L. Alfredsson et al., CANCER INCIDENCE AMONG MALE RAILWAY ENGINE-DRIVERS AND CONDUCTORS IN SWEDEN, 1976-90, CCC. Cancer causes & control, 7(3), 1996, pp. 377-381
During recent years, the relationship between exposure to magnetic fie
lds and cancer has attracted increasing interest. In Sweden, train per
sonnel are exposed to comparatively strong magnetic fields in their wo
rk. The aim of the present study was to investigate cancer incidence,
particularly leukemia and brain tumors, among male railway engine driv
ers and conductors, respectively, and to compare their cancer incidenc
e with that of the general male population. The study population compr
ised all male railway engine drivers (n = 7,466) and conductors (n = 2
,272) who were ever employed at the Swedish State Railways during the
period 1976-90. The study population was observed with regard to cance
r incidence by means of the National Cancer Register for the period 19
76-90. The total cancer incidence (all tumors included) among railway
engine drivers was lower than in the general Swedish population. An in
creased incidence of lymphocytic leukemia was observed among railway e
ngine drivers and conductors combined (relative risk = 2.3; 95 percent
confidence interval = 1.3-3.2), with the same point estimate for both
occupational groups. For brain tumor (astrocytoma), the observed rela
tive risk was close to one. The study provides evidence of an excess r
isk of lymphocytic leukemia in railway engine drivers and conductors,
workers with known occupational exposure to magnetic fields.