1. A dose-response meta-analysis reveals an association between vitamin B12 and colorectal cancer risk.
- Author
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Nai-Hui Sun, Xuan-Zhang Huang, Shuai-Bo Wang, Yuan Li, Long-Yi Wang, Hong-Chi Wang, Chang-Wang Zhang, Cong Zhang, Hong-Peng Liu, Zhen-Ning Wang, Sun, Nai-Hui, Huang, Xuan-Zhang, Wang, Shuai-Bo, Li, Yuan, Wang, Long-Yi, Wang, Hong-Chi, Zhang, Chang-Wang, Zhang, Cong, Liu, Hong-Peng, and Wang, Zhen-Ning
- Subjects
COLON cancer risk factors ,VITAMIN B in human nutrition ,DOSE-response relationship in biochemistry ,BLOOD testing ,EVIDENCE-based medicine ,COLON tumors ,COMPARATIVE studies ,DIET ,RESEARCH methodology ,MEDICAL cooperation ,META-analysis ,RECTUM tumors ,RESEARCH ,VITAMIN B12 ,EVALUATION research - Abstract
Objective: The current meta-analysis evaluated the association between vitamin B12 intake and blood vitamin B12 level and colorectal cancer (CRC) risk.Design: The PubMed and EMBASE databases were searched. A dose-response analysis was performed with generalized least squares regression, with the relative risk (RR) and 95 % CI as effect values.Setting: The meta-analysis included seventeen studies.Subjects: A total of 10 601 patients.Results: The non-linear dose-response relationship between total vitamin B12 intake and CRC risk was insignificant (P=0·690), but the relationship between dietary vitamin B12 intake and CRC risk was significant (P<0·001). Every 4·5 μg/d increment in total and dietary vitamin B12 intake was inversely associated with CRC risk (total intake: RR=0·963; 95 % CI 0·928, 0·999; dietary intake: RR=0·914; 95 % CI 0·856, 0·977). The inverse association between vitamin B12 intake and CRC risk was also significant when vitamin B12 intake was over a dosage threshold, enhancing the non-linear relationship. The non-linear dose-response relationship between blood vitamin B12 level and CRC risk was insignificant (P=0·219). There was an insignificant association between every 150 pmol/l increment in blood vitamin B12 level and CRC risk (RR=1·023; 95 % CI 0·881, 1·187).Conclusions: Our meta-analysis indicates that evidence supports the use of vitamin B12 for cancer prevention, especially among populations with high-dose vitamin B12 intake, and that the association between CRC risk and total vitamin B12 intake is stronger than between CRC risk and dietary vitamin B12 intake only. [ABSTRACT FROM AUTHOR]- Published
- 2016
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