PubMed Health⌕ Search

Biomedical subjects

M Feychting

Publications and source records attributed to M Feychting.

42 records · Page 3Linked to original sources
PubMed1994

Magnetic fields, leukemia, and central nervous system tumors in Swedish adults residing near high-voltage power lines.

We conducted a case-control study to test the hypothesis that exposure to magnetic fields of the type generated by high-voltage power lines increases the incidence of leukemia and central nervous system tumors in adults. The study was based on people who, between 1960 and 1985, had lived on a property in Sweden located within 300 meters of 220 or 400 kilovolt power lines. We identified a total of 325 leukemia cases and 223 cases of central nervous system tumor. Two matched controls per case were selected at random. We assessed exposure by spot measurements and by calculations of the magnetic fields generated by the power lines. For calculated magnetic field levels of 0.2 microT or more closest in time to diagnosis, we found an elevated relative risk (RR) for acute myeloid leukemia [RR = 1.7; 95% confidence interval (CI) = 0.8-3.5] and chronic myeloid leukemia [RR = 1.7; 95% CI = 0.7-3.8]. Using cumulative exposure for the 15 years preceding diagnosis, we found relative risk estimates for acute and chronic myeloid leukemia of 2.3 (95% CI = 1.0-4.6) and 2.1 (95% CI = 0.9-4.7), respectively, for the highest exposure category. For chronic lymphatic leukemia and for central nervous system tumors, relative risk estimates were close to or below unity.

Adult↗
PubMed1993

Magnetic fields and cancer in children residing near Swedish high-voltage power lines.

A case-control study was conducted to test the hypothesis that exposure to magnetic fields of the type generated by high-voltage power lines increases cancer incidence in children. The study base consisted of everyone under age 16 years who had lived on a property located within 300 meters of any of the 220 and 400 kV power lines in Sweden during the period 1960-1985. Subjects were followed from their entry into the study base through 1985. A total of 142 cancer cases were identified through a record linkage to the Swedish Cancer Registry. There were 39 leukemia and 33 central nervous system tumor cases. A total of 558 controls were selected at random from the study base. Exposure was assessed by spot measurements and by calculations of the magnetic fields generated by the power lines, taking distance, line configuration, and load into account. Information about historical loads on the power lines was used to calculate the magnetic fields for the year closest in time to diagnosis. When historical calculations were used as exposure assessment for childhood leukemia with cutoff points at 0.1 and 0.2 microtesla (microT), the estimated relative risk increased over the two exposure levels and was estimated at 2.7 (95% confidence interval (CI) 1.0-6.3) for 0.2 microT and over; p for trend = 0.02. When the upper cutoff point was shifted to 0.3 microT, the relative risk was 3.8 (95% CI 1.4-9.3); p for trend = 0.005. These results persisted when adjustment for potential confounding factors was made. For central nervous system tumor, lymphoma, and all childhood cancers combined, there was no support for an association.

Adolescent↗
PubMed1988

Diet, tobacco and urothelial cancer. A 14-year follow-up of 16,477 subjects.

Urothelial cancer has been linked with tobacco, phenacetin-containing analgesics and some industrially-related carcinogens. Carotene has been suggested as reducing the risk of urothelial cancer but there is not much information on the relation between diet and the incidence of human urothelial cancer. Furthermore, the magnitude of the risk of urothelial cancer for pipe smokers remains unclear. In a 14-year follow-up of 16,477 Swedish twins the rate ratio of urothelial cancer (with 95% confidence interval) for subjects with a moderate/high intake of pork and beef respectively was 1.6 (1.0-2.7) and 1.6 (1.0-2.6). Meat consumption is widespread in Western populations. If the finding is supported by further data, a possible etiologic factor associated with the consumption of beef and pork would account for a substantial proportion of the cases of urothelial cancer. The rate ratio for men smoking a pipe/cigars, but not cigarettes, was 3.3 (95% confidence interval 1.5-7.4).

Cohort Studies↗