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CD47 protein expression in acute myeloid leukemia: A tissue microarray-based analysis.

Serena Galli1, Inti Zlobec2, Christian Schürch3

  • 1Institute of Pathology, University of Bern, Bern, Switzerland; Department of Oncology, University Hospital Bern, Bern, Switzerland.

Leukemia Research
|May 7, 2015
PubMed
Summary
This summary is machine-generated.

CD47 protein expression on acute myeloid leukemia (AML) bone marrow blasts does not correlate with patient survival. This study found CD47 expression linked to blast infiltration and NPM1 mutations, but not overall outcomes.

Keywords:
Acute myeloid leukemiaBone marrowCD47Tissue microarray

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Area of Science:

  • Hematology
  • Immunology
  • Oncology

Background:

  • CD47-SIRPα interaction inhibits phagocytosis.
  • CD47 is overexpressed in acute myeloid leukemia (AML) and linked to poor survival.
  • Investigating CD47 expression in bone marrow is crucial for understanding AML.

Purpose of the Study:

  • To assess the correlation between CD47 protein expression in bone marrow (BM) tissue microarrays (TMAs) and clinical outcomes in AML patients.
  • To evaluate CD47 protein expression using immunohistochemistry (IHC) in AML bone marrow.
  • To determine the prognostic significance of CD47 expression in AML.

Main Methods:

  • Utilized bone marrow tissue microarrays (TMAs) from AML patients.
  • Performed semi-quantitative scoring of CD47 protein expression via immunohistochemistry (IHC).
  • Correlated CD47 expression with clinical parameters, prognostic factors, and survival data.

Main Results:

  • CD47 protein expression was high in 25% of AML patients.
  • High CD47 expression correlated with increased bone marrow blast infiltration and peripheral blood blasts.
  • High CD47 expression was associated with nucleophosmin (NPM1) gene mutations.
  • CD47 expression did not significantly correlate with overall survival, progression-free survival, or treatment response.

Conclusions:

  • Bone marrow TMAs allow for rapid, reproducible IHC analysis of CD47 expression in AML.
  • Unlike circulating AML blasts, CD47 expression on bone marrow blasts is not a negative prognostic marker for overall survival in AML.