
MIAMI BEACH -The Bcr-Abl tyrosine kinase inhibitorPD173955 (PD17) binds to the targetATP binding pocket even moreefficiently than STI-571 (imatinibmesylate, Gleevec). It shows 15 to20 times greater efficacy in chronicmyelogenous leukemia (CML) celllines because it can bind to eitheropen or closed activation loops.