NCIt definition : A yeast cell-derived recombinant polypeptide related to the naturally occurring, leech-derived
anticoagulant hirudin. Lepirudin directly binds to and inactivates thrombin, producing
dose-dependent increases in the activated partial thromboplastin time (aPTT) and prothrombin
time (PT). The mechanism of action of this agent is independent of antithrombin III
and is not inhibited by platelet factor 4. Natural hirudin, a family of highly homologous
isopolypeptides, is produced in trace amounts by the leech Hirudo medicinalis.;
Alternative definition : NCI-GLOSS: A drug that inhibits blood clotting. It is being studied in cancer treatment.;