preneoplastic lesions
The total number and average area of glutathione S-transferase placenta form-positive foci, preneoplastic lesions in rat livers, were significantly increased in the 20 ppm DPAA group (10.5    2.2/cm(2), 5.3    1.7 mm(2)/cm(2)) compared with the 0 ppm DPAA group (6.2    2.9/cm(2), 2.4    1.4 mm(2)/cm(2)).