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This is a study to determine whether RF radiation promotes tumour development in mice treated with a single application of dimethy;benz(a)anthracene (DMBA) to their shaved skin. DMBA is known to initiate tumourigenesis. The mice were randomized into four groups of 20. One group was sham-exposed, one was exposed to RFR at 849 MHz, another at 1,763 MHz, and a fourth was treated with 120O0tetradecoylphorbol-13-acetate (TPA), a tumour-promoting agent. The RFR-exposed groups were exposed at a whole-body average SAR of 0.4 W/kg for 2 cycles of 45 minutes with a 15 minute interval, 5 days a week for 19 weeks. The TPA group were given TPA twice weekly. Tumours developed only in the TPA-treated group. There were no tumours in the other group, and follow-up for 1 year confirmed the absence of tumours. C-fos and cyclin D1 expression was only present in the skin of TPA-treated groups. C-fos is a gene involved in tumour initiation, and cyclin D1 is over-expressed in various human tumours and in other carcinogen-induced animal models. The experiment was
repeated using sham and RFR-exposed groups and the absence of tumours
confirmed. The authors conclude:
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