Original Article

International Journal of Hematology

, Volume 90, Issue 3, pp 292-302

CD34+ cell subpopulations detected by 8-color flow cytometry in bone marrow and in peripheral blood stem cell collections: application for MRD detection in leukemia patients

  • Elisabet BjörklundAffiliated withDepartment of Pathology, Karolinska University Hospital, Solna and Karolinska Institute Email author 
  • , Astrid GruberAffiliated withDepartment of Medicine, Division of Hematology, Karolinska University Hospital
  • , Joanna MazurAffiliated withDepartment of Child and Adolescent Health, National Research Institute of Mother and Child
  • , Anna MårtenssonAffiliated withDepartment of Clinical Immunology and Transfusion Medicine, Karolinska University HospitalDatabyrån för informationsbehandling
  • , Mona HanssonAffiliated withDepartment of Clinical Immunology and Transfusion Medicine, Karolinska University Hospital
  • , Anna PorwitAffiliated withDepartment of Pathology, Karolinska University Hospital, Solna and Karolinska Institute

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Abstract

Fast development in polychromatic flow cytometry (PFC) makes it possible to study CD34+ cells with two scatter and eight fluorescence parameters. Minimal residual disease (MRD) is determined as persistence of leukemic cells at submicroscopic levels in bone marrow (BM) of patients in complete remission. MRD can be present in collections of hematopoietic stem cell from blood (HSC-B). Using PFC, we have defined patterns of antigen expression in CD34+ cell subpopulations in BM and applied them as templates in MRD analysis. Twelve BM samples from hospital control (HC) patients with no signs of hematological malignancy were studied using five 8-color monoclonal antibody combinations detecting subsets of CD34+ cells. These patterns have been used as templates to determine levels of MRD in HSC-B collections from six AML patients. Several subsets of CD34+ precursor cells were found to be present at very low frequencies (<10−4) in BM and/or HSC-B collections. All six HSC-B collections from AML patients showed MRD by 8-color technique and only three by previously applied 3-color method. The 8-color technique showed promising results in efficient detection of different CD34+ subpopulations of HSC-B and in MRD quantification. Monitoring of MRD should become a part of quality control of HSC-B collections.

Keywords

Hematopoietic stem cell transplantation Minimal residual disease Acute myeloid leukemia CD34+ cells Flow cytometry