OC-038 The age-dependent relationship of dietary antioxidant intake and the risk of barrett’s oesophagus and oesophageal adenocarcinoma: a uk prospective cohort study using micronutrient data from food diaries and serum biomarkers
Bibliographic record
Abstract
Introduction The development of both Barrett’s oesophagus (BO) and oesophageal adenocarcinoma (OAC) may involve oxidative stress. We investigated whether the antioxidants vitamins C and E, selenium, zinc and carotene were associated with a decreased risk of BO and OAC, in the same population, using nutritional information from 7-day food diaries, the most accurate questionnaire-based methodology. Method A cohort of 23,658 initially well individuals, aged 40–74 years, enrolled in the European Prospective Investigation of Cancer-Norfolk Study completed 7-day food diaries. Serum vitamin C levels were measured. They were monitored till December 2008 to identify those diagnosed with BO and OAC, confirmed through reviewing medical records. Hazard ratios (HRs) for these two conditions were estimated for each quintile of intake, corrected for age, gender, BMI and smoking. The analyses were repeated in participants younger and older than 65 years at recruitment, the mid-point of the peak prevalence of BO. Results 92 participants who developed BO and 61 OAC were compared with 3712 randomly selected controls. In the whole cohort, and in those aged above 65 years at recruitment, there were no associations between any antioxidant and the risk of developing BO or OAC. However, in participants aged less than 65 years at recruitment, for BO statistically non-significant inverse associations were observed between all quintiles of food-diary assessed vitamin C intake (highest vs lowest quintile HR = 0.49, 95% CI = 0.20–1.22), with a significant inverse trend across quintiles for serum vitamin C and BO risk (Trend HR = 0.76; CI = 0.59–0.97; P = 0.03). For the development of OAC in participants recruited when less than 65 years, there were significant inverse trends across quintiles for both dietary vitamin C intake (Trend HR = 0.65; CI = 0.44–0.96; P = 0.03) and serum vitamin C (Trend HR = 0.54; CI = 0.33–0.89; P = 0.02). In this group there was a borderline significant inverse trend between vitamin E intake and OAC (Trend HR = 0.70; CI = 0.48–1.01; P = 0.06), but no associations with zinc, selenium or carotenes. Conclusion Vitamin C deficiency may be involved in the aetiology of BO and possibly OAC, and may influence carcinogenesis below 65 years of age. Vitamin E may prevent the malignant progression of BO to OAC, again in younger individuals. Vitamins C and E levels should be measured in future aetiological studies for these conditions and randomised controlled trials of their use to prevent the malignant progression of BO may be justified. Disclosure of interest None Declared.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".