Adriamycin (Doxorubicin, Hydroxydaunorubicin), a cytotoxic anthracycline antibiotic, is an anti-cancer chemotherapy agent, inhibits topoisomerase II with an IC50 of 2.67 μM, thus stopping DNA replication, and induces apoptosis, also inhibits human DNA topoisomerase I with an IC50 of 0.8 μM.