Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Cytogenetic polyclonality in hematologic malignancies

  • Bertil Johansson
  • Rolf Billström
  • Karin Broberg Palmgren
  • Thoas Fioretos
  • Per-Gunnar Nilsson
  • Tomas Ahlgren
  • Claes Malm
  • Bengt O Samuelsson
  • Felix Mitelman
Publishing year: 1999
Language: English
Pages: 222-229
Publication/Series: Genes, Chromosomes and Cancer
Volume: 24
Issue: 3
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

The present study was undertaken to ascertain the frequency of cytogenetic polyclonality in various hematologic malignancies and to investigate whether morphologic subgroup, age, gender, or previous genotoxic exposure influences the incidence. Among 2,243 cytogenetically investigated hematologic malignancies, 10 acute myeloid leukemias (AML), 5 myelodysplastic syndromes (MDS), 2 acute lymphoblastic leukemias (ALL), 1 acute undifferentiated leukemia (AUL), 1 atypical Philadelphia chromosome-negative (Ph-) chronic myeloid leukemia (CML), 1 chronic myeloproliferative disorder (CMD), and 1 chronic lymphoproliferative disorder (CLD) with karyotypically unrelated clones were identified, constituting 2.6% of AML, 1.6% of MDS, 0.8% of ALL, 13% of AUL, 9.1% of Ph- CML, 1.5% of CMD, and 2.8% of CLD with chromosomal abnormalities. In contrast to the cytogenetic features, the X-inactivation pattern was monoclonal in the two informative female patients that could be investigated. Among 17,733 karyotypically aberrant published cases surveyed, significant frequency differences (P < 0.001) were discerned: 1.7% of 6,526 AML, 3.4% of 2,391 MDS, 0.4% of 1,920 Ph+ CML, 2.9% of 856 CMD, 0.9% of 4,226 ALL, and 5.8% of 1,814 CLD displayed unrelated clones. The incidence of cytogenetic polyclonality did not differ significantly among the MDS, CMD, or ALL subgroups, between males and females, between children (< 16 years) and adults, or between B- and T-cell ALL, whereas the frequencies varied among the AML FAB types (P < 0.05), among the different CLD entities (P < 0.001), and between B- and T-cell CLD (P < 0.001). Furthermore, the incidence was higher in therapy-related AML and MDS than in de novo AML and MDS (P < 0.001 and P < 0.01, respectively).


  • Medical Genetics


  • ISSN: 1045-2257
Thoas Fioretos
E-mail: thoas.fioretos [at]

Principal investigator

Division of Clinical Genetics

+46 46 222 45 95

+46 70 334 33 67