Researchers have found that when exposed to such fields, the drug tamoxifen lost its ability to halt the proliferation of cancer cells grown in the laboratory.
Tamoxifen is a synthetic hormone used to prevent the recurrence of breast cancer.
These findings, reported last week at a Washington, D.C., meeting sponsored by the U.S. Public Health Service, also heightened concern that these electromagnetic fields may be triggering hitherto unrecognized biological changes in people.