Health and safety information92standard specifies test methods and performancerequirements for hearing aids and wireless phonesso that no interference occurs when a person uses acompatible phone and a compatible hearing aid atthe same time. This standard was approved by theIEEE in 2000.FDA continues to monitor the use of wireless phonesfor possible interactions with other medical devices.Should harmful interference be found to occur, FDAwill conduct testing to assess the interference andwork to resolve the problem.10. What are the results of the research donealready?The research done thus far has produced conflictingresults, and many studies have suffered from flawsin their research methods. Animal experimentsinvestigating the effects of radio frequency energy(RF) exposures characteristic of wireless phoneshave yielded conflicting results that often cannot berepeated in other laboratories. A few animal studies,however, have suggested that low levels of RF couldaccelerate the development of cancer in laboratoryanimals. However, many of the studies that showedincreased tumor development used animals that hadbeen genetically engineered or treated with cancercausing chemicals so as to be pre-disposed todevelop cancer in the absence of RF exposure. Otherstudies exposed the animals to RF for up to 22 hoursper day. These conditions are not similar to theconditions under which people use wireless phones,so we don t know with certainty what the results ofsuch studies mean for human health.Three large epidemiology studies have beenpublished since December 2000. Between them, thestudies investigated any possible associationbetween the use of wireless phones and primarybrain cancer, gioma, meningioma, or acousticneuroma, tumors of the brain or salivary gland,leukemia, or other cancers. None of the studiesdemonstrated the existence of any harmful healtheffects from wireless phone RF exposures. However,none of the studies can answer questions aboutlong-term exposures, since the average period ofphone use in these studies was around three years.11. What research is needed to decide whether RFexposure from wireless phones poses a healthrisk?A combination of laboratory studies andepidemiological studies of people actually usingwireless phones would provide some of the data thatare needed. Lifetime animal exposure studies couldbe completed in a few years. However, very largenumbers of animals would be needed to providereliable proof of a cancer promoting effect if oneexists. Epidemiological studies can provide data thatis directly applicable to human populations, but 10or more years follow-up may be needed to provideanswers about some health effects, such as cancer.This is because the interval between the time ofexposure to a cancer-causing agent and the time