Scientific Name: Topotecan
Brand Name: Hycamtin
Company Owner: Not Available
Mechanism Of Action Topotecan has the same mechanism of action as irinotecan and is believed to exert its cytotoxic effects during the S-phase of DNA synthesis. Topoisomerase I relieves torsional strain in DNA by inducing reversible single strand breaks. Topotecan binds to the topoisomerase I-DNA complex and prevents religation of these single strand breaks. This ternary complex interferes with the moving replication fork, which leads to the induction of replication arrest and lethal double-stranded breaks in DNA. As mammalian cells cannot efficiently repair these double strand breaks, the formation of this ternary complex eventually leads to apoptosis (programmed cell death) .
Description of the Drug: Topotecan is an antineoplastic agent used to treat ovarian cancer, small cell lung cancer, or cervical cancer.
Protein Data Bank:
Source: DrugBank Online – Retrieved 2023-01-23 from