A critical analysis of the MOBI-Kids study of wireless phone use in childhood and adolescence and brain tumor risk
Abstract
A critical analysis of the MOBI-Kids study of wireless phone use in childhood and adolescence and brain tumor risk Lennart Hardell, Joel M. Moskowitz. A critical analysis of the MOBI-Kids study of wireless phone use in childhood and adolescence and brain tumor risk. Reviews on Environmental Health, May 5, 2022. doi.org. Abstract The MOBI-Kids case-control study on wireless phone use and brain tumor risk in childhood and adolescence included the age group 10–24 years diagnosed between 2010 and 2015. Overall no increased risk was found although for brain tumors in the temporal region an increased risk was found in the age groups 10–14 and 20– 24 years. Most odds ratios (ORs) in MOBI-Kids were <1.0, some statistically significant, suggestive of a preventive effect from RF radiation; however, this is in contrast to current knowledge about radiofrequency (RF) carcinogenesis. The MOBI-Kids results are not biologically plausible and indicate that the study was flawed due to methodological problems. For example, not all brain tumor cases were included since central localization was excluded. Instead, all brain tumor cases should have been included regardless of histopathology and anatomical localization. Only surgical controls with appendicitis were used instead of population-based controls from the same geographical area as for the cases. In fact, increased incidence of appendicitis has been postulated to be associated with RF radiation which makes selection of control group in MOBI-Kids questionable. Start of wireless phone use up to 10 years before diagnosis was in some analyses included in the unexposed group. Thus, any important results demonstrating late carcinogenesis, a promoter effect, have been omitted from analysis and may underestimate true risks. Linear trend was in some analyses statistically significant in the calculation of RF- specific energy and extremely low frequency (ELF)-induced current in the center of gravity of the tumor. Additional case-case analysis should have been performed. The data from this study should be reanalyzed using unconditional regression analysis adjusted for potential confounding factors to increase statistical power. Then all responding cases and controls could be included in the analyses. In sum, we believe the results as reported in this paper seem uninterpretable and should be dismissed. Summary • In our opinion, the results as reported in the MOBI-Kids paper seem uninterpretable and should be dismissed. • All brain tumor cases should have been included regardless of histopathology and anatomical localization. • Only surgical controls with suspected appendicitis were used. Yet, increased incidence of appendicitis has been postulated to be associated with RF radiation. • Start of wireless phone use up to 10 years before diagnosis was in some analyses included in the unexposed group. This would bias the ORs towards unity. • The results indicate an increased risk for tumors in the temporal brain region in spite of methodological issues based on low numbers in several categories. • Linear trend was in some analyses statistically significant in the calculation of RF-specific energy and ELF- induced current in the center of gravity of the tumor. Additional case-case analysis should have been performed. • The data from this study should be reanalyzed using unconditional regression analysis adjusted for potential confounding factors to increase the statistical power. Finally, it is unfortunate that after such a major investment of resources that little can be learned at this time from the MOBI-Kids study about the risk of brain tumors from wireless phone use in young people. Since the study addresses an issue critical to public health and the majority of the funding was from the European Commission, the MOBI-Kids data set should be publicly archived making it available to the scientific community to enable the data to be re-analyzed using different assumptions and methods. Open access paper: degruyter.com
AI evidence extraction
Main findings
This critical analysis reports that the MOBI-Kids case-control study overall found no increased brain tumor risk with wireless phone use, but reported increased risk for tumors in the temporal region in ages 10–14 and 20–24 years. The authors argue many odds ratios <1.0 are not biologically plausible and attribute the results to methodological problems (case selection, control selection, and exposure misclassification), concluding the reported results are uninterpretable and should be dismissed.
Outcomes measured
- Brain tumor risk
- Brain tumors in the temporal brain region
- RF-specific energy (tumor center of gravity) trend
- ELF-induced current (tumor center of gravity) trend
Limitations
- This is a critical commentary/analysis rather than a primary epidemiologic study.
- No quantitative effect estimates or sample sizes are provided in the abstract.
- Conclusions rely on the authors' interpretation of methodological flaws in the MOBI-Kids study rather than new analyses presented in the abstract.
- Specific details of the proposed reanalysis (variables, confounders, model specifications) are not provided in the abstract.
Suggested hubs
-
cell-phones
(0.95) Focuses on wireless/mobile phone use and brain tumor risk in young people.
View raw extracted JSON
{
"publication_year": null,
"study_type": "review",
"exposure": {
"band": "RF",
"source": "wireless phone",
"frequency_mhz": null,
"sar_wkg": null,
"duration": "Start of wireless phone use up to 10 years before diagnosis discussed in relation to exposure classification"
},
"population": "Children, adolescents, and young adults (ages 10–24 years) in the MOBI-Kids case-control study; diagnosed 2010–2015",
"sample_size": null,
"outcomes": [
"Brain tumor risk",
"Brain tumors in the temporal brain region",
"RF-specific energy (tumor center of gravity) trend",
"ELF-induced current (tumor center of gravity) trend"
],
"main_findings": "This critical analysis reports that the MOBI-Kids case-control study overall found no increased brain tumor risk with wireless phone use, but reported increased risk for tumors in the temporal region in ages 10–14 and 20–24 years. The authors argue many odds ratios <1.0 are not biologically plausible and attribute the results to methodological problems (case selection, control selection, and exposure misclassification), concluding the reported results are uninterpretable and should be dismissed.",
"effect_direction": "mixed",
"limitations": [
"This is a critical commentary/analysis rather than a primary epidemiologic study.",
"No quantitative effect estimates or sample sizes are provided in the abstract.",
"Conclusions rely on the authors' interpretation of methodological flaws in the MOBI-Kids study rather than new analyses presented in the abstract.",
"Specific details of the proposed reanalysis (variables, confounders, model specifications) are not provided in the abstract."
],
"evidence_strength": "low",
"confidence": 0.7399999999999999911182158029987476766109466552734375,
"peer_reviewed_likely": "yes",
"stance": "concern",
"stance_confidence": 0.6999999999999999555910790149937383830547332763671875,
"summary": "This paper provides a critical analysis of the MOBI-Kids case-control study of wireless phone use and brain tumor risk in ages 10–24 years. It notes MOBI-Kids reported no overall increased risk, but increased risk for temporal-region tumors in some age groups, alongside many odds ratios below 1.0. The authors argue the findings are not biologically plausible and reflect methodological flaws, concluding the reported results are uninterpretable and calling for reanalysis and public archiving of the dataset.",
"key_points": [
"The MOBI-Kids study is described as finding no overall increased brain tumor risk with wireless phone use in ages 10–24 years.",
"An increased risk is reported for tumors in the temporal brain region in ages 10–14 and 20–24 years.",
"The authors highlight that many MOBI-Kids odds ratios were <1.0 and interpret this as inconsistent with current knowledge about RF carcinogenesis.",
"They argue case inclusion was incomplete because some central tumor localizations were excluded.",
"They criticize the use of surgical appendicitis controls rather than population-based controls and note appendicitis has been postulated to be associated with RF exposure.",
"They state exposure misclassification occurred when wireless phone use up to 10 years before diagnosis was included as unexposed in some analyses, potentially biasing results toward unity.",
"They report that some analyses showed statistically significant linear trends for RF-specific energy and ELF-induced current at the tumor center of gravity.",
"They recommend additional analyses (including case-case analysis and unconditional regression adjusted for confounders) and call for public archiving of the MOBI-Kids dataset for reanalysis."
],
"categories": [
"Epidemiology",
"Cancer",
"Mobile Phones",
"RF Exposure",
"Research Methods"
],
"tags": [
"MOBI-Kids",
"Case-Control Study",
"Wireless Phone Use",
"Mobile Phones",
"Radiofrequency Radiation",
"Brain Tumors",
"Temporal Lobe Tumors",
"Exposure Misclassification",
"Control Selection Bias",
"Appendicitis Controls",
"Methodological Critique",
"Reanalysis Recommendation",
"Data Sharing"
],
"keywords": [
"MOBI-Kids",
"wireless phone",
"radiofrequency",
"RF",
"ELF",
"brain tumor",
"temporal region",
"case-control",
"odds ratio",
"methodological problems",
"controls",
"appendicitis"
],
"suggested_hubs": [
{
"slug": "cell-phones",
"weight": 0.9499999999999999555910790149937383830547332763671875,
"reason": "Focuses on wireless/mobile phone use and brain tumor risk in young people."
}
],
"social": {
"tweet": "Critical analysis argues MOBI-Kids (ages 10–24) reported no overall brain tumor risk increase with wireless phone use but signals for temporal-region tumors; authors cite major methodological issues (case/control selection, exposure misclassification) and call results uninterpretable and in need of reanalysis + public data archiving.",
"facebook": "This paper critiques the MOBI-Kids case-control study on wireless phone use and brain tumor risk in ages 10–24. While MOBI-Kids reported no overall increased risk, it reported increased risk for temporal-region tumors in some age groups; the authors argue methodological flaws and exposure misclassification make the findings uninterpretable and call for reanalysis and public archiving of the dataset.",
"linkedin": "A critical review of the MOBI-Kids study (ages 10–24, 2010–2015) notes no overall increased brain tumor risk reported, but increased risk for temporal-region tumors in some age groups. The authors argue methodological problems (case inclusion, appendicitis surgical controls, exposure misclassification) undermine interpretability and recommend reanalysis and public archiving of the dataset."
}
}
AI can be wrong. Always verify against the paper.
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