Meta-analysis of antioxidant intake and the risk of esophageal and gastric cardia adenocarcinoma.
OBJECTIVE
The incidence of esophageal adenocarcinoma has been increasing rapidly among many countries. Antioxidant intake is a potentially modifiable protective factor, although the results from individual studies are inconclusive. We conducted a systematic review and statistical synthesis of studies that evaluated the associations between vitamin C, vitamin E, or beta-carotene/vitamin A and the risk of esophageal adenocarcinoma or the adjacent gastric cardia (gastroesophageal junction) adenocarcinoma.


METHODS
Studies were included if they reported (a) a measure of dietary antioxidant intake; (b) esophageal or cardia adenocarcinoma occurrence; and (c) a relative risk or odds ratio (OR) with confidence intervals (CI), or sufficient data to permit their calculation.


RESULTS
We identified 10 studies (1 cohort, 9 case-control; 1,057 esophageal and 644 cardia cases). Summary estimates stratified by cancer site suggested that higher intakes of vitamin C, beta-carotene/vitamin A, and vitamin E were inversely associated with the risk of esophageal adenocarcinoma (vitamin C, OR 0.49, 95% CI 0.39-0.62, P(heterogeneity)= 0.10; beta-carotene, OR 0.46, 95% CI 0.36-0.59, P(heterogeneity)= 0.82; vitamin E intake, OR 0.80, 95% CI 0.63-1.03, P(heterogeneity)= 0.59). Beta-carotene intake was also inversely associated with the risk of cardia adenocarcinoma (OR 0.57, 95% CI 0.46-0.72, P(heterogeneity)= 0.17). Dose effects were observed for most associations.


CONCLUSIONS
Pooled results from observational studies suggest that antioxidant intake may be protective against esophageal adenocarcinoma; the data do not support a consistent association between antioxidant intake and the risk of cardia carcinoma. These findings suggest possible etiological differences between these two adjacent malignancies.
Kubo
Ai
A
Kaiser Permanente Northern California, Division of Research, Oakland, California, and Columbia University, New York, New York, USA.
Corley
Douglas A
DA
D000230:Adenocarcinoma / Q000209:etiology*; D000975:Antioxidants; D002299:Cardia; D004032:Diet; D004938:Esophageal Neoplasms / Q000209:etiology*; D006801:Humans; D018570:Risk Assessment; D013274:Stomach Neoplasms / Q000209:etiology*
D000975:Antioxidants