Prognostic significance of additional chromosomal abnormalities at the time of diagnosis in patients with chronic myeloid leukemia treated with frontline tyrosine kinase inhibitors.

Abstract

Additional cytogenetic abnormalities (ACA) are considered a high risk feature in chronic myeloid leukemia (CML). However, its prognostic significance at the time of diagnosis in the setting of new tyrosine kinase inhibitors (TKIs) is less well understood. Patients with CML in CP with or without ACA at diagnosis treated with frontline TKIs in prospective clinical trials were analyzed for outcomes. Among 603 patients treated, 29 (5%) had ACA. Patients with ACA included 2 of 72 (2.8%) treated with imatinib 400 mg, 9 of 207 (4.3%) with imatinib 800 mg, 10 of 148 (6.7%) with dasatinib, 6 of 126 (4.7%) with nilotinib, and 2 of 50 (4%) with ponatinib. There was a significantly higher rate of complete cytogenetic response (CCyR) at 6 months in patients without ACA (P = .02). However cumulative CCyR and major molecular response (MMR) rates were not different. Similarly, MR4.0 and MR4.5 rates were similar for both groups; two CML-ACA patients maintained MR 4.5 for at least 2 years. At 5 years, ACA at diagnosis did not significantly impact transformation-free, failure-free, event-free, or overall survival expectations. Acknowledging small sample size estimates, response rates and survival outcomes were comparable in CP with ACA irrespective of whether chromosomal abnormalities were "major route" or other. The presence of ACA at diagnosis does not confer worse prognosis for patients with CML treated with TKI. Thus, the presence of ACA at diagnosis should not alter treatment strategies in these patients.

• Authors: Ahmad Alhuraiji, Hagop Kantarjian, Prajwal Boddu, Farhad Ravandi, Gautam Borthakur, Courtney DiNardo, Naval Daver, Tapan Kadia, Naveen Pemmaraju, Sherry Pierce, Guillermo Garcia-Manero, William Wierda, Srdan Verstovsek, Elias Jabbour, Jorge Cortes
• Journal: American journal of hematology (Am J Hematol) Vol. 93 Issue 1 Pg. 84-90 (01 2018) ISSN: 1096-8652 [Electronic] United States
• PMID: 29027261 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
• Copyright: © 2017 Wiley Periodicals, Inc.

Chemical References

• Protein Kinase Inhibitors

Topics

• Adolescent
• Adult
• Aged
• Aged, 80 and over
• Female
• Humans
• Leukemia, Myelogenous, Chronic, BCR-ABL Positive (drug therapy, immunology, pathology)
• Male
• Middle Aged
• Prognosis
• Protein Kinase Inhibitors (therapeutic use)
• Treatment Outcome
• Young Adult