A meta-analysis of in vitro exposures to weak radiofrequency radiation exposure from mobile phones (1990- 2015)

Environmental Research. · 2020 · Mixed · Moderate evidence

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MixedModerate evidencePaper 1570

Study snapshot

PublicationEnvironmental Research. · 2020

Study typemeta_analysis

Reported directionMixed

Evidence ratingModerate

Abstract

A meta-analysis of in vitro exposures to weak radiofrequency radiation exposure from mobile phones (1990- 2015) Halgamuge MN, Skafida E, Davis D. A meta-analysis of in vitro exposures to weak radiofrequency radiation exposure from mobile phones (1990-2015). Environmental Research. Available online 13 February 2020, 109227. doi.org. Highlights • Address the question of the impact of radiofrequency radiation on living organisms in vitro studies using abstract data from 300 peer-reviewed scientific publications (1990-2015) describing 1127 experimental observations. • Establish impacts of the cumulative effect as measured by SAR * exposure time) to estimate the cumulative energy absorption of RF exposure for their analysis. • Observe that more mature lymphocytes and glial cells are less reactive to RF, while less mature and less differentiated cells such as epithelium and spermatozoa are more sensitive to RF. • Observe human cells are less affected by the radiofrequency radiation than rat/mouse cells. Abstract To function, mobile phone systems require transmitters that emit and receive radiofrequency signals over an extended geographical area exposing humans in all stages of development ranging from in-utero, early childhood, adolescents and adults. This study evaluates the question of the impact of radiofrequency radiation on living organisms in vitro studies. In this study, we abstract data from 300 peer-reviewed scientific publications (1990-2015) describing 1127 experimental observations in cell-based in vitro models. Our first analysis of these data found that out of 746 human cell experiments, 45.3% indicated cell changes, whereas 54.7% indicated no changes (p<0.001). Realizing that there are profound distinctions between cell types in terms of age, rate of proliferation and apoptosis, and other characteristics and that RF signals can be characterized in terms of polarity, information content, frequency, Specific Absorption Rate (SAR) and power, we further refined our analysis to determine if there were some distinct properties of negative and positive findings associated with these specific characteristics. We further analyzed the data taking into account the cumulative effect (SAR exposure time) to acquire the cumulative energy absorption of experiments due to radiofrequency exposure, which we believe, has not been fully considered previously. When the frequency of signals, length and type of exposure, and maturity, rate of growth (doubling time), apoptosis and other properties of individual cell types are considered, our results identify a number of potential non-thermal effects of radiofrequency fields that are restricted to a subset of specific faster-growing less differentiated cell types such as human spermatozoa (based on 19 reported experiments, p-value 0.002) and human epithelial cells (based on 89 reported experiments, p- value 0.0001). In contrast, for mature, differentiated adult cells of Glia (p 0.001) and Glioblastoma (p 0.0001) and adult human blood lymphocytes (p 0.0001) there are no statistically significant differences for these more slowly reproducing cell lines. Thus, we show that RF induces significant changes in human cells (45.3%), and in faster-growing rat/mouse cell dataset (47.3%). In parallel with this finding, further analysis of faster-growing cells from other species (chicken, rabbit, pig, frog, snail) indicates that most undergo significant changes (74.4%) when exposed to RF. This study confirms observations from the REFLEX project, Belyaev and others that cellular response varies with signal properties. We concur that differentiation of cell type thus constitutes a critical piece of information and should be useful as a reference for many researchers planning additional studies. Sponsorship bias is also a factor that we did not take into account in this analysis. Conclusion In this review, we perform a meta-analysis of data from 300 peer-reviewed scientific publications (1990-2015) with 1127 in vitro experimental observations carried out in the literature that discussed using different experimental techniques (cytogenetic, gene and protein expression analysis) and different cell types (cultured rodent, human cells and human blood lymphocytes) due to non-thermal radio-frequency electromagnetic exposure. In this paper, we directly differentiated the cumulative effect (SAR exposure time) to acquire the cumulative energy absorption of experiments due to RF exposure, which we believe, has not been fully considered previously. Several studies have reported, based on different experimental techniques that RF exposures comparable to those of a mobile phone induce a range of genetic and other damage including (cytogenetic, gene, and protein expression analysis). Non-thermal radiofrequency electromagnetic exposure in a range of cells/tissues that may not be associated with potentially harmful health consequences; in contrast, other studies have reported no apparent effects related to radiofrequency radiation. Our observation showed that 45.3% experiments concluded that an increase in such potential effects on cells exposed to radiofrequency radiation, while 54.7% showed no such effects (p = 0.001). Specific subtypes of cells show a much clearer cellular response. When radiofrequency, exposure and individual cell types are considered, potential non-thermal effects of radio-frequency radiation on cell types, such as human spermatozoa (based on 19 reported experiments, p-value = 0.002) and human epithelial cells (based on 89 reported experiments, p-value < 0.0001) may exist whereas for Glia (p = 0.001), Glioblastoma (p < 0.0001) and human blood lymphocytes (p < 0.0001) the evidence suggests that there are no statistically significant differences. Fundamentally the validity of any exercise such as this depends on whether studies are carried out with parallel methods and levels of quality assurance and quality control for the biological materials that are employed. The widely varying results we report here could well reflect failures of scientific rigor and consistency, as Portelli and Barnes (2013) [9] have suggested plague in vitro studies. Despite the lack of uniformity in responses, certain patterns are evident. It appears that more mature lymphocytes and glial cells are less reactive to RF, while less mature and less differentiated cells such as epithelium and spermatozoa are more sensitive to RF. In addition, it appears that frequencies that are higher and pulsed have more biological impact than those that are continuous and of lower frequency. A simple glance at our findings could imply that human cells are less affected by the radiofrequency radiation than rat/mouse cells. However, due to the inconsistency of results, it may be safer to look at other possible explanation. One possibility is that the experimental procedure is not consistently followed throughout the majority of these studies, or it could be due to the experimental design guidelines not being able to account for all the variables we may or may not be aware of. Consequently, it allows an inconsistency set of results due to small fluctuation in different studies. Nevertheless, this study should be useful as a reference for many researchers supporting epidemiological studies and in vivo experiments using whole organism animal models. sciencedirect.com

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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 typemeta_analysis

Effect directionmixed

Populationin vitro cell models (human and animal cells)

Sample size1127

ExposureRF

Evidence strengthModerateConfidence: 70% · Peer reviewed: yes

Main findings

The meta-analysis of 1127 in vitro experiments found that 45.3% of human cell studies showed cell changes due to RF exposure, with more sensitive effects in less mature and less differentiated cells such as human spermatozoa and epithelial cells, while mature cells like glia and lymphocytes showed no significant effects. Rat/mouse cells showed a slightly higher response rate. The study highlights variability in results possibly due to methodological inconsistencies and suggests cumulative SAR exposure time as an important factor.

Outcomes measured

cell changes
genetic damage
cytogenetic changes
gene expression changes
protein expression changes

Limitations

Inconsistency and variability in experimental procedures across studies
Potential lack of uniform quality assurance and control
Sponsorship bias not accounted for
Heterogeneity in cell types and experimental conditions

View raw extracted JSON

{
  "study_type": "meta_analysis",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "in vitro cell models (human and animal cells)",
  "sample_size": 1127,
  "outcomes": [
    "cell changes",
    "genetic damage",
    "cytogenetic changes",
    "gene expression changes",
    "protein expression changes"
  ],
  "main_findings": "The meta-analysis of 1127 in vitro experiments found that 45.3% of human cell studies showed cell changes due to RF exposure, with more sensitive effects in less mature and less differentiated cells such as human spermatozoa and epithelial cells, while mature cells like glia and lymphocytes showed no significant effects. Rat/mouse cells showed a slightly higher response rate. The study highlights variability in results possibly due to methodological inconsistencies and suggests cumulative SAR exposure time as an important factor.",
  "effect_direction": "mixed",
  "limitations": [
    "Inconsistency and variability in experimental procedures across studies",
    "Potential lack of uniform quality assurance and control",
    "Sponsorship bias not accounted for",
    "Heterogeneity in cell types and experimental conditions"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.7,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency radiation",
    "in vitro",
    "meta-analysis",
    "mobile phone",
    "cellular effects",
    "non-thermal effects",
    "SAR",
    "cell differentiation"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phone-rf",
      "weight": 0.9,
      "reason": "Study focuses on RF exposure from mobile phones in vitro."
    }
  ]
}

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Identifiers and source

DOI: 10.1016/j.envres.2020.109227
PubMed: Not supplied

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