Neoplastic transformation of C3H/10T1/2 cells following exposure to 120-Hz modulated 2.45-GHz microwaves and phorbol ester tumor promoter.
Balcer-Kubiczek EK, Harrison GH. · 1991
Researchers exposed mouse cells to microwave radiation (same frequency as WiFi) plus a tumor-promoting chemical. While microwaves alone caused no harm, the combination significantly increased cancer-like cell transformation to levels matching X-ray exposure, suggesting microwaves may promote cancer under certain conditions.