2000. Bet ween t hem , t he studies invest igat ed any possible associat ion
bet ween t he use of w ireless phones and prim ary brain cancer, gliom a,
m eningiom a, or acoust ic neurom a, t um ors of t he brain or salivary gland,
leukem ia, or other cancers. None of t he studies dem onstr ated t he
existence of any har m ful healt h effects from wireless phones RF
ex posur es. However, none of t he st udies can answ er quest ions about
long-t erm exposures, since the average period of phone use in these
st udies was around t hree years.
W ha t r ese a rch is n ee de d t o de cide w h et he r RF exposure fr om
w irele ss phones poses a hea lt h risk ?
A com binat ion of labor at ory st udies and epidem iological st udies of people
act ually using wireless phones would provide som e of the dat a t hat are
needed. Lifet im e anim al exposure st udies could be com plet ed in a few
years. However, very large num bers of anim als would be needed t o
provide reliable proof of a cancer prom ot ing effect if one exist s.
Epidem iological st udies can provide dat a t hat is direct ly applicable t o
hum an populat ions, but t en or m ore years' follow-up m ay be needed to
provide answers about som e healt h effect s, such as cancer. This is
because t he interval bet ween the tim e of exposure t o a cancer-causing
agent and t he t im e t um ors develop - if t hey do - m ay be m any, m any
years. The int erpretat ion of epidem iological st udies is ham pered by
difficult ies in m easur ing act ual RF ex posur e during day -to-day use of
wireless phones. Many fact or s affect t his m easurem ent , such as t he angle
at which t he phone is held, or which m odel of phone is used.
W ha t is FD A doing t o f in d ou t m or e a bou t t h e p ossible h ea lt h
effe ct s of w ir eless phone RF?
FDA is w or king w it h t he U. S. Nat ional Toxicology Pr ogr am and w it h
groups of inv est igat ors ar ound t he w orld t o ensur e t hat high pr ior it y
anim al st udies ar e conduct ed t o address im port ant quest ions about the
effect s of exposur e t o r adio fr equency energy ( RF) .
FDA has been a leading part icipant in t he World Health Organizat ion
int er nat ional Elect r om agnet ic Fields ( EMF) Pr oj ect since it s incept ion in
1996. An influent ial result of this work has been t he developm ent of a
det ailed agenda of r esear ch needs that has driven t he est ablishm ent of
new research program s around t he world. The Proj ect has also helped
develop a series of public inform ation docum ent s on EMF issues.
FDA and Cellular Telecom m unicat ions & I nt ernet Associat ion ( CTI A) have
a form al Cooperativ e Research and Developm ent Agr eem ent ( CRADA) t o
do research on wireless phone safety. FDA provides the scientific
over sight , obt ain ing input fr om expert s in governm ent , indu st ry, and
academ ic organizat ions. CTI A-funded research is conduct ed t hrough
cont ract s t o independent invest igator s. The init ial r esearch w ill include
both labor atory studies and st udies of wireless phone user s. The CRADA
will also include a broad assessm ent of additional research needs in the
cont ex t of t he lat est r esearch dev elopm ent s ar ound t he world.