Volume 129, Issue 4 pp. 542-549

Chimaerism analyses and subsequent immunological intervention after stem cell transplantation in patients with juvenile myelomonocytic leukaemia

Ayami Yoshimi

Ayami Yoshimi

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Charlotte M. Niemeyer

Charlotte M. Niemeyer

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Viktoria Bohmer

Viktoria Bohmer

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Ulrich Duffner

Ulrich Duffner

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Brigitte Strahm

Brigitte Strahm

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Hermann Kreyenberg

Hermann Kreyenberg

Department of Paediatric Haematology and Oncology, University Children's Hospital, Tübingen

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Dagmar Dilloo

Dagmar Dilloo

Department of Paediatric Haematology and Oncology, University Children's Hospital, Düsseldorf

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Felix Zintl

Felix Zintl

Department of Paediatrics, University of Jena, Jena

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Alexander Claviez

Alexander Claviez

Department of Paediatrics and Bone Marrow Transplant Unit, University Children's Hospital, Kiel

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Willi Wössmann

Willi Wössmann

Department of Paediatric Haematology and Oncology, University Children's Hospital, Giessen

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Bernhard Kremens

Bernhard Kremens

Department of Paediatric Haematology/Oncology, University Children's Hospital, Essen

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Wolfgang Holter

Wolfgang Holter

Department of Paediatrics, University of Erlangen-Nuremberg, Erlangen

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Dietrich Niethammer

Dietrich Niethammer

Department of Paediatric Haematology and Oncology, University Children's Hospital, Tübingen

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James F. Beck

James F. Beck

Department of Paediatric Haematology and Oncology, University Children's Hospital, Tübingen

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Udo Kontny

Udo Kontny

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Peter Nöllke

Peter Nöllke

Department of Paediatrics and Adolescent Medicine, University of Freiburg, Freiburg

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Thomas Klingebiel

Thomas Klingebiel

Department of Haematology/Oncology, University Children's Hospital, Frankfurt, Germany

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Peter Bader

Peter Bader

Department of Haematology/Oncology, University Children's Hospital, Frankfurt, Germany

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First published: 06 May 2005
Citations: 40
Ayami Yoshimi, MD, Division of Paediatric Haematology and Oncology, Department of Paediatrics and Adolescent Medicine, University of Freiburg, Mathildenstrasse 1, 79106 Freiburg, Germany.
E-mail: [email protected]

Summary

Chimaerism analysis was performed by polymerase chain reaction amplification of short-tandem repeat markers in 30 children following haematopoietic stem cell transplantation for juvenile myelomonocytic leukaemia (JMML). Fourteen patients always had complete chimaerism (CC); one of them relapsed after the discontinuation of the study and 13 continued in complete remission (CR). Mixed chimaerism (MC) was noted in 16 patients. Of those 12 patients demonstrated increasing MC (i-MC); 10 relapsed and two achieved CC following discontinuation of immunosuppressive therapy (IST). Four other patients demonstrating only transient MC are alive in CR. MC with up to 20% of autologous cells could be successfully eradicated without induction of severe graft-versus-host disease when IST was reduced or discontinued directly after the first demonstration of MC. At the same time, MC with up to 10% of autologous cells could disappear without intervention. The interval between MC and relapse ranged from 0–320 d (median 38 d). Donor leucocyte infusion was given to six patients with i-MC, but only one patient responded. Peripheral blood seems as valuable as bone marrow for chimaerism studies. In conclusion, serial quantitative chimaerism studies can identify patients with i-MC who are at high risk for relapse of JMML. Immediate withdrawal of IST is advised in these patients.

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