Lymphoma development in mice chronically exposed to UMTS-modulated radiofrequency electromagnetic fields.

Radiation research · 2007 · No effect · Moderate evidence

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No effectModerate evidencePaper 5049

Chronically exposed mice (UMTS-modulated RF, 0.4 W/kg SAR) did not differ from sham-exposed mice in number of ill animals, mean survival time, or disease severity. Cage controls had a significantly lower growth rate than animals kept in the exposure systems.

Study snapshot

PublicationRadiation research · 2007

Study typeanimal

Reported directionNo effect

Evidence ratingModerate

Abstract

There are public concerns regarding possible carcinogenic or cancer-promoting effects of electromagnetic fields (EMFs) from mobile phones and base stations. The objective of the present study was to investigate whether chronic exposure to EMFs of the UMTS (Universal Mobile Telecommunication System) influences the development of lymphoma in a lymphoma animal model, the AKR/J mouse. Unrestrained mice were chronically sham-exposed (n = 160) or exposed (n = 160) in identical exposure systems (radial waveguides) to a generic UMTS test signal (24 h per day, 7 days per week, 0.4 W/kg SAR). Additionally, 30 animals were kept as cage controls. Animals were checked visually each day and were weighed and palpated weekly to detect swollen lymph nodes. Starting at the age of 6 months, blood samples were taken from the tail every 2 weeks to perform differential leukocyte counts and to measure the hematocrit. Visibly diseased animals or those older than 43 weeks were killed humanely, and tissue slices were examined for metastatic infiltrations and lymphoma type. The study was performed in a blinded way. Cage control animals had a significantly lower growth rate than those kept in the radial waveguides. The number of ill animals, the mean survival time, and the severity code of the disease did not differ between the experimental groups. Therefore, the data show no negative effects from exposure and corroborate earlier findings in AKR/J mice exposed to GSM EMF (Sommer et al., BMC Cancer 4, 77-90, 2004).

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 typeanimal

Effect directionno_effect

PopulationAKR/J mice (lymphoma animal model)

Sample size350

ExposureRF · 0.4 W/kg · 24 h/day, 7 days/week (chronic); animals followed until visibly diseased or >43 weeks old

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Lymphoma development (number of ill animals)
Mean survival time
Disease severity code
Swollen lymph nodes (palpation)
Differential leukocyte counts
Hematocrit
Metastatic infiltrations and lymphoma type (histology)
Growth rate

Limitations

Frequency of the UMTS test signal not stated in abstract
Cage controls differed in growth rate from animals housed in radial waveguides, suggesting housing/system effects separate from RF exposure

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone/base station (UMTS test signal)",
    "frequency_mhz": null,
    "sar_wkg": 0.4,
    "duration": "24 h/day, 7 days/week (chronic); animals followed until visibly diseased or >43 weeks old"
  },
  "population": "AKR/J mice (lymphoma animal model)",
  "sample_size": 350,
  "outcomes": [
    "Lymphoma development (number of ill animals)",
    "Mean survival time",
    "Disease severity code",
    "Swollen lymph nodes (palpation)",
    "Differential leukocyte counts",
    "Hematocrit",
    "Metastatic infiltrations and lymphoma type (histology)",
    "Growth rate"
  ],
  "main_findings": "Chronically exposed mice (UMTS-modulated RF, 0.4 W/kg SAR) did not differ from sham-exposed mice in number of ill animals, mean survival time, or disease severity. Cage controls had a significantly lower growth rate than animals kept in the exposure systems.",
  "effect_direction": "no_effect",
  "limitations": [
    "Frequency of the UMTS test signal not stated in abstract",
    "Cage controls differed in growth rate from animals housed in radial waveguides, suggesting housing/system effects separate from RF exposure"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "UMTS",
    "radiofrequency electromagnetic fields",
    "RF-EMF",
    "SAR",
    "AKR/J mouse",
    "lymphoma",
    "carcinogenicity",
    "chronic exposure",
    "mobile phones",
    "base stations",
    "blinded study"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.35,
      "reason": "Animal carcinogenicity-type study relevant to RF health risk assessments often considered in WHO/ICNIRP evaluations."
    }
  ]
}

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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: 10.1667/rr0857.1
PubMed: 17723000

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