A 45-year-old female was evaluated by her physician because she had unexplained bruising on her upper torso. Patient history was unremarkable. Physical examination revealed a palpable liver and spleen. CBC results revealed:
WBC count: 12 x 109/L
Hb: 8.7 g/dL
Hct: 25%
Normal indices
PLT count: 5 x 109/L
Differential: 80% blasts and 15% promyelocytes present
Bone marrow findings: hypercellular marrow with 47% myeloblasts present. Nucleated erythroblasts: 22%; promyelocytes: 28%; megakaryopoiesis appears normal.
Cytogenetic analysis: t(15, 17) present.
Flow cytometry has also been ordered on this patient. Which of the following markers will stain positive in this case?
a. HLA-DR
b. CD35
c. CD33
d. CD8
Correct Answers: C
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