8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Cancer & Tumors128 citations

Tumor promotion in a breast cancer model by exposure to a weak alternating magnetic field

Bioeffects Seen

Authors not listed · 1993

Share:

Power line frequency magnetic fields at 100 microtesla promoted 50% more breast tumors in rats.

Plain English Summary

Summary written for general audiences

Researchers exposed female rats to weak 50 Hz magnetic fields (100 microtesla) for 24 hours daily while giving them a chemical that causes breast cancer. The magnetic field-exposed rats developed 50% more mammary tumors than unexposed rats, and their tumors grew larger. This suggests that power line frequency magnetic fields can promote cancer growth.

Why This Matters

This 1993 study provides compelling evidence that the magnetic fields we encounter from power lines and electrical appliances can accelerate cancer development. The researchers used 100 microtesla exposure - a level you might experience standing directly under high-voltage power lines or very close to some household appliances. What makes this study particularly significant is its rigorous design: identical conditions for both groups, continuous 24-hour exposure, and clear statistical differences in tumor rates.

The findings align with epidemiological studies linking residential proximity to power lines with increased breast cancer risk. While the study used a chemical carcinogen to initiate tumors, the magnetic field exposure clearly accelerated their development and growth. This suggests EMF acts as a tumor promoter rather than initiator - meaning it may not cause cancer directly, but can fuel existing cancerous processes. The reality is that we're all exposed to these fields daily, and this research indicates that chronic exposure may create an environment where cancer can more easily take hold and flourish.

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 (1993). Tumor promotion in a breast cancer model by exposure to a weak alternating magnetic field.
Show BibTeX
@article{tumor_promotion_in_a_breast_cancer_model_by_exposure_to_a_weak_alternating_magnetic_field_ce1612,
  author = {Unknown},
  title = {Tumor promotion in a breast cancer model by exposure to a weak alternating magnetic field},
  year = {1993},
  doi = {10.1016/0304-3835(93)90100-N},
  
}
DOI: 10.1016/0304-3835(93)90100-NPubMed: 8364901

Quick Questions About This Study

Yes, this study found that continuous exposure to 100 microtesla 50 Hz magnetic fields for three months increased mammary tumor incidence by 50% in rats and caused tumors to grow larger compared to unexposed animals.
DMBA initiated the cancer process by causing DNA damage, while the 50 Hz magnetic field exposure acted as a tumor promoter, accelerating the development and growth of mammary tumors that might not have otherwise formed.
After just 8 weeks of continuous 50 Hz magnetic field exposure, rats showed significantly more mammary tumors than control animals, with this difference continuing throughout the entire 91-day exposure period.
This study suggests yes - rats exposed to 50 Hz magnetic fields for 24 hours daily developed mammary tumors at a 50% higher rate than unexposed rats over a three-month period.
This research indicates power line frequencies (50 Hz) at 100 microtesla can promote mammary tumor development and increase tumor size, suggesting potential risks to breast tissue from chronic exposure to these common frequencies.