ChemGenex Pharmaceuticals announces that the U.S. Food and Drug Administration's (FDA) Office of Oncology Drug Products has issued a complete response letter regarding the new drug application (NDA) for OMAPRO™ (omacetaxine mepesuccinate) for the treatment of adults with chronic myeloid leukemia (CML) who have failed prior therapy with imatinib and have the Bcr-Abl T315I mutation. The complete response letter does not contain a request for a new study, nor is there a request for enrollment of additional patients into the pivotal study on OMAPRO... 
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