Use of second- and third-generation tyrosine kinase inhibitors in the treatment of chronic myeloid leukemia: an evolving treatment paradigm

Clin Lymphoma Myeloma Leuk. 2015 Jun;15(6):323-34. doi: 10.1016/j.clml.2015.03.006. Epub 2015 Mar 24.

Abstract

Although imatinib remains the gold standard for first-line treatment of chronic myeloid leukemia (CML), increasing recognition of imatinib resistance and intolerance has led to the development of additional tyrosine kinase inhibitors (TKIs), which have demonstrated effectiveness as salvage therapies or alternative first-line treatments. Although additional options represent progress, the availability of 3 second-generation TKIs (dasatinib, nilotinib, and bosutinib) and 1 third-generation TKI (ponatinib) has added complexity to the treatment paradigm for CML, particularly CML in the chronic phase. Two second-generation agents (dasatinib and nilotinib) are approved for use as first-line and subsequent therapy. Thus, the appropriate sequencing of TKIs is a frequent quandary, and is incompletely addressed in clinical guidelines. Here, we review studies that might guide selection of a second- or third-generation TKI after failure of TKI therapy in patients with chronic-phase CML. These studies evaluate prognostic factors such as first-line cytogenetic response and BCR-ABL1 mutation status, which might help physicians identify patients who are likely to respond to second-generation TKIs, and those for whom ponatinib or an investigational agent might be more appropriate. We summarize evidence to date that suggests that use of a second-generation TKI as third-line therapy confers limited value in most CML patients, and we also explore the utility of current event-free survival versus traditional outcomes to predict long-term benefits of sequential TKI use. Finally, we present 3 case studies to illustrate how prognostic factors and other considerations (eg, tolerability) can be used to individualize subsequent therapy in cases of TKI resistance or intolerance.

Keywords: BCR-ABL1; Outcome; Prognosis; Resistance; Response.

Publication types

  • Case Reports
  • Review

MeSH terms

  • Adult
  • Aged
  • Antineoplastic Combined Chemotherapy Protocols / administration & dosage*
  • Antineoplastic Combined Chemotherapy Protocols / adverse effects
  • Dasatinib / administration & dosage
  • Dasatinib / adverse effects
  • Disease-Free Survival
  • Fusion Proteins, bcr-abl / genetics
  • Hematopoietic Stem Cell Transplantation
  • Humans
  • Imidazoles / administration & dosage
  • Imidazoles / adverse effects
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / drug therapy*
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / genetics
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / therapy
  • Male
  • Middle Aged
  • Patient Selection*
  • Protein Kinase Inhibitors / administration & dosage*
  • Protein Kinase Inhibitors / adverse effects
  • Pyridazines / administration & dosage
  • Pyridazines / adverse effects
  • Pyrimidines / administration & dosage
  • Pyrimidines / adverse effects

Substances

  • 4-methyl-N-(3-(4-methylimidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-((4-pyridin-3-ylpyrimidin-2-yl)amino)benzamide
  • BCR-ABL1 fusion protein, human
  • Imidazoles
  • Protein Kinase Inhibitors
  • Pyridazines
  • Pyrimidines
  • ponatinib
  • Fusion Proteins, bcr-abl
  • Dasatinib