Volume 173, Issue 2 pp. 219-235
Research Paper

CD45RA, a specific marker for leukaemia stem cell sub-populations in acute myeloid leukaemia

Bas Kersten

Bas Kersten

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

Both authors contributed equally.Search for more papers by this author
Matthijs Valkering

Matthijs Valkering

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

Both authors contributed equally.Search for more papers by this author
Rolf Wouters

Rolf Wouters

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Rosa van Amerongen

Rosa van Amerongen

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Diana Hanekamp

Diana Hanekamp

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Zinia Kwidama

Zinia Kwidama

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Peter Valk

Peter Valk

Department of Haematology, Erasmus Medical Centre, Rotterdam, the Netherlands

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Gert Ossenkoppele

Gert Ossenkoppele

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Wendelien Zeijlemaker

Wendelien Zeijlemaker

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Gertjan Kaspers

Gertjan Kaspers

Department of Paediatric Oncology/Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Jacqueline Cloos

Jacqueline Cloos

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

Department of Paediatric Oncology/Haematology, VU University Medical Centre, Amsterdam, the Netherlands

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Gerrit J. Schuurhuis

Corresponding Author

Gerrit J. Schuurhuis

Department of Haematology, VU University Medical Centre, Amsterdam, the Netherlands

Both authors contributed equally.

Correspondence: Dr Gerrit J. Schuurhuis, Department of Haematology, VU University Medical Centre, De Boelelaan 1117, 1081HV Amsterdam, The Netherlands

E-mail: [email protected]

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First published: 27 January 2016
Citations: 57

Abstract

Chemotherapy resistant leukaemic stem cells (LSC) are thought to be responsible for relapses after therapy in acute myeloid leukaemia (AML). Flow cytometry can discriminate CD34+CD38 LSC and normal haematopoietic stem cells (HSC) by using aberrant expression of markers and scatter properties. However, not all LSC can be identified using currently available markers, so new markers are needed. CD45RA is expressed on leukaemic cells in the majority of AML patients. We investigated the potency of CD45RA to specifically identify LSC and HSC and improve LSC quantification. Compared to our best other markers (CLL-1, also termed CLEC12A, CD33 and CD123), CD45RA was the most reliable marker. Patients with high percentages (>90%) of CD45RA on CD34+CD38 LSC have 1·69-fold higher scatter values compared to HSC (P < 0·001), indicating a more mature CD34+CD38 phenotype. Patients with low (<10%) or intermediate (10–90%) CD45RA expression on LSC showed no significant differences to HSC (1·12- and 1·15-fold higher, P = 0·31 and P = 0·44, respectively). CD45RA-positive LSC tended to represent more favourable cytogenetic/molecular markers. In conclusion, CD45RA contributes to more accurate LSC detection and is recommended for inclusion in stem cell tracking panels. CD45RA may contribute to define new LSC-specific therapies and to monitor effects of anti-LSC treatment.

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