Non-thermal effects of radiofrequency electromagnetic fields

2020 · Mixed · Low evidence

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MixedLow evidencePaper 1760

Study snapshot

Publicationmanual · 2020

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

Non-thermal effects of radiofrequency electromagnetic fields Peter Wust, Benedikt Kortüm, Ulf Strauss, Jacek Nadobny, Sebastian Zschaeck, Marcus Beck, Ulrike Stein, Pirus Ghadjar. Non-thermal effects of radiofrequency electromagnetic fields. Sci Rep. 2020 Aug 10;10(1):13488. doi: 10.1038/s41598-020-69561-3. Abstract We explored the non-thermal effects of radiofrequency (RF) electromagnetic fields and established a theoretical framework to elucidate their electrophysiological mechanisms. In experiments, we used a preclinical treatment device to treat the human colon cancer cell lines HT-29 and SW480 with either water bath heating (WB-HT) or 13.56 MHz RF hyperthermia (RF-HT) at 42 °C for 60 min and analyzed the proliferation and clonogenicity. We elaborated an electrical model for cell membranes and ion channels and estimated the resulting ion fluxes. The results showed that, for both cell lines, using RF-HT significantly reduced proliferation and clonogenicity compared to WB-HT. According to our model, the RF electric field component was rectified and smoothed in the direction of the channel, which resulted in a DC voltage of ~ 1 µV. This may induce ion fluxes that can potentially cause relevant disequilibrium of most ions. Therefore, RF-HT creates additional non-thermal effects in association with significant ion fluxes. Increasing the understanding of these effects can help improve cancer therapy. Open access paper: ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionmixed

PopulationHuman colon cancer cell lines (HT-29, SW480)

Sample sizeNot supplied

ExposureRF · 13.56 MHz · 60 min

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Human colon cancer cell lines (HT-29 and SW480) treated with 13.56 MHz RF hyperthermia at 42 °C for 60 min showed significantly reduced proliferation and clonogenicity compared with water bath heating at the same temperature and duration. An electrical model suggested rectification/smoothing of the RF electric field component leading to an estimated DC voltage of ~1 µV and potentially relevant ion flux disequilibrium, interpreted as additional non-thermal effects associated with RF hyperthermia.

Outcomes measured

Cell proliferation
Clonogenicity
Modeled membrane/ion channel electrical effects (DC voltage)
Estimated ion fluxes

Limitations

Sample size not reported in abstract
In vitro cell-line study; clinical relevance not established in abstract
Ion flux and DC voltage findings are based on modeling/estimation rather than direct measurement (as described in abstract)
Exposure metric such as SAR not reported in abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "hyperthermia device",
    "frequency_mhz": 13.56,
    "sar_wkg": null,
    "duration": "60 min"
  },
  "population": "Human colon cancer cell lines (HT-29, SW480)",
  "sample_size": null,
  "outcomes": [
    "Cell proliferation",
    "Clonogenicity",
    "Modeled membrane/ion channel electrical effects (DC voltage)",
    "Estimated ion fluxes"
  ],
  "main_findings": "Human colon cancer cell lines (HT-29 and SW480) treated with 13.56 MHz RF hyperthermia at 42 °C for 60 min showed significantly reduced proliferation and clonogenicity compared with water bath heating at the same temperature and duration. An electrical model suggested rectification/smoothing of the RF electric field component leading to an estimated DC voltage of ~1 µV and potentially relevant ion flux disequilibrium, interpreted as additional non-thermal effects associated with RF hyperthermia.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "In vitro cell-line study; clinical relevance not established in abstract",
    "Ion flux and DC voltage findings are based on modeling/estimation rather than direct measurement (as described in abstract)",
    "Exposure metric such as SAR not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency",
    "non-thermal effects",
    "hyperthermia",
    "13.56 MHz",
    "colon cancer",
    "HT-29",
    "SW480",
    "proliferation",
    "clonogenicity",
    "ion channels",
    "ion flux",
    "cell membrane model"
  ],
  "suggested_hubs": [
    {
      "slug": "rf-hyperthermia",
      "weight": 0.9,
      "reason": "Study uses 13.56 MHz RF hyperthermia and compares to water bath heating at matched temperature."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1038/s41598-020-69561-3
PubMed: Not supplied

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