Myeloid/natural killer cell precursor blast crisis of chronic myelogenous leukemia with two Philadelphia (Ph-1) chromosomes.
We report on a 30-year-old patient with blast crisis of a chronic myelogenous leukemia (CML) that shows immunophenotypic features similar to those of the myeloid/natural killer (NK) cell precursor leukemia previously described. Expression of CD13/CD33/CD65 as well as MPO+/LF- blasts was classified as a myelogenous blast crisis of a CML. In addition, the blasts were positive for CD7/CD56. Other lymphoid markers were not expressed. Cytogenetic and molecular cytogenetic examinations showed two Philadelphia (Ph-1) chromosomes and a trisomy 8. Similar to expression of the myeloid/NK cell precursor phenotype in acute myelogenous leukemia (AML), it is possible to exhibit this phenotype in Ph-1-positive CML. Only one case report of myeloid/NK precursor phenotype blast crisis of CML was found in the literature. Therefore, it is not clear whether this phenotype is a distinct biologic and clinical disease entity of CML, as is the case in the respective AML phenotype.
Kahl
C
C
Department of Medicine, Otto-von-Guericke-University of Magdeburg, Germany.
Pelz
A F
AF
Bartsch
R
R
Jentsch-Ullrich
K
K
Brückner
R
R
Fostitsch
H P
HP
Franke
A
A
D000328:Adult; D001752:Blast Crisis / Q000235:genetics / Q000473:pathology*; D006801:Humans; D016130:Immunophenotyping; D007694:Killer Cells, Natural / Q000473:pathology*; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000473:pathology*; D008297:Male; D022423:Myeloid Cells / Q000473:pathology*