Treatment options in imatinib-resistant chronic myelogenous leukemia.
OBJECTIVE
To discuss new therapeutic options available in the treatment of chronic myelogenous leukemia (CML) in patients who failed or were intolerant to imatinib therapy.


METHODS
Literature was accessed via MEDLINE (1966-May 2007), EMBASE (1991-3rd quarter 2007), the Proceedings of the American Society of Hematology (2000-2006), and the Proceedings of the American Society of Clinical Oncology (2000-2007). Search terms included imatinib, dasatinib, nilotinib, and chronic myelogenous leukemia.


METHODS
Meeting abstracts and studies that reported preclinical and Phase 1, 2, and 3 trials published in English are included.


RESULTS
Imatinib is the standard of care for CML; however, some patients develop resistance or are intolerant to the drug. Phase 1 and 2 clinical data for the more potent tyrosine kinase inhibitors, dasatinib and nilotinib, are promising. Hematologic and cytogenetic responses are reported with both. There does not appear to be cross-resistance between the drugs, although neither is effective against all mutations of the hallmark molecular marker, the Philadelphia chromosome. Novel agents are also being examined for the treatment of patients with CML, including aurora kinase and farnesyl transferase inhibitors, as well as combination therapies.


CONCLUSIONS
Dasatinib and nilotinib are second-line options for patients who have CML and are resistant or intolerant to imatinib. Toxicity profiles between agents may differ. Clinical trials with these drugs and others are ongoing.
Marshall
Helen M
HM
Duke University Hospital, Durham, NC, USA. hmarshal@gmail.com
Hammond
Julia M
JM
D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology / Q000627:therapeutic use; D001549:Benzamides; D002986:Clinical Trials as Topic / Q000639:trends; D019008:Drug Resistance, Neoplasm / Q000187:drug effects* / Q000502:physiology; D004791:Enzyme Inhibitors / Q000494:pharmacology / Q000627:therapeutic use; D006801:Humans; D000068877:Imatinib Mesylate; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy* / Q000473:pathology; D010879:Piperazines / Q000494:pharmacology / Q000627:therapeutic use*; D011743:Pyrimidines / Q000494:pharmacology / Q000627:therapeutic use*; D016896:Treatment Outcome
D000970:Antineoplastic Agents; D001549:Benzamides; D004791:Enzyme Inhibitors; D010879:Piperazines; D011743:Pyrimidines; D000068877:Imatinib Mesylate