NCIt definition : Any substance that inhibits topoisomerase-II, a topoisomerase that relieves torsional
stress in a DNA molecule by cutting both strands of the DNA double helix. A topoisomerase
II inhibitor can either stabilize the DNA-protein complex or inhibit the catalytic
activity of the enzyme. Inhibition of topoisomerase-II causes DNA damage, inhibition
of DNA replication, and apoptosis.;