David Savitz: Microwave News Article Archive (2004 - )

Magnetic fields at levels commonly found in homes, offices and the urban environment have once again been found to increase the risk of pregnancy loss. The latest study —from Kaiser Permanente in Oakland, CA— shows that power-frequency fields can triple the risk of miscarriages.

“This study provides fresh evidence, directly from a human population, that magnetic field exposure in daily life could have adverse health impacts,” De-Kun Li, the lead author of the Kaiser study, told Microwave News. These findings “should bring attention to this potentially important environmental hazard to pregnant women,” Li urges.

There are now at least seven studies linking miscarriages to prenatal exposure to electromagnetic fields, according to Li.

Power-frequency magnetic fields can promote brain tumors, according to the largest epidemiological study of its kind ever undertaken. The study promises to breathe new life into the idea that extremely low frequency (ELF) EMFs are more likely to be cancer promoters than causes of cancer. This hypothesis gained support a generation ago but has lost currency in recent years.

The new results, published online earlier this month by the journal Cancer Epidemiology, Biomarkers & Prevention, come from INTEROCC, an international project with seven participating countries designed to investigate occupational health risks from chemicals and EMFs. The project is directed by Elisabeth Cardis at CREAL in Barcelona with $1.5 million from the U.S. National Institutes of Health (though none of the tumor cases are from the U.S.).

The INTEROCC team found that those who were exposed to elevated EMF exposures at work during the five years prior to diagnosis had significantly higher rates of glioma compared to those who were least exposed during that time on the job. The greater the exposure, the greater the tumor risk.

"Now it is enough!" claims Maria Feychting of Sweden's Karolinska Institute. Feychting wants to stop wasting money on any more epidemiological studies of breast cancer risks from power-frequency electromagnetic fields (ELF EMFs).

"We can be confident that exposure to ELF magnetic fields does not cause breast cancer," she writes in an invited commentary published last week in the influential American Journal of Epidemiology (AJE). Feychting's call to stop research was prompted by a new study of breast cancer among Chinese textile workers from the Fred Hutchinson Cancer Research Center in Seattle, which found no association with ELF magnetic field exposures. Feychting's confidence is based in large part on the exposure assessment used in the textile study, which, she believes, was "better than in previous studies."

If Feychting's call to halt research is heeded, she will have shattered a key driver for EMF–cancer research that has held sway for the last 25 years: the melatonin hypothesis.

De-Kun Li's new study, published yesterday, got quite a bit of news coverage with comments from all over. One of the most surprising, at least to us, was from David Savitz, who some 25 years ago...

The International Commission on Non-Ionizing Radiation Protection (ICNIRP) has released two new reviews on RF radiation: (1) Exposure to High-Frequency Electromagnetic Fields, Biological Effects and Health Consequences (100 kHz-300 GHz), and (2) Epidemiologic Evidence on Mobile Phones and Tumor Risk: A Review."

The first is a 372-page review that addresses all aspects of RF interactions, from dosimetry to in vitro and in vivo experiments to epidemiological studies. It was prepared by the full commission and its advisory committees. The full text of the report is available at no charge from the ICNIRP Web site. Here is the conclusion on the plausibility of non-thermal effects:

Members of each of the teams that have reported links between mobile phones and acoustic neuromas have recently published reviews of the RF epidemiological literature.