Camptothecin-20(S)-O-propionate (CZ48), the C20-propionate ester of CPT, is a highly effective anticancer agent. Camptothecin-20(S)-O-propionate (CZ48) is a topoisomerase-Ι inhibitor . In Vivo Camptothecin-20(S)-O-propionate (CZ48, gavage, 100 to 2000 mg/kg/day) exhibits anti-tumor activity in CLO-breast carcinoma (100 mg/kg) and PC3-prostate carcinoma (1000 mg/kg) models in mice. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Animal Model: A tumor xenograft growing in a nude mouse (size, ∼1 cm 3 ). Dosage: 100-1000 mg/kg/day. Administration: Oral gavage, for 2, 4 and 6 days, respectively. Result: Exhibited anti-tumor effect. Form:Solid