ICBE-EMF reports: a new commentary by Ronald Melnick, Joel Moskowitz, and Paul Héroux in the journal Environmental Health finds that 2026 Japanese and Korean "validation" studies were too underpowered and narrowly designed to confirm or refute the U.S. National Toxicology Program's finding that cell phone radiofrequency radiation causes cancer in rats. The authors identify reduced statistical power, a single exposure dose, and heavy involvement of ICNIRP-linked advisors in the follow-up studies.
They note the Korean study still found a heart schwannoma rate matching the NTP's own results despite being underpowered, and conclude the NTP's original "clear evidence" finding stands. ICBE-EMF calls on regulators to base exposure limits on the strongest available evidence rather than on the flawed follow-up studies.
"The Japan and Korea studies cannot be used as proof of safety. To properly verify a study that found clear evidence of rare tumors like heart schwannomas, follow-up research must be designed with equal or greater sensitivity. [...] These studies appear to be engineered to come back negative."
"Millions of people carry cell phones against their bodies for hours a day, and children are being exposed over far longer lifetimes than any generation before them. Public health decisions about safety limits should be built on the most rigorous animal evidence available, not on studies constructed in a way that was unlikely to detect harm even if it exists."
"These studies did not reproduce the original methodology, exposure assessment, or study conditions. From a biostatistical perspective, testing only 70 animals at a single dose level leaves a study severely underpowered to detect rare carcinogenic events. [...] Importantly, when the NTP and Korean and Japanese studies are considered together, the overall evidence confirms cancer risk."
"[...] the Japan and Korea studies do not alter the National Toxicology Program’s finding of “clear evidence” of cancer."
Conflicting views in experimental carcinogenesis: a commentary on design and methodological deficiencies in the follow-up validation studies on radiofrequency radiation
Melnick, Moskowitz & Héroux et al. (2026) Environmental Health Journal Level 1ⓘ
