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Evaluation of Mobile Phone and Cordless Phone Use and Glioma Risk Using the Bradford Hill Viewpoints from 1965 on Association or Causation.

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Carlberg M, Hardell L. · 2017

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Heavy mobile phone users face double the risk of deadly brain tumors after 20+ years of use.

Plain English Summary

Summary written for general audiences

Researchers used a rigorous scientific framework to evaluate whether mobile and cordless phone use causes brain tumors called gliomas. They found that people with the highest phone use had a 90% increased risk of developing gliomas, with risk doubling for those using wireless phones for 20+ years. The study concluded that radiofrequency radiation from phones should be classified as a human carcinogen.

Why This Matters

This research represents one of the most comprehensive analyses of the phone-brain tumor connection to date, applying the same scientific criteria used to establish smoking as a cause of lung cancer. The Bradford Hill criteria are the gold standard for determining causation in epidemiology, and this study demonstrates that wireless phone radiation meets all nine criteria. What makes these findings particularly concerning is the dose-response relationship: the longer people used phones, the higher their brain tumor risk became. The doubling of risk after 20+ years of use is especially troubling given that many people today have been using mobile phones for decades. The science demonstrates a clear pattern that regulatory agencies can no longer ignore, yet current safety standards remain based on outdated assumptions that EMF only causes harm through heating tissue.

Exposure Information

Specific exposure levels were not quantified in this study.

Study Details

Bradford Hill's viewpoints from 1965 on association or causation were used on glioma risk and use of mobile or cordless phones.

All nine viewpoints were evaluated based on epidemiology and laboratory studies

Strength: meta-analysis of case-control studies gave odds ratio (OR) = 1.90, 95% confidence interval...

RF radiation should be regarded as a human carcinogen causing glioma.

Cite This Study
Carlberg M, Hardell L. (2017). Evaluation of Mobile Phone and Cordless Phone Use and Glioma Risk Using the Bradford Hill Viewpoints from 1965 on Association or Causation. Biomed Res Int. 2017:9218486, 2017.
Show BibTeX
@article{m_2017_evaluation_of_mobile_phone_1952,
  author = {Carlberg M and Hardell L.},
  title = {Evaluation of Mobile Phone and Cordless Phone Use and Glioma Risk Using the Bradford Hill Viewpoints from 1965 on Association or Causation.},
  year = {2017},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/28401165/},
}
PubMed: 28401165

Cited By (99 papers)

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Quick Questions About This Study

Yes, this 2017 analysis found that using wireless phones for 20+ years doubled glioma risk, with an odds ratio of 2.01. The study used the Bradford Hill criteria to evaluate causation and concluded that radiofrequency radiation should be classified as a human carcinogen.
The highest mobile phone users showed a 90% increased glioma risk compared to minimal users, with an odds ratio of 1.90. This meta-analysis of case-control studies found the strongest association in people with the greatest cumulative wireless phone exposure over time.
Yes, this study found increased glioma risk specifically in the temporal lobe, which is the brain area closest to where people typically hold phones during calls. This spatial specificity supports the biological plausibility of radiofrequency radiation causing brain tumors.
The study identified that radiofrequency radiation increases reactive oxygen species (ROS) production, which can damage cells. Animal studies showed increased glioma rates in RF-exposed rats, and antioxidants reduced this oxidative stress, supporting the biological mechanism for tumor development.
The researchers concluded that radiofrequency radiation from mobile and cordless phones should be classified as a human carcinogen. They applied the rigorous Bradford Hill criteria for causation and found sufficient evidence linking wireless phone use to glioma development.