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

Cancer & Tumors

Focus formation of C3H/10T1/2 cells and exposure to a 836.55 MHz modulated radiofrequency field.

No Effects Found

Cain CD, Thomas DL, Adey WR · 1997

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Cell phone-like radiation did not promote cancer cell formation in this 28-day laboratory study, but longer-term human effects remain uncertain.

Plain English Summary

Summary written for general audiences

Researchers exposed mouse cells to cell phone-like radiation (836.55 MHz TDMA signals) for 28 days to see if it would enhance cancer cell formation when combined with a known tumor-promoting chemical. The radiation exposure at levels similar to cell phone use did not increase cancer cell formation compared to unexposed cells. This suggests that this type of radiofrequency exposure does not act as a tumor promoter in laboratory cell cultures.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 836.5 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 836.5 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: 836.55 MHz TDMA Duration: 20 min on, 20 min off, 24 h/day for 28 days.

Study Details

We have tested the hypothesis that exposures to radiofrequency (RF) fields using a form of digital modulation (TDMA) and a chemical tumor promoter, 12-O-tetradecanoylphorbol-13-acetate (TPA), are copromoters that enhance focus formation of transformed cells in coculture with parental C3H/10T1/2 murine fibroblasts. RF field exposures did not influence TPA's dose-dependent promotion of focus formation in coculture

Cell cultures were exposed to an 836.55 MHz TDMA-modulated field in TEM transmission line chambers, ...

At 1.5 μW/g, TPA-induced focus formation (at 10, 30, and 50 ng/ml) was not significantly different i...

The findings support a conclusion that repeated exposures to this RF field do not influence tumor promotion in vitro, based on the RF field's inability to enhance TPA-induced focus formation.

Cite This Study
Cain CD, Thomas DL, Adey WR (1997). Focus formation of C3H/10T1/2 cells and exposure to a 836.55 MHz modulated radiofrequency field. Bioelectromagnetics 18(3):237-243, 1997.
Show BibTeX
@article{cd_1997_focus_formation_of_c3h10t12_2962,
  author = {Cain CD and Thomas DL and Adey WR},
  title = {Focus formation of C3H/10T1/2 cells and exposure to a 836.55 MHz modulated radiofrequency field.},
  year = {1997},
  doi = {10.1002/(SICI)1521-186X(1997)18:3%3C237::AID-BEM6%3E3.0.CO;2-3},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/(SICI)1521-186X(1997)18:3%3C237::AID-BEM6%3E3.0.CO;2-3},
}
DOI: 10.1002/(SICI)1521-186X(1997)18:3%3C237::AID-BEM6%3E3.0.CO;2-3

Quick Questions About This Study

No, 836.55 MHz TDMA radiation does not promote cancer cell formation. A 1997 study exposed mouse cells to this specific frequency for 28 days and found no increase in tumor promotion compared to unexposed cells, even when combined with cancer-promoting chemicals.
TDMA cell phone signals at 1.5 μW/g do not enhance tumor growth in laboratory studies. Research using C3H/10T1/2 mouse cells showed no significant difference in cancer cell formation between RF-exposed and unexposed cultures across ten independent experiments.
28-day radiofrequency exposure is not harmful to C3H/10T1/2 mouse cells. The 1997 Cain study found that continuous exposure to 836.55 MHz TDMA signals did not increase cancer cell transformation or alter normal cellular function in laboratory conditions.
Cell phone frequencies do not act as tumor promoters in laboratory cell cultures. Research testing 836.55 MHz TDMA radiation at multiple power levels found no ability to enhance TPA-induced cancer cell formation in mouse cells over 28 days of exposure.
Researchers tested TDMA radiation at 0.15, 1.5, and 15.0 μW/g power levels for cancer effects. None of these exposure levels, which are similar to typical cell phone use, showed any ability to promote tumor formation in laboratory mouse cell cultures.