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Study on potential effects of "902-MHz GSM-type Wireless Communication Signals" on DMBA-induced mammary tumours in Sprague-Dawley rats.

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Hruby R, Neubauer G, Kuster N, Frauscher M · 2008

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Rats exposed to cell phone-level radiation showed significantly more malignant tumors, adding to evidence that RF exposure may promote cancer development.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to 902 MHz GSM-type wireless signals (similar to cell phone radiation) for 4 hours daily over 6 months after giving them a chemical known to cause breast cancer. The RF-exposed rats showed statistically significant increases in palpable tissue masses and more malignant tumors compared to sham-exposed controls, though the researchers concluded these differences were likely incidental due to high variability in the cancer model used.

Why This Matters

This study adds to the growing body of research examining whether radiofrequency radiation can promote cancer development. While the authors dismissed their own findings as incidental, the fact remains that rats exposed to cell phone-type radiation showed more malignant tumors than unexposed controls. The exposure levels (0.4-4.0 W/kg SAR) span the range of typical cell phone use, making these results relevant to human exposure scenarios. What's particularly concerning is the pattern we see across multiple animal studies: even when researchers find statistically significant increases in cancer, they often conclude the results are inconclusive due to study limitations. The reality is that no single study provides definitive proof, but the accumulating evidence from animal research consistently points toward biological effects that warrant serious consideration. This study reinforces why precautionary measures make sense, especially given that we're conducting a massive, uncontrolled experiment on human health with wireless technology.

Exposure Details

SAR
0.4, 1.3 or 4 W/kg
Source/Device
902 MHz
Exposure Duration
4h/d, 5d/week, during 6 months

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.4, 1.3 or 4 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 4x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 902 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 902 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of the study was to detect whether long-term exposure to "902-MHz GSM-type Wireless Communication Signals" ("radio-frequency (RF)-exposure") would affect 7,12-dimethylbenz(a)anthracene (DMBA)-induced mammary tumours in female Sprague-Dawley rats.

Five hundred female rats were each given a single oral dose of 17 mg DMBA per kg body weight (bw) at...

There were several statistically significant differences between RF-exposed groups and the sham-expo...

In the context of the results of the cage-control group, in the light of controversial results reported in the literature, and given the fact that the DMBA-mammary tumour model is known to be prone to high variations in the results, it is the authors' opinion that the differences between the groups are rather incidental ones.

Cite This Study
Hruby R, Neubauer G, Kuster N, Frauscher M (2008). Study on potential effects of "902-MHz GSM-type Wireless Communication Signals" on DMBA-induced mammary tumours in Sprague-Dawley rats. Mutat Res. 649(1-2):34-44, 2008.
Show BibTeX
@article{r_2008_study_on_potential_effects_1034,
  author = {Hruby R and Neubauer G and Kuster N and Frauscher M},
  title = {Study on potential effects of "902-MHz GSM-type Wireless Communication Signals" on DMBA-induced mammary tumours in Sprague-Dawley rats.},
  year = {2008},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/17981079/},
}
PubMed: 17981079

Cited By (23 papers)

Quick Questions About This Study

A 2008 study exposed rats to 902 MHz GSM signals for 4 hours daily over 6 months after inducing breast cancer. While RF-exposed rats showed more palpable masses and malignant tumors, researchers concluded these differences were likely incidental due to high variability in the cancer model used.
Research on rats exposed to 902 MHz wireless signals for 4 hours daily found statistically significant increases in tissue masses and malignant tumors compared to controls. However, the study authors attributed these findings to the inherent variability of the breast cancer model rather than radiation effects.
Rats with chemically-induced breast cancer exposed to 902 MHz GSM-type radiation showed more palpable tissue masses and malignant tumors than unexposed controls. The 2008 study found these differences statistically significant but concluded they were likely coincidental due to the cancer model's known variability.
The 2008 Hruby study found no clear dose-response relationship between 902 MHz GSM radiation exposure and tumor development in rats. Despite statistically significant differences between exposure groups, the lack of dose-response patterns suggested the findings were incidental rather than causally related to radiation.
The 2008 study using Sprague-Dawley rats with DMBA-induced breast cancer found the model prone to high variability in results. Researchers noted that cage-control animals often showed stronger tumor responses than radiation-exposed groups, questioning the model's reliability for EMF cancer research.