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C3H/10T1/2 cells were exposed to 2.45-GHz microwaves for 24 h and/or 1.5 Gy of 238-kVp X rays at 3.75 Gy/min. Transformation frequency and cell survival were measured with or without postirradiation addition of the tumor promoter tetradecanoyl-phorbol-13-acetate (TPA) at 0.1 microgram/ml. We previously reported (Carcinogenesis 6,859-864, 1985) an enhancement of transformation frequency when 10T1/2 cells exposed to a special sequence of microwaves and X rays were subsequently cultured in TPA. The same sequence of microwaves and X rays without promotion resulted in a transformation response similar to that induced by X rays alone. We now report statistically significant (at P greater than 0.999) enhancement of transformation response by TPA in cells exposed to 2.45-GHz microwaves (SAR = 4.4 W/kg). Microwaves alone had no effect on transformation. Plating efficiency and cell survival were not affected by TPA or microwave treatments.
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Balcer‐Kubiczek et al. (1989) studied this question.
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