Vijayalaxmi, et al.
These authors reported two studies in which human blood lymphocytes were exposed to radiofrequency radiation.
In the first (2000), the exposure was pulsed-wave 2450 MHz radiation for 2 hours. The mean SAR was 2.135 W/kg. There were no differences between the exposed cells and the controls in DNA damage either immediately or 4 hours after the radiation.
The radiation used in the second (2001) study was 835.62 MHz (FDMA, continuous wave) for 24 hours. The mean SAR was 4.4 - 5.0 W/kg. There was no difference in the amount of genetic damage between the exposed cells and the controls.