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Exposure of Sprague-Dawley rats to a 50-Hertz, 100-microTesla magnetic field for 27 weeks facilitates mammary tumorigenesis in the 7,12-dimethylbenz[a]-anthracene model of breast cancer

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Authors not listed · 1999

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Power line frequency magnetic fields at everyday exposure levels significantly accelerated breast cancer development in laboratory rats.

Plain English Summary

Summary written for general audiences

German researchers exposed female rats to power line frequency magnetic fields (50 Hz, 100 microTesla) for 27 weeks while inducing breast cancer with a chemical carcinogen. The magnetic field exposure significantly increased mammary tumor development by 190% at 13 weeks and final tumor rates reached 64.7% in exposed rats versus 50.5% in controls.

Why This Matters

This study provides compelling evidence that power line frequency magnetic fields can act as cancer promoters, accelerating tumor development once the cancer process has begun. The 100 microTesla exposure level used here is well within the range of everyday exposures - you'll encounter similar or higher fields near household appliances, electric blankets, and power lines. What makes this research particularly significant is its rigorous 27-week duration and blinded methodology. The 190% increase in tumor incidence at 13 weeks represents a substantial biological effect that cannot be dismissed as statistical noise. While this used a chemical carcinogen to initiate cancer, the magnetic fields clearly facilitated tumor growth and development. The reality is that we're all exposed to multiple potential carcinogens in modern life, and this research suggests that chronic EMF exposure may amplify their effects.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (1999). Exposure of Sprague-Dawley rats to a 50-Hertz, 100-microTesla magnetic field for 27 weeks facilitates mammary tumorigenesis in the 7,12-dimethylbenz[a]-anthracene model of breast cancer.
Show BibTeX
@article{exposure_of_sprague_dawley_rats_to_a_50_hertz_100_microtesla_magnetic_field_for_27_weeks_facilitates_mammary_tumorigenesis_in_the_712_dimethylbenza_anthracene_model_of_breast_cancer_ce1559,
  author = {Unknown},
  title = {Exposure of Sprague-Dawley rats to a 50-Hertz, 100-microTesla magnetic field for 27 weeks facilitates mammary tumorigenesis in the 7,12-dimethylbenz[a]-anthracene model of breast cancer},
  year = {1999},
  
  
}
PubMed: 10446973

Quick Questions About This Study

Yes, this study found that 100 microTesla magnetic fields at 50 Hz significantly increased mammary tumor development in rats, with tumor incidence reaching 64.7% in exposed animals versus 50.5% in controls after 26 weeks.
100 microTesla is within typical household exposure ranges. Hair dryers produce 6-2000 microTesla, electric blankets 15-100 microTesla, and areas near power lines can reach 57 microTesla, making this study exposure level environmentally relevant.
The extended 27-week exposure period allowed researchers to observe both early acceleration of tumor development (190% increase at 13 weeks) and sustained promotion of cancer growth throughout the study duration.
DMBA (7,12-dimethylbenz[a]anthracene) is a chemical carcinogen used to reliably induce mammary tumors in laboratory rats, creating a standardized model for studying factors that promote or inhibit breast cancer development and progression.
This research suggests yes - while the magnetic fields didn't initiate cancer alone, they significantly facilitated tumor development and growth when combined with a chemical carcinogen, demonstrating a cancer-promoting effect.