The plasticizer DEHP but not DEHS exerted a weak promoting effect in a 12-week rat liver foci bioassay, using weanling female Sprague-Dawley rats. The effect was similar after doses of 200 and 500 mg/kg body weight, given 3 times weekly by gavage for 11 consecutive weeks after initiation with a single oral dose of 8 mg DEN/kg body weight. Lower doses were ineffective. The incidence of foci with deficiency in ATPase was enhanced about twice compared to rats treated with DEN only. The incidence of foci with expression of GGTase was not affected by DEHP treatment. The results match the findings with lifetime exposure studies, when liver tumors were found in rats and mice. The actual risk for man from environmental DEHP contamination seems to be low; the intake from highly contaminated food is calculated to be about 400-fold lower than the lowest effective dose in this study.