In May 2016, NTP released preliminary study findings on cancer and cell phone radiofrequency radiation in rats. Previous human observational studies have found limited evidence for an increased risk of concern from cell phone use. In these new studies, NTP scientists found low incidences of tumors in the brains and hearts of male rats, but not in female rats. Mice studies are ongoing.
The Food and Drug Administration nominated cell phone radiofrequency radiation to the NTP for review in 2000. NTP conducted these studies in multiple phases to determine the correct field strengths that would not raise animal body temperature and to study the toxicity and cancerous effects at different time periods. Animals were exposed to the two radiofrequency radiation technologies and frequencies widely used in the United States – Code Division Multiple Access (CDMA) and Global System for Mobile (GSM) communications.
These findings have been shared with federal regulatory partners to ensure they have the latest information available for public health guidance on cellular telephones and other radiofrequency radiation emitting devices. The complete results from all the rat and mice studies are tentatively scheduled for peer review and public comment by the end of 2017.