Study type: Epidemiological study (observational study)

Occupational and environmental risk factors for brain cancer: a pilot case-control study in France. epidem.

Published in: Presse Med 2010; 39 (2): e35-e44

Aim of study (acc. to author)

A pilot case-control study was conducted in the southeastern part of France to investigate occupational and environmental risk factors for brain cancer.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 cell phone use: none
Group 2 cell phone use: < 4 hour-years
Group 3 cell phone use: 4 - 36 hour-years
Group 4 cell phone use: > 36 hour-years
Reference group 5 leisure work with a computer in the past 5 years: none
Group 6 leisure work with a computer in the past 5 years: < 5 h/week
Group 7 leisure work with a computer in the past 5 years: ≥ 5 h/week
Reference group 8 occupational work with a computer in the past 5 years: none
Group 9 occupational work with a computer in the past 5 years: < 4 h/week
Group 10 occupational work with a computer in the past 5 years: ≥ 4 h/week
Group 11 occupational exposure to electromagnetic fields
Group 12 occupational exposure to microwave frequency
Group 13 residence in a distance of < 500 m to power lines
Group 14 resicence in a distance of < 500 m to cell phone towers

Population

Case group

Control group

Study size

Cases Controls
Eligible 162 -
Participants 122 122
Statistical analysis method: (adjustment: )

Conclusion (acc. to author)

No association was found between cellular phone use and brain tumor. The exposure to extremely low frequency electromagnetic fields during the use of computers showed overall no association, only in the subgroup of occupational use less than 4 hours per day a statistically signicant increased risk was observed. Residing in a distance of less than 500 m to cell phone base stations was associated with statistically signicant decreased risk for brain tumor.

Limitations (acc. to author)

The small study sample and recall bias related to having brain tumor could have affected the assessment of the risk factors.

Study funded by

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