Dong, Xuesi, Du, Lingbin, Luo, Zilin, Xu, Yongjie, Wang, Chenran, Wang, Fei, Cao, Wei, Zhao, Liang, Zheng, Yadi, Zhu, Hongting, Xia, Changfa, Li, Jiang, Du, Mulong, Hang, Dong, Ren, Jiansong, Shi, Jufang, Shen, Hongbing, Chen, Wanqing, Li, Ni, and He, Jie
Background: Screening reduces colorectal cancer (CRC) burden by allowing early resection of precancerous and cancerous lesions. An adequate selection of high-risk individuals and a high uptake rate for colonoscopy screening are critical to identifying people more likely to benefit from screening and allocating healthcare resources properly. We evaluated whether combining a questionnaire-based interview for risk factors with fecal immunochemical test (FIT) outcomes for high-risk assessment is more efficient and economical than a questionnaire-based interview-only strategy. Methods and findings: In this multicenter, population-based, prospective cohort study, we enrolled community residents aged 40 to 74 years in 29 provinces across China. From 2016 to 2020, a total of 1,526,824 eligible participants were consecutively enrolled in the Cancer Screening Program in Urban China (CanSPUC) cohort, and 940,605 were enrolled in the Whole Life Cycle of Cancer Screening Program (WHOLE) cohort, with follow-up to December 31, 2022. The mean ages were 56.89 and 58.61 years in CanSPUC and WHOLE, respectively. In the WHOLE cohort, high-risk individuals were identified by combining questionnaire-based interviews to collect data on risk factors (demographics, diet history, family history of CRC, etc.) with FIT outcomes (RF–FIT strategy), whereas in the CanSPUC cohort, high-risk individuals were identified using only interview-based data on risk factors (RF strategy). The primary outcomes were participation rate and yield (detection rate of advanced neoplasm, early-stage detection rate of CRCs [stage I/II], screening yield per 10,000 invitees), which were reported for the entire population and for different gender and age groups. The secondary outcome was the cost per case detected. In total, 71,967 (7.65%) and 281,985 (18.47%) individuals were identified as high-risk and were invited to undergo colonoscopy in the RF–FIT group and RF group, respectively. The colonoscopy participation rate in the RF–FIT group was 26.50% (19,071 of 71,967) and in the RF group was 19.54% (55,106 of 281,985; chi-squared test, p < 0.001). A total of 102 (0.53%) CRCs and 2,074 (10.88%) advanced adenomas were detected by the RF–FIT, versus 90 (0.16%) and 3,593 (6.52%) by the RF strategy (chi-squared test, both p < 0.001). The early-stage detection rate using the RF–FIT strategy was significantly higher than that by the RF strategy (67.05% versus 47.95%, Fisher's exact test, p = 0.016). The cost per CRC detected was $24,849 by the RF–FIT strategy versus $55,846 by the RF strategy. A limitation of the study was lack of balance between groups with regard to family history of CRC (3.5% versus 0.7%). Conclusions: Colonoscopy participation and screening yield were better with the RF–FIT strategy. The association with CRC incidence and mortality reduction should be evaluated after long-term follow-up. Author summary: Why was this study done?: ➢ The burden of colorectal cancer (CRC) in China has been growing in recent years. ➢ More specific selection of individuals to undergo colonoscopy, based on both questionnaire-based risk assessment and fecal immunochemical test (FIT) results, could result in more efficiency allocation of colonoscopy resources. ➢ There is limited evidence on the colonoscopy screening yield when combining FITs and risk assessment through questionnaires. What did the researchers do and find?: ➢ We calculated the baseline screening yield, participation, and cost per case detected in a national CRC screening program with a combined questionnaire-based risk assessment–FIT strategy. ➢ The baseline screening yield and participation rate were improved in the combined risk assessment–FIT group compared with risk factor assessment only group. ➢ The cost per CRC detected was $24,849 by the combined risk factor–FITs strategy, which was much lower than by the risk factor strategy ($55,846). What do these findings mean?: ➢ A combined CRC screening strategy is feasible in China. ➢ The association between the combined RF-FIT strategy with CRC incidence and mortality reduction should be evaluated after long-term follow-up. [ABSTRACT FROM AUTHOR]