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Tooth loss and risk of colorectal cancer: a dose–response meta-analysis of prospective cohort studies

Authors Ma P, Dai S, Jin C, Yao Y, Zou C

Received 6 September 2017

Accepted for publication 30 January 2018

Published 21 March 2018 Volume 2018:11 Pages 1617—1623


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Faris Farassati

Peng Ma, Shaojun Dai, Can Jin, Yonggang Yao, Chuanxin Zou

Department of Gastroenterology, The Second Clinical Medical College, Yangtze University, Jingzhou, Hubei Province, People’s Republic of China

Background: Previous studies have indicated that tooth loss is associated with colorectal cancer risk but have presented controversial results.
Methods: We conducted a dose–response meta-analysis in order to investigate the correlation between tooth loss and colorectal cancer risk. Up to August 2017, six eligible studies were included in this meta-analysis.
Results: Our results showed statistically significant association between tooth loss and colorectal cancer (OR =1.08, 95% CI: 1.03–1.15, P<0.001). In addition, we obtained the best fit at an inflection point of every two tooth loss in piecewise regression analysis, and the summary relative risk (RR) of colorectal cancer for an increase of every two tooth loss was 1.06 (95% CI: 1.02–1.11, P<0.001). Furthermore, tooth loss was significantly associated with colorectal cancer risk in Caucasia (RR: 1.18; 95% CI: 1.09–1.28; P<0.001) and Asia (RR: 1.06; 95% CI: 1.02–1.10; P<0.001). Moreover, tooth loss was significantly associated with a higher risk of colon cancer (RR: 1.09; 95% CI: 1.02–1.17; P<0.001) and rectal cancer (RR: 1.08; 95% CI: 1.01–1.17; P<0.001).
Conclusion: Subgroup meta-analyses showed consistency with the primary findings. Considering these promising results, increasing tooth loss may be harmful to our health, and maintenance of our oral health is essential.

Keywords: colorectal cancer, tooth loss, dose–response relationship, meta-analysis

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