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Meta-Analysis
. 2022 Aug 10;14(16):3274.
doi: 10.3390/nu14163274.

Diet-Derived Circulating Antioxidants and Risk of Digestive System Tumors: A Mendelian Randomization Study

Linlin Yin  1 , Haihao Yan  2 , Kangdi Chen  2 , Zuhong Ji  2 , Xiuhua Zhang  2 , Guozhong Ji  2 , Bin Zhang  1
Affiliations
Meta-Analysis

Diet-Derived Circulating Antioxidants and Risk of Digestive System Tumors: A Mendelian Randomization Study

Linlin Yin et al. Nutrients. .

Abstract

Previous observational case-control studies have shown significant controversy over the impact of dietary intake-related circulating antioxidants on the risk of digestive system tumors. We conducted a two-sample Mendelian randomized (MR) analysis to determine whether there was a significant causal relationship between increased levels of circulating antioxidants and digestive system tumors. Our circulating antioxidants (vitamin C, carotenoids, vitamin A, and vitamin E) were derived from absolute circulating antioxidants and circulating antioxidant metabolites, and their corresponding instrumental variables were screened from published studies. The digestive system tumors we studied included colorectal, gastric, pancreatic, liver, and esophageal cancer, and the corresponding summary GAWS (genome-wide association study) data were obtained from the UK Biobank database. We first evaluated the causal relationship between each tumor and circulating antioxidants and then used meta-analysis to summarize the results of MR analysis of different tumors. No significant associations were noted for genetically predicted circulating antioxidants and higher risk of digestive system tumors in our study. The pooled ORs (odds ratio) are 0.72 (95% CI: 0.46-1.11; β-carotene), 0.93 (95% CI: 0.81-1.08; lycopene), 2.12 (95% CI: 0.31-14.66; retinol), and 0.99 (95% CI: 0.96-1.02; ascorbate) for absolute circulating antioxidants; for circulating antioxidant metabolites, the pooled ORs for digestive system tumors risk per unit increase of antioxidants were 1.29 (95% CI: 0.39-4.28; α-tocopherol), 1.72 (95% CI: 0.85-3.49; γ-tocopherol), 1.05 (95% CI: 0.96-1.14; retinol), and 1.21 (95% CI: 0.97-1.51; ascorbate), respectively. Our study suggested that increased levels of dietary-derived circulating antioxidants did not reduce the risk of digestive system tumors.

Keywords: circulating antioxidants; digestive system tumors; mendelian randomization.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
The flow chart of our study design.
Figure 2
Figure 2
Causal association between absolute circulating antioxidants with digestive system tumors.
Figure 3
Figure 3
Causal association between circulating antioxidant metabolites with digestive system tumors.
See this image and copyright information in PMC

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