the Urban Cancer Early Diagnosis and Treatment Project were received a risk assessment questionnaire to assess the risk of cancer,and it was recommended that people whose assessment results were at high risk of breast cancer undergo corresponding screening(breast ultrasound and/or mammography).Chi-square tests were used to compare the differences in breast cancer screening participation rates among groups of different characteristics;Multivariate logistic regression models were used to explore the potential factors related to breast cancer screening participation rates. Results Among the 399,869 high-risk groups of breast cancer,221,268 participants received breast cancer screening,with a participation rate of 55.3%.According to the regional classification standards of the National Bureau of Statistics,breast cancer screening in the eastern China(55.7%,81,999/147,209),central(59.9%,76,368/127,594),and western(50.3%,62,901/125,066)regions.The participation rates were significant difference(χ²=2347.3,P＜0.001).The results of multivariate logistic regression analyses showed that 50~59 years old,still smoking,and currently quit smoking,an education with high school degree or above,secondhand smoke exposure,menopausal,reproductive history,a history of benign breast diseases,family history of breast or ovarian cancer were more likely to accept breast cancer screening.High-risk populations who were 60~74 years old,ethnic minorities,often participate in physical exercise,and had a history of breastfeeding were less likely to receive breast cancer screening. Conclusion The overall participation rate of screening of high-risk breast cancer populations in 20 provinces in China is low.Age,education,Ethnicity smoking,exposure to second-hand smoke physical activity,menopause,history of childbirth,breastfeeding history,benign breast disease,family history of breast or ovarian cancer are important factors related to breast cancer screening compliance.

Key words: Breast cancer, Screening, Compliance