Meta-analysisindependent cross-checkabstract checked I-CHK-133 standard review
The chicken-linked mutagen PhIP was not linked to bowel cancer in pooled cohorts
A Prospective Pooled Analysis of Meat Mutagens and Colorectal Adenoma and Cancer in the US and EPIC Studies: Findings with an Emphasis on Improving Exposure Measurements.
Overview
Nguyen LC et al.. Asian Pac J Cancer Prev 2022 · PMID 35901325 · DOI 10.31557/APJCP.2022.23.7.2215
PhIP was associated with bowel polyps (HR 1.19) but not with bowel cancer (HR 1.00).
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Are meat-derived HCAs associated with colorectal adenoma and cancer in prospective cohorts?
- How was the study done?
Pooled analysis of published HRs from 7 prospective cohorts (US and EPIC)
- How many people, animals or samples were studied?
7 cohorts
- What was actually found?
CRC: PhIP HR 1.00 (0.91-1.09); MeIQx HR 1.12 (1.03-1.22); DiMeIQx 1.03 (0.87-1.22); MDM 1.11 (1.00-1.23). CRA: PhIP HR 1.19 (1.02-1.39); MeIQx 1.17 (1.01-1.35). Chicken contributed 54-74% of PhIP intake; red meat 83-92% of MeIQx. Estimated PhIP intake differed remarkably between studies.
- How large was the observed effect?
CRC: PhIP HR 1.00 (0.91-1.09); MeIQx HR 1.12 (1.03-1.22); DiMeIQx 1.03 (0.87-1.22); MDM 1.11 (1.00-1.23). CRA: PhIP HR 1.19 (1.02-1.39); MeIQx 1.17 (1.01-1.35). Chicken contributed 54-74% of PhIP intake; red meat 83-92% of MeIQx. Estimated PhIP intake differed remarkably between studies.
- What do the results mean in everyday life?
Charring meat forms mutagens, but the cancer evidence for the chicken-related one is weak.
- What are the study's limitations?
Simple pooling of published estimates; Exposure estimates vary widely; Journal of limited standing
- What does it say about Elawady's specific claim?
Formation claim unaffected; limits the health relevance.
- Do the results apply to Germany and Europe?
Includes EPIC (Europe).
- What can explicitly not be concluded from this study?
Cannot exclude small effects.
Scientific in-depth review
1. Full reference
- Authors
- Nguyen LC et al.
- Journal
- Asian Pac J Cancer Prev
- Year
- 2022
- Identifier
- PMID 35901325 DOI 10.31557/APJCP.2022.23.7.2215
- Verification
- verified – PubMed efetch 2026-10-26; Crossref 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract
2. Research question
Are meat-derived HCAs associated with colorectal adenoma and cancer in prospective cohorts?
3. Study design and population
- Study design
- Meta-analysis – Pooled analysis of published HRs from 7 prospective cohorts (US and EPIC)
- Population
Participants of 7 prospective cohorts
- Country
USA, Europe
- Period
published cohorts
- Sample size
7 cohorts
- Inclusion and exclusion criteria
as described in the abstract
4. Methods and endpoints
- Exposure / intervention
PhIP, MeIQx, DiMeIQx, meat-derived mutagenicity
- Comparator
Lowest intake
- Endpoints
Colorectal adenoma (CRA), colorectal cancer (CRC)
- Statistical methods
as reported in the abstract
5. Actual results
- Results
CRC: PhIP HR 1.00 (0.91-1.09); MeIQx HR 1.12 (1.03-1.22); DiMeIQx 1.03 (0.87-1.22); MDM 1.11 (1.00-1.23). CRA: PhIP HR 1.19 (1.02-1.39); MeIQx 1.17 (1.01-1.35). Chicken contributed 54-74% of PhIP intake; red meat 83-92% of MeIQx. Estimated PhIP intake differed remarkably between studies.
- Absolute risks
not reported
- Authors' conclusion
Positive association of MeIQx with CRC and CRA; exposure measurement needs improvement.
6. Strengths
- Prospective cohorts only
7. Weaknesses
- Simple pooling of published estimates
- Exposure estimates vary widely
- Journal of limited standing
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Search strategy limited (one keyword string).
9. Assessment of the statistical interpretation
PhIP, the HCA mainly from chicken, was associated with adenoma but not with colorectal cancer; the cancer signal was for MeIQx (mostly red meat).
10. Relevance to the specific claim
Tests whether the chicken-derived HCA (PhIP) predicts colorectal cancer in prospective data.
11. Independent contrary findings
12. Transferability to Germany and Europe
13. Overall methodological judgement
PhIP was associated with bowel polyps (HR 1.19) but not with bowel cancer (HR 1.00).
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- Grilling or pan-frying chicken breast forms potent carcinogens (PhIP up to 480 ng/g). – Studies with mixed or unclear results