Acute myeloid leukemia with t(6;9)(p23;q34) is associated with dysplasia and a high frequency of flt3 gene mutations.
We report 12 cases of t(6;9)(p23;q34)-positive acute myeloid leukemia (AML), all classified using the criteria of the World Health Organization classification. There were 10 women and 2 men with a median age of 51 years (range, 20-76 years). Dysplasia was present in all cases (9 previously untreated), and basophilia was present in 6 (50%). Immunophenotypic studies showed that the blasts were positive for CD9, CD13, CD33, CD38, CD117, and HLA-DR in all cases assessed. CD34 was positive in 11 (92%) of 12, and terminal deoxynucleotidyl transferase was positive in 7 (64%) of 11 cases. The t(6;9) was the only cytogenetic abnormality detected in 7 cases (58%), and 5 cases had additional chromosomal abnormalities. Of 8 cases assessed, 7 (88%) had flt3 gene mutations. We conclude that t(6;9)-positive AML cases have distinctive morphologic features, an immunophenotype suggesting origin from an early hematopoietic progenitor cell, and a high frequency of flt3 gene mutations.
Oyarzo
Mauricio P
MP
Department of Hematopathology, The University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
Lin
Pei
P
Glassman
Armand
A
Bueso-Ramos
Carlos E
CE
Luthra
Rajyalakshmi
R
Medeiros
L Jeffrey
LJ
D000208:Acute Disease; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000378:metabolism; D001491:Basophils / Q000473:pathology; D017931:DNA Primers; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D007951:Leukemia, Myeloid / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009154:Mutation; D015513:Oncogene Proteins / Q000378:metabolism; D015514:Oncogene Proteins, Fusion; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051941:fms-Like Tyrosine Kinase 3
D015703:Antigens, CD; C104001:DEK-CAN fusion protein, recombinant; D017931:DNA Primers; D015513:Oncogene Proteins; D015514:Oncogene Proteins, Fusion; D011518:Proto-Oncogene Proteins; D011993:Recombinant Fusion Proteins; C497970:FLT3 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D051941:fms-Like Tyrosine Kinase 3