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Blood, 1 May 2006, Vol. 107, No. 9, pp. 3481-3485.
Prepublished online as a Blood First Edition Paper on February 2, 2006; DOI 10.1182/blood-2005-09-3724.
Previous Article | Next Article 
Submitted September 15, 2005
Accepted December 24, 2005
Age and acute myeloid leukemia
Frederick R Appelbaum*, Holly M Gundacker, David R Head, Marilyn L Slovak, Cheryl L Willman, John E Godwin, Jeanne E Anderson, and Stephen H Petersdorf
Fred Hutchinson Cancer Research Center, Seattle, WA, USA
Southwest Oncology Group Statistical Center, Seattle, WA, USA
Vanderbilt University Medical Center, Nashville, TN, USA
City of Hope National Medical Center, Duarte, CA, USA
University of New Mexico, Albuquerque, NM, USA
Loyola University Stritch School of Medicine, Maywood, IL, USA
Katmai Oncology Group, Anchorage, AK, USA
Seattle Cancer Care Alliance, Seattle, WA, USA
* Corresponding author; email: fappelba{at}fhcrc.org.
We conducted a retrospective analysis of 968 adults with AML on five recent Southwest Oncology Group trials to understand how the nature of acute myeloid leukemia (AML) changes with age.
Older study patients with AML presented with poorer performance status, lower white counts and a lower percent of marrow blasts. Multi-drug resistance was found in 33% of AMLs in patients < age 56 compared to 57% in those > 75. The percent of patients with favorable cytogenetics dropped from 17% in those < age 56 to 4% in those > 75. In contrast, the proportion of patients with unfavorable cytogenetics increased from 35% in those < age 56 to 51% in patients > 75. Particularly striking were the increases in abnormalities of chromosomes 5, 7, and 17 among the elderly. The increased incidence of unfavorable cytogenetics contributed to their poorer outcome and within each cytogenetic risk group, treatment outcome deteriorated markedly with age. Finally, the combination of a poor performance status and advanced age identified a group of patients with a very high likelihood of dying within 30 days of initiating induction therapy. The distinct biology and clinical responses seen argue for age-specific assessments when evaluating therapies for AML.

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