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A Combinatorial Single-cell Approach to Characterize the Molecular and Immunophenotypic Heterogeneity of Human Stem and Progenitor Populations
Published on: October 25, 2018
Gene-expression profiling identifies distinct subclasses of core binding factor acute myeloid leukemia
Lars Bullinger1, Frank G Rücker, Stephan Kurz
1Department of Internal Medicine III, University of Ulm, Ulm, Germany. lars.bullinger@uniklinik-ulm.de
Blood
|May 9, 2007
Summary
Core binding factor (CBF) acute myeloid leukemia (AML) shows significant heterogeneity. New molecular profiling identified an unfavorable subgroup with shorter survival, linked to specific genetic alterations and signaling pathways.
Area of Science:
- Hematology
- Molecular Biology
- Oncology
Background:
- Core binding factor (CBF) acute myeloid leukemia (AML) comprises subgroups with generally favorable prognoses.
- Existing classification systems do not fully capture the biological and clinical heterogeneity within CBF AML.
- Improved molecular characterization is needed to refine prognostic stratification.
Purpose of the Study:
- To molecularly characterize a large cohort of CBF AML patients.
- To identify novel subgroups within CBF AML based on gene expression profiles.
- To investigate potential cooperating pathways contributing to leukemogenesis and clinical heterogeneity.
Main Methods:
- Gene expression profiling of 93 CBF AML patients (inv(16) and t(8;21)).
- Unsupervised hierarchical clustering to define molecular subgroups.
- Supervised analyses to identify differentially expressed genes and pathways.
- Correlation analysis with clinical parameters and genetic mutations (FLT3, KIT, NRAS).
Main Results:
- A subgroup of 35 CBF cases with significantly shorter overall survival was identified (P = .03).
- This unfavorable subgroup showed elevated white blood cell counts and FLT3 internal tandem duplications (P = .011, P = .026).
- Gene expression signatures suggested distinct cooperating pathways: mTOR signaling in favorable vs. MAPK signaling and chemoresistance in unfavorable CBF AML.
Conclusions:
- Gene expression profiling reveals a prognostically relevant molecular subgroup within CBF AML.
- Distinct signaling pathways may underlie the heterogeneity observed in CBF AML.
- Further validation is needed to confirm the leukemogenic relevance of identified molecular signatures.
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