Cited by 122Antioxidant Activity and Oxidative StressLung Cancer Diagnosis and TreatmentSmoking Behavior and Cessation

Beta‐carotene in multivitamins and the possible risk of lung cancer among smokers versus former smokers: A meta‐analysis and evaluation of national brands

Tanvetyanon, Tawee, Bepler, Gerold·2008·Cancer

Abstract

BACKGROUND: Some studies have suggested that beta-carotene supplementation may increase the risk of lung cancer, particularly among smokers or former smokers. Beta-carotene, a provitamin A, is available in multivitamins. In the current study, the authors investigated the risk of lung cancer associated with beta-carotene in smokers or former smokers and surveyed the beta-carotene content in national brand multivitamins. METHODS: The authors systemically reviewed the published literature using a search of the MEDLINE database and performed a meta-analysis of large randomized trials that reported on the effect of beta-carotene supplementation on the incidence of lung cancer among smokers or former smokers. A sample of multivitamins was evaluated for their beta-carotene content and the suggested daily dosage. RESULTS: Four studies contributing 109,394 subjects were available for analysis. The average daily beta-carotene dosage in these trials ranged from 20 to 30 mg daily. Among current smokers, beta-carotene supplementation was found to be significantly associated with an increased risk of lung cancer (odds ratio [OR], 1.24; 95% confidence interval [95% CI], 1.10-1.39). Among former smokers, there was no significant increase noted (OR, 1.10; 95% CI, 0.84-1.45). In a sample of 47 common multivitamins, beta-carotene was present in 70% of the identified formulas. The median dosage of beta-carotene was 0.3 mg (range, 0-17.2 mg) daily. The beta-carotene content was found to be significantly higher among multivitamins sold to improve visual health than among other multivitamins, with a median daily dosage of 3 mg (range, 0-24 mg). CONCLUSIONS: High-dose beta-carotene supplementation appears to increase the risk of lung cancer among current smokers. Although beta-carotene was prevalent in multivitamins, high-dose beta-carotene was observed among multivitamin formulas sold to promote visual health.

Integrity signals

Registry

Crossref · 10.1002/cncr.23527

Cites

23 of 23 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • In certain situations, antioxidant micronutrients may be harmful (eg, β-carotene supplementation increased lung cancer risk in smokers).

    “In certain situations, antioxidant micronutrients may be harmful (eg, β-carotene supplementation increased lung cancer risk in smokers).”

    From Micronutrient Supplementation to Reduce Cardiovascular Risk (2022) · cites this paper as [45]

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Tanvetyanon, T., & Bepler, G.
Affiliations
  • University of South Florida (US)
  • Moffitt Cancer Center (US)
Corresponding author
Tanvetyanon, Tawee
Venue
Cancer
Publisher
Wiley
Published
2008-06-20
Volume
113
Issue
1
Pages
150-157
ISSN
  • 0008-543X (ISSN-L)
  • 1097-0142
OpenAlex
W1998258175
Cited by
122
References
23
Citations by year
2026: 4 · 2025: 3 · 2024: 9 · 2023: 6 · 2022: 4 · 2021: 7 · 2020: 6 · 2019: 8 · 2018: 8 · 2017: 7 · 2016: 9 · 2015: 6 · 2014: 9 · 2013: 10 · 2012: 9
FWCI
3.23
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Diagnosis and Treatment
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
Keywords
beta-carotene, lung cancer, smokers, former smokers, multivitamins, vitamin supplementation, provitamin A
MeSH terms
Adult, Aged, Aged, 80 and over, Female, Humans, Lung Neoplasms, Male, Middle Aged, Smoking, Randomized Controlled Trials as Topic, Smoking Cessation, Risk Assessment, beta Carotene, Dietary Supplements

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review