Non-thermal membrane effects of electromagnetic fields and therapeutic applications in oncology.

Abstract

The temperature-independent effects of electromagnetic fields (EMF) have been controversial for decades. Here, we critically analyze the available literature on non-thermal effects of radiofrequency (RF) and microwave EMF. We present a literature review of preclinical and clinical data on non-thermal antiproliferative effects of various EMF applications, including conventional RF hyperthermia (HT, cRF-HT). Further, we suggest and evaluate plausible biophysical and electrophysiological models to decipher non-thermal antiproliferative membrane effects. Available preclinical and clinical data provide sufficient evidence for the existence of non-thermal antiproliferative effects of exposure to cRF-HT, and in particular, amplitude modulated (AM)-RF-HT. In our model, transmembrane ion channels function like RF rectifiers and low-pass filters. cRF-HT induces ion fluxes and AM-RF-HT additionally promotes membrane vibrations at specific resonance frequencies, which explains the non-thermal antiproliferative membrane effects ion disequilibrium (especially of Ca) and/or resonances causing membrane depolarization, the opening of certain (especially Ca) channels, or even hole formation. AM-RF-HT may be tumor-specific owing to cancer-specific ion channels and because, with increasing malignancy, membrane elasticity parameters may differ from that in normal tissues. Published literature suggests that non-thermal antiproliferative effects of cRF-HT are likely to exist and could present a high potential to improve future treatments in oncology.

AI evidence extraction

Main findings

This review critically analyzes literature on non-thermal effects of RF and microwave EMF, focusing on preclinical and clinical data for non-thermal antiproliferative effects from conventional RF hyperthermia (cRF-HT) and amplitude-modulated RF hyperthermia (AM-RF-HT). The authors state that available preclinical and clinical data provide sufficient evidence for non-thermal antiproliferative effects with cRF-HT, particularly AM-RF-HT, and propose biophysical models involving transmembrane ion channels, ion fluxes (especially Ca), and membrane vibrations/resonances.

Outcomes measured

• Non-thermal antiproliferative effects
• Membrane effects (ion fluxes/ion disequilibrium, membrane depolarization, channel opening, hole formation)
• Potential therapeutic applications in oncology

Limitations

• Frequency, SAR, and exposure duration parameters are not provided in the abstract.
• Conclusions are based on a literature review; specific study designs, effect sizes, and quality assessments are not described in the abstract.
• Mechanistic models are proposed/suggested rather than directly demonstrated in the abstract.

{
    "study_type": "review",
    "exposure": {
        "band": "RF",
        "source": "therapeutic RF hyperthermia (cRF-HT; AM-RF-HT)",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Non-thermal antiproliferative effects",
        "Membrane effects (ion fluxes/ion disequilibrium, membrane depolarization, channel opening, hole formation)",
        "Potential therapeutic applications in oncology"
    ],
    "main_findings": "This review critically analyzes literature on non-thermal effects of RF and microwave EMF, focusing on preclinical and clinical data for non-thermal antiproliferative effects from conventional RF hyperthermia (cRF-HT) and amplitude-modulated RF hyperthermia (AM-RF-HT). The authors state that available preclinical and clinical data provide sufficient evidence for non-thermal antiproliferative effects with cRF-HT, particularly AM-RF-HT, and propose biophysical models involving transmembrane ion channels, ion fluxes (especially Ca), and membrane vibrations/resonances.",
    "effect_direction": "benefit",
    "limitations": [
        "Frequency, SAR, and exposure duration parameters are not provided in the abstract.",
        "Conclusions are based on a literature review; specific study designs, effect sizes, and quality assessments are not described in the abstract.",
        "Mechanistic models are proposed/suggested rather than directly demonstrated in the abstract."
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "non-thermal effects",
        "radiofrequency",
        "microwave",
        "hyperthermia",
        "amplitude modulation",
        "membrane effects",
        "ion channels",
        "calcium",
        "antiproliferative",
        "oncology"
    ],
    "suggested_hubs": []
}

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