https://www.cnbc.com/2018/02/03/high-levels-of-cellphone-radiation-linked-to-tumors-in-male-rats-us-study.html >Male rats exposed to very high levels of the kind of radiation emitted by cellphones developed tumors in the tissues around their hearts, according to a draft report by U.S. government researchers on the potential health risks of the devices. >Female rats and mice exposed in the same way did not develop tumors, according to the preliminary report from the U.S. National Toxicology Program (NTP), a part of the National Institute of Environmental Health Sciences.