Format

Send to

Choose Destination
Medicine (Baltimore). 2017 Jul;96(27):e7470. doi: 10.1097/MD.0000000000007470.

Link between risk of colorectal cancer and serum vitamin E levels: A meta-analysis of case-control studies.

Author information

1
aAdministration Office, Jiangxi Provincial Center for Disease Control and Prevention bCadre Wards of Neurology Medicine, Jiangxi Provincial People's Hospital cDepartment of Pediatrics, The First Hospital of Nanchang, Jiangxi Province dDepartment of Science and Education, Jiangxi Provincial Cancer Hospital eDepartment of Abdominal Surgery, Jiangxi Provincial Cancer Hospital, Nanchang fSchool of Public Health, Zhejiang University, Hangzhou gDepartment of Public Health, Nanhui Mental Health Center, Pudong New Area, Shanghai hDepartment of Health Education, Jiangxi Provincial Center for Disease Control and Prevention iRemote Medical Consultation Center, Jiangxi Provincial People's Hospital, Nanchang, China.

Abstract

BACKGROUND:

The effect of low serum vitamin E levels on the risk of colorectal cancer (CRC) remains inconclusive. This meta-analysis aims to synthesize relevant studies to evaluate the association between serum vitamin E and the risk of CRC based on case-control studies.

METHODS:

Potentially relevant studies were selected by searching PubMed, EMBASE, and China National Knowledge Infrastructure databases according to inclusion and exclusion criteria. The association between serum vitamin E levels and CRC was estimated by the weighted mean difference (WMD) and 95% confidence interval (CI) using a random-effects model. Heterogeneity was evaluated using Q test and I statistic. Subgroup analysis was conducted to explore sources of heterogeneity. Sensitivity analysis was performed to reveal stability and reliability.

RESULTS:

A total of 10 papers with 11 studies, including 6431 subjects with 520 CRC patients and 5981 controls, were included in this present meta-analysis. The results indicated that compared with healthy controls, patients with CRC showed lower concentrations of serum vitamin E (WMD = -2.994 μmol/L, 95% CI = -4.395 to -1.593). Ethnicity subgroup analysis indicated that the serum vitamin E levels were lower in European (WMD = -1.82 μmol/L, 95% CI = -3.00 to -0.65), but not in Asian. Control-source subgroup analysis revealed that a significant association was observed in subgroup with hospital-based controls (WMD = -3.43 μmol/L, 95% CI = -6.27 to -0.59), but not in those with population-based controls. Sensitivity analysis suggested no significant difference in the pooled estimates, indicating stable results.

CONCLUSIONS:

CRC is associated with a lower concentration of serum vitamin E. However, necessary prospective cohort studies should be conducted to assess the effect of serum vitamin E on the risk of CRC in the future.

PMID:
28682917
PMCID:
PMC5502190
DOI:
10.1097/MD.0000000000007470
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wolters Kluwer Icon for PubMed Central
Loading ...
Support Center