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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

DNA & Genetic Damage

Lack of Mutation Induction with Exposure to 1.5 GHz Electromagnetic Near Fields Used for Cellular Phones in Brains of Big Blue Mice.

No Effects Found

Takahashi S, Inaguma S, Cho Y-M, Imaida K, Wang J, Fujiwara O, Shirai T · 2002

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Cell phone radiation at typical exposure levels showed no DNA damage in mouse brains after 4 weeks of daily exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed mice to 1.5 GHz radiofrequency radiation (the type used in cell phones) for 90 minutes daily over 4 weeks to test whether it could damage DNA in brain cells. They found no evidence of genetic mutations, brain tissue damage, or changes that might lead to brain tumors. The study suggests that cell phone radiation at these levels does not directly cause DNA damage in mouse brain tissue.

Why This Matters

This 2002 study represents an important piece of the puzzle in understanding whether cell phone radiation can directly damage DNA and potentially lead to brain cancer. The researchers used exposure levels up to 2.0 W/kg SAR, which is within the range of typical cell phone emissions (modern phones typically operate between 0.5-2.0 W/kg). What makes this research particularly valuable is its focus on genetic mutations, which are a key mechanism by which radiation could theoretically cause cancer. The science demonstrates no mutagenic effects even at relatively high exposure levels over a month of daily exposure. However, this is just one study with a specific exposure duration and frequency. The reality is that we use our phones for years or decades, not weeks, and other research has found biological effects from RF radiation that don't involve direct DNA damage. Put simply, while this study provides reassurance about direct genetic damage, it doesn't address the full spectrum of potential health effects from long-term cell phone use.

Exposure Details

SAR
2.0, 0.67, and 0 W/kg
Source/Device
1.5 GHz
Exposure Duration
90 min/day, 5 days/week, for 4 weeks

Exposure Context

This study used 2.0, 0.67, and 0 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 2.0, 0.67, and 0 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.50 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.50 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The possible mutagenic potential of exposure to 1.5 GHz electromagnetic near field (EMF) was investigated using brain tissues of Big Blue mice (BBM).

Male BBM were locally exposed to EMF in the head region at 2.0, 0.67, and 0 W/kg specific absorption...

No gliosis or degenerative lesions were histopathologically noted in brain tissues, and no obvious d...

These findings suggest that exposure to 1.5 GHz EMF is not mutagenic to mouse brain cells and does not create any increased hazard with regard to brain tumor development.

Cite This Study
Takahashi S, Inaguma S, Cho Y-M, Imaida K, Wang J, Fujiwara O, Shirai T (2002). Lack of Mutation Induction with Exposure to 1.5 GHz Electromagnetic Near Fields Used for Cellular Phones in Brains of Big Blue Mice. Cancer Res 62:1956-1960, 2002.
Show BibTeX
@article{s_2002_lack_of_mutation_induction_3435,
  author = {Takahashi S and Inaguma S and Cho Y-M and Imaida K and Wang J and Fujiwara O and Shirai T},
  title = {Lack of Mutation Induction with Exposure to 1.5 GHz Electromagnetic Near Fields Used for Cellular Phones in Brains of Big Blue Mice.},
  year = {2002},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/11929810/},
}
PubMed: 11929810

Cited By (34 papers)

Quick Questions About This Study

No, a 2002 study found that 1.5 GHz radiofrequency radiation did not cause genetic mutations in mouse brain cells. Researchers exposed mice to cell phone-type radiation for 90 minutes daily over 4 weeks and detected no DNA damage or changes that could lead to brain tumors.
The mice were exposed to 1.5 GHz electromagnetic fields for 90 minutes daily over a 4-week period. This exposure duration was designed to test whether cell phone-type radiation could cause DNA damage in brain tissue, but no genetic mutations were found.
No, 90 minutes of daily 1.5 GHz EMF exposure for 4 weeks did not damage mouse brain tissue. The study found no gliosis, degenerative lesions, or changes in brain cell death rates, suggesting this exposure level doesn't harm brain tissue structure or function.
The 1.5 GHz radiation did not cause any statistically significant mutations in Big Blue mice brains. While deletion mutations were slightly increased in exposed groups compared to controls, the differences were not significant enough to indicate actual genetic damage from the radiation.
No, exposure to 1.5 GHz cell phone frequency radiation did not increase brain tumor risk in mice. The 2002 study found no genetic mutations, tissue damage, or cellular changes that would suggest an increased hazard for brain tumor development from this type of EMF exposure.