title: Clinical activity of tipifarnib in hematologic malignancies.
abstract: Farnesyltransferase inhibitors are a novel class of anticancer agents that competitively inhibit farnesyltransferase. Initially developed to inhibit the farnesylation that is necessary for Ras activation, their mechanism of action seems to be more complex, involving other proteins unrelated to Ras. Of the four classes of farnesyltransferase inhibitors, at least three agents have been investigated in hematologic malignancies. Tipifarnib (R-115777), an orally administered non-peptidomimetic farnesyltransferase inhibitor, has shown promising clinical activity. Preliminary results from clinical trials demonstrate enzyme target inhibition, an acceptable toxicity profile and promising evidence of clinical activity. Ongoing studies will better determine the mechanism of action of tipifarnib and the role of combination with other agents, defining its place in the therapeutic arsenal of hematologic disorders.
authors.affiliation: MD Anderson Cancer Center, Department of Leukemia, Unit 428, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
authors.forename: Elias
authors.initials: E
authors.lastname: Jabbour
authors.forename: Hagop
authors.initials: H
authors.lastname: Kantarjian
authors.forename: Jorge
authors.initials: J
authors.lastname: Cortes
mesh_terms: D000818:Animals; D004791:Enzyme Inhibitors / Q000493:pharmacokinetics / Q000627:therapeutic use*; D051231:Farnesyltranstransferase / Q000037:antagonists & inhibitors*; D019337:Hematologic Neoplasms / Q000188:drug therapy*; D006801:Humans; D009190:Myelodysplastic Syndromes / Q000188:drug therapy; D015363:Quinolones / Q000493:pharmacokinetics / Q000627:therapeutic use*
chemical_list: D004791:Enzyme Inhibitors; D015363:Quinolones; D051231:Farnesyltranstransferase; C402769:tipifarnib