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Leukemia and brain tumors in Norwegian railway workers, a nested case-control study
T Tynes1, H Jynge, A I Vistnes
1Cancer Registry of Norway, Institute of Epidemiological Cancer Research, Oslo.
American Journal of Epidemiology
|April 1, 1994
Summary
This study found no link between electromagnetic field exposure on Norwegian railways and increased risks of brain tumors or leukemia in male railway workers. The research suggests current exposure levels are not associated with these cancers.
Area of Science:
- Occupational Health
- Epidemiology
- Environmental Health
Background:
- Concerns exist regarding potential health risks, specifically cancer, associated with occupational exposure to electromagnetic fields (EMF).
- Previous research on EMF exposure and cancer incidence has yielded mixed results, necessitating further investigation in specific occupational settings.
Purpose of the Study:
- To investigate whether exposure to electromagnetic fields (EMF) in Norwegian railway workers is associated with an increased risk of developing brain tumors or leukemia.
- To evaluate the relationship between specific EMF exposure levels and the incidence of these cancers within a defined cohort.
Main Methods:
- A nested case-control study was conducted using a cohort of 13,030 male Norwegian railway workers (1958-1990).
- Cases included 39 men with brain tumors and 52 with leukemia, matched with controls from the same cohort.
- Exposure assessment involved cumulative electric and magnetic field measurements, with adjustments for confounders like smoking and chemical exposures.
Main Results:
- The odds ratio for leukemia among workers on electric railways was 0.70 (adjusted for smoking), and for brain tumors was 0.87, compared to non-electric railways.
- No statistically significant trends were observed concerning exposure to either magnetic or electric fields.
- The findings indicate no support for an association between 16 2/3-Hertz electric or magnetic field exposure and leukemia or brain tumor risk.
Conclusions:
- This study does not support a link between occupational exposure to 16 2/3-Hertz electric or magnetic fields and an elevated risk of leukemia or brain tumors in Norwegian railway workers.
- The results suggest that EMF exposure levels encountered in this railway worker cohort are unlikely to be carcinogenic.
- Further research may explore other EMF frequencies or different occupational groups if concerns persist.