Developmental Toxicity of CI-921, an Anilinoacridine Antitumor Agent

CI-921, an anilinoacridine compound active against leukemic and solid tumors, was evaluated for potential developmental toxicity. Intravenous injections of CI-921 in dextrose were given to female Sprague-Dawley rats (0.1, 0.5, and 1.0 mg/kg) on Gestation Days (GD) 6–15 and to female New Zealand White rabbits (0.1, 1.0 and 2.0 mg/kg) on GD 6–18. Appropriate vehicle and untreated controls were included. Maternal and fetal parameters, including external, visceral, and skeletal malformations and variations, were assessed. Treatment of rats with 1.0 mg/kg resulted in maternal toxicity, manifested as reduced body weight gain and food consumption during and after treatment. Reduced fetal body weight, an increased incidence of stunted fetuses, malformations of the axial and appendicular skeleton, microphthalmia, and an increased number of anatomical variations (including anomalies of the axial skeleton and apparent hydronephrosis) also occurred in rats at 1.0 mg/kg. Treatment of rabbits resulted in no apparent maternal toxicity. However, reduced fetal body weight, agenesis of the azygous lobe of the lung, and an increased incidence of variations of the axial skeleton occurred at 2.0 mg/kg in rabbits. These results indicate that CI-921, at the highest dose tested in each species, produced developmental toxicity in the presence of maternal toxicity in rats, but in the absence of maternal toxicity in rabbits.