2000. Between them , the studies investigated any possible association
between the use of wireless phones and prim ary brain cancer, gliom a,
meningiom a, or acoustic neurom a, tumors of the brain or salivary gland,
leukemia, or other cancers. None of the studies dem onstrated t he
existence of any harmful health effects from wireless phones RF
exposures. However, none of the studies can answer questions about
long-term exposures, since the average period of phone use in these
studies was around three years.
W ha t re se ar ch is n ee ded t o de cid e w h et h e r RF e xposu re fr om
w ireless ph one s pose s a he alt h risk?
A com bination of laboratory studies and epidem iological studies of people
actually using wireless phones would provide som e of the data that are
needed. Lifetim e anim al exposure studies could be com plet ed in a few
years. However, very large num bers of anim als would be needed to
provide reliable proof of a cancer prom oting effect if one exists.
Epidemiological studies can provide data that is directly applicable to
human populations, but ten or m ore years' follow-up m ay be needed t o
provide answers about som e health effects, such as cancer. This is
because the interval between the time of exposure to a cancer-causing
agent and t he tim e tum ors develop - if they do - may be m any, m any
years. The interpretation of epidemiological studies is ham pered by
difficulties in measuring actual RF exposure during day- to-day use of
wireless phones. Many factors affect this m easurement, such as the angle
at which the phone is held, or which m odel of phone is used.
W hat is FD A doing to find out m ore a bout t he possible healt h
effect s of w ir ele ss ph one RF?
FDA is working wit h the U.S. National Toxicology Program and with
groups of investigators around the world to ensure that high priority
anim al studies are conduct ed to address im portant questions about the
effects of exposure to radio frequency energy (RF).
FDA has been a leading participant in the World Health Organization
international Electrom agnetic Fields (EMF) Project since its inception in
1996. An influential result of this work has been the developm ent of a
detailed agenda of research needs that has driven the establishm ent of
new research programs around the world. The Project has also helped
develop a series of public inform ation docum ents on EMF issues.
FDA and Cellular Telecom m unications & I nt ernet Association ( CTI A) have
a form al Cooperative Research and Developm ent Agreem ent ( CRADA) t o
do research on wireless phone safety. FDA provides the scientific
oversight, obtaining input from experts in government, industry, and
academ ic organizations. CTI A-funded research is conducted through
contracts to independent investigators. The initial research will include
both laboratory studies and studies of wireless phone users. The CRADA
will also include a broad assessm ent of additional research needs in the
context of the latest research developm ents around the world.