Posts Tagged ‘gliomas’

LINKS BETWEEN RF AND EMF AND BRAIN CANCERS. JORMA JYRKKANEN RESEARCHER 2025-03-25

October 17, 2025

LINKS BETWEEN RF AND EMF AND BRAIN CANCERS. JORMA JYRKKANEN RESEARCHER 2025-03-25

Key Points

  • Research suggests a possible link between long-term exposure to electromagnetic fields (EMF) and radiofrequency (RF) radiation from cell towers and increased risk of brain cancers and Schwannomas, but evidence is not conclusive.
  • The International Agency for Research on Cancer (IARC) classifies RF radiation as “possibly carcinogenic to humans,” highlighting ongoing controversy.
  • Studies show mixed results, with some finding small increases in certain tumors, especially in animal studies, while human studies often show no clear association.
  • Avoidance guidelines include reducing call time, using speaker mode or headphones, and maintaining distance from cell towers, though effectiveness varies.

Overview

The connection between EMF, RF, and cell tower frequencies and brain cancers like gliomas and Schwannomas (tumors of nerve cells, including acoustic neuromas) is a complex and debated topic. While some studies suggest potential risks, especially with long-term exposure, the evidence is not definitive, and expert opinions differ.

Current Research Findings

Research leans toward a possible association, particularly with heavy, long-term use of cell phones and proximity to cell towers. For instance, the National Cancer Institute (NCI) notes stable brain tumor rates despite increased cell phone use, but animal studies, like those by the National Toxicology Program (NTP), found small increases in heart Schwannomas in male rats exposed to RF radiation (Cell Phones and Cancer Risk Fact Sheet – NCI). The IARC’s 2011 classification of RF as “possibly carcinogenic” reflects limited evidence, fueling ongoing debate.

Types of Cancers and Tumors

Brain cancers, such as gliomas, and Schwannomas, particularly acoustic neuromas, are of concern. Some studies, like the Interphone study, found a small increase in glioma risk for heavy cell phone users, while others, like the Danish Cohort, found no association. Schwannomas, linked to nerve cells, showed increased risk in animal studies but inconsistent results in humans.

Avoidance Guidelines

To minimize exposure, experts suggest reducing call duration, using speaker mode or wired headphones, avoiding calls in areas with weak signals (which increase emission), and maintaining distance from cell towers. The Food and Drug Administration (FDA) recommends these measures, though their impact on reducing cancer risk is not fully proven (Reducing Radio Frequency Exposure from Cell Phones – FDA).

Survey Note: Detailed Analysis of EMF, RF, and Cell Tower Frequencies Linked to Brain Cancers and Schwannomas, Including Avoidance Guidelines

This note provides a comprehensive overview of the relationship between electromagnetic fields (EMF), radiofrequency (RF) radiation, and cell tower frequencies with brain cancers and Schwannomas, including detailed findings from recent studies and practical avoidance guidelines. The analysis is grounded in current scientific literature, with a focus on clarity for a lay audience while maintaining technical accuracy.

Introduction

EMF and RF radiation are forms of non-ionizing electromagnetic radiation emitted by cell towers, cell phones, and other wireless devices. Cell towers operate at frequencies typically ranging from 700 MHz to 2.7 GHz for 2G, 3G, and 4G, and up to 80 GHz for 5G, as noted by the NCI (Cell Phones and Cancer Risk Fact Sheet – NCI). Concerns arise about potential links to brain cancers (e.g., gliomas, meningiomas) and Schwannomas, which are tumors of Schwann cells, often manifesting as acoustic neuromas. This note synthesizes findings from epidemiological, animal, and expert reviews, acknowledging the complexity and controversy surrounding the topic.

Scientific Evidence and Findings

Epidemiological Studies in Humans

Human studies provide mixed results, with no definitive link established. The NCI’s fact sheet, updated in April 2024, indicates stable incidence rates for adult gliomas, pediatric brain tumors, and acoustic neuromas in the US and other regions, despite increased cell phone use (Cell Phones and Cancer Risk Fact Sheet – NCI). Key studies include:

Animal Studies

Animal studies provide some evidence of potential risks, particularly for Schwannomas. The NTP and Ramazzini Institute found small increases in heart Schwannomas in male rats exposed to RF radiation at 3, 6, or 9 watts per kilogram for 18 hours daily, but these findings are limited by species differences and rarity in humans. The NCI notes these results raise questions but do not conclusively link to human brain cancers (Cell Phones and Cancer Risk Fact Sheet – NCI). Another study on 1800 MHz RF-EMF exposure showed inhibited neurite outgrowth in embryonic neural stem cells at 4 W/kg for 3 days, suggesting potential developmental impacts (Exposure to 1800 MHz radiofrequency radiation impairs neurite outgrowth of embryonic neural stem cells | Scientific Reports).

Occupational and Environmental Exposures

For workers with high RF exposure, such as Navy electronics technicians, some studies suggest increased risks of non-lymphocytic leukemia and brain cancer, but results are inconsistent. The NCI’s fact sheet on EMF and cancer notes early studies (1980s–1990s) reported higher cancer rates in electrical occupations, but recent studies with exposure measurements generally show no increased risk (Electromagnetic Fields and Cancer – NCI). Children living near power lines with exposures ≥0.3–0.4 μT showed a 1.4–1.7-fold increased risk of leukemia in pooled analyses, affecting a small percentage (<3%) of children, but mechanisms remain unclear (Electromagnetic Fields and Cancer – NCI).

Expert Opinions and Classifications

The IARC classified RF radiation as “possibly carcinogenic to humans” (Group 2B) in 2011, based on limited evidence from human and animal studies, reflecting ongoing controversy (Cell Phones and Cancer Risk Fact Sheet – NCI). The American Cancer Society, NIEHS, FDA, CDC, FCC, and European Commission (2015) generally conclude no definitive evidence of harm, with calls for more research. The European Commission found no increased brain tumor risk from RF exposure but noted an open question for acoustic neuroma (Electromagnetic Fields and Cancer – NCI).

Frequency Bands and Exposure Levels

Cell towers emit RF in bands like 850 MHz, 1900 MHz, and higher for 5G, with exposure measured by Specific Absorption Rate (SAR), typically below 0.1 W/kg in studies, far below thermal effect thresholds. The FCC provides SAR data for devices, and the NCI notes exposures are generally within safety limits (Cell Phones and Cancer Risk Fact Sheet – NCI).

Avoidance Guidelines

Given the uncertainty, several practical measures can reduce exposure, though their effectiveness in preventing cancer is not proven:

  • Reduce Call Time: Limit duration of calls, especially long conversations.
  • Use Speaker Mode or Headphones: Use wired headphones or speaker mode to increase distance from the head.
  • Avoid Calls in Weak Signal Areas: Weak signals increase emission power, so prefer texting or waiting for stronger signals.
  • Maintain Distance from Cell Towers: Avoid prolonged proximity to cell towers, though residential exposure is typically low.
  • Check SAR Levels: Look up device SAR values via the FCC’s ID search (Specific Absorption Rate (SAR) for Cellular Telephones – FCC).
  • Educate on Children’s Use: Given theoretical vulnerability, limit children’s cell phone use, though studies show no increased risk.

The FDA recommends these measures, emphasizing precautionary approaches (Reducing Radio Frequency Exposure from Cell Phones – FDA).

Summary Table of Key Studies

Study TypeFindingsReference
Interphone StudySmall increase in glioma risk for heaviest users, increased acoustic neuroma risk for 10+ years use[Mobile phone use, exposure to radiofrequency electromagnetic field, and brain tumour: a case–control study
Danish Cohort StudyNo association with glioma, meningioma, or acoustic neuromaCell Phones and Cancer Risk Fact Sheet – NCI
NTP Animal StudySmall increase in heart Schwannomas in male ratsCell Phones and Cancer Risk Fact Sheet – NCI
Children Near Power Lines1.4–1.7-fold increased leukemia risk at ≥0.3–0.4 μT, affecting <3%Electromagnetic Fields and Cancer – NCI
COSMOS StudyNo association with glioma, meningioma, or acoustic neuroma, 7+ years follow-upCell Phones and Cancer Risk Fact Sheet – NCI

Conclusion

The evidence suggests a possible link between long-term EMF/RF exposure and brain cancers/Schwannomas, but it is not conclusive, with significant controversy. Human studies often show no clear association, while animal studies and some occupational data raise concerns. This may be due to differential synergist like viral exposures exposure histories alone [J. Jyrkkanen 2025, comm.]. Avoidance guidelines offer precautionary measures, though their impact on cancer risk reduction is uncertain. Given the 2025 context, ongoing research, such as the COSMOS study, continues to monitor long-term effects, emphasizing the need for balanced public health approaches.

Key Citations

Excluded Oversights

My review of 3 Hydro Utilities Databases on cancer

EMF and Cancer. Analysis of Bibliographies of 3 Major Utilities

Lennart Hardels critical review of regulatory agency conflicts of interest.

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