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Leukemia. 2015 Jan;29(1):137-44. doi: 10.1038/leu.2014.173. Epub 2014 Jun 3.

Comparison of minimal residual disease as outcome predictor for AML patients in first complete remission undergoing myeloablative or nonmyeloablative allogeneic hematopoietic cell transplantation.

Author information

1
1] Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA [2] Division of Hematology, Department of Medicine, University of Washington, Seattle, WA, USA [3] Department of Epidemiology, University of Washington, Seattle, WA, USA.
2
1] Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA [2] Division of Medical Oncology, Department of Medicine, University of Washington, Seattle, WA, USA.
3
Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
4
Department of Medicine, Residency Program, University of Washington, Seattle, WA, USA.
5
Division of Hematopathology, Department of Laboratory Medicine, University of Washington, Seattle, WA, USA.

Abstract

Minimal residual disease (MRD) is associated with adverse outcome in acute myeloid leukemia (AML) after myeloablative (MA) hematopoietic cell transplantation (HCT). We compared this association with that seen after nonmyeloablative (NMA) conditioning in 241 adults receiving NMA (n=86) or MA (n=155) HCT for AML in first remission with pre-HCT bone marrow aspirates assessed by flow cytometry. NMA patients were older and had more comorbidities and secondary leukemias. Three-year relapse estimates were 28% and 57% for MRD(neg) and MRD(pos) NMA patients, and 22% and 63% for MA patients. Three-year overall survival (OS) estimates were 48% and 41% for MRD(neg) and MRD(pos) NMA patients and 76% and 25% for MA patients. This similar OS after NMA conditioning was largely accounted for by higher non-relapse mortality (NRM) in MRD(neg) (30%) compared with MRD(pos) (10%) patients, whereas the reverse was found for MRD(neg) (7%) and MRD(pos) (23%) MA patients. A statistically significant difference between MA and NMA patients in the association of MRD with OS (P<0.001) and NRM (P=0.002) but not relapse (P=0.17) was confirmed. After adjustment, the risk of relapse was 4.51 times (P<0.001) higher for MRD(pos) patients. These data indicate that the negative impact of MRD on relapse risk is similar after NMA and MA conditioning.

PMID:
24888275
PMCID:
PMC4254901
DOI:
10.1038/leu.2014.173
[Indexed for MEDLINE]
Free PMC Article

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