Colonoscopic screening is associated with reduced Colorectal Cancer incidence and mortality: a systematic review and meta-analysis

Jiaxin Zhang; Guang Chen; Zhiguo Li; Peng Zhang; Xiaoke Li; Da'nan Gan; Xu Cao; Hongbo Du; Jiaying Zhang; Ludan Zhang; Yong'an Ye

doi:10.7150/jca.46661

Colonoscopic screening is associated with reduced Colorectal Cancer incidence and mortality: a systematic review and meta-analysis

J Cancer. 2020 Aug 15;11(20):5953-5970. doi: 10.7150/jca.46661. eCollection 2020.

Authors

Jiaxin Zhang^{1

2}, Guang Chen^{1

2}, Zhiguo Li^{1

2}, Peng Zhang^{1

2}, Xiaoke Li^{1

2}, Da'nan Gan^{1

2}, Xu Cao^{1

2}, Hongbo Du^{1

2}, Jiaying Zhang³, Ludan Zhang^{1

2}, Yong'an Ye^{1

2}

Affiliations

¹ Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China.
² Institute of Liver Diseases, Beijing University of Chinese Medicine.
³ Ministry of Education Key Laboratory of Bioinformatics, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China.

Abstract

It is the great priority to detect colorectal cancer (CRC) as early as possible, finally to reduce the incidence and mortality of CRC. However, although colonoscopy is recommended in many consensuses, yet no one systematic review is conducted to figure out how colonoscopy could change the incidence and mortality. In our study, we conducted a comprehensive meta-analysis to evaluate the association between colonoscopy screening and the incidence or mortality of CRC. PubMed, EMBASE, and PMC database were systematically searched from their inception to June 2020. A total of 13 cohort and 16 case-control studies comprising 4,713,778 individuals were obtained in this review. Our results showed that colonoscopy was associated with a 52% RR reduction in incidence of CRC (RR: 0.48, 95% CI: 0.46-0.49) and 62% RR reduction in mortality of CRC (RR: 0.38, 95% CI: 0.36-0.40). Subgroup analysis of different interventions, study design, country, sample size, age or sex showed that the incidence and mortality reduction remained consistent, and colonoscopy screening had the same effect on people below and above 50. Our study indicated that colonoscopy could significantly reduce the incidence and mortality of CRC.

Keywords: colonoscopy; colorectal cancer; incidence and mortality; meta-analysis.