We experienced 2 cases of leukemia expressing Philadelphia chromosome (Ph
1) and major breakpoint cluster region (M-BCR) rearrangement.
[Case 1] A 71-year-old woman was admitted because of chest pain and thrombophlebitis of the left leg. Hematological data on admission revealed as follows: WBC 19, 100/μl with 27% lymphoblasts expressing CD 10 and CD 19, Hb 12.3g/dl, Pit 11.4×10
4/μl. Bone marrow aspiration showed hypercellular picture and 72.0% of the cells were lymphoblasts. Ph
1 and M-BCR rearrangement were both detected. After remission induction chemotherapy (1-DVP), complete remission was obtained, and then, Ph
1 and M-BCR rearrangement were both disappeared, this case was thought to be Ph
1 (+) acute lymphocytic leukemia (ALL).
[Case 2] A 55-year-old man was admitted because of fever and right hypochondralgia. Hematological data on admission revealed as follows: WBC 127, 500/μl with 23% blasts, Hb 16.1g/dl, Pit 12.5×10
4/μl. Bone marrow aspiration showed hypercellular picture and 64.4% of the cells were blasts expressing both lymphoid and myeloid markers. After remission induction chemotherapy (VP), hematological remission was obtained, but then, Ph
1 and M-BCR rearrangement were both remained. This case was thought to be blast crisis phase of chronic myelogenous leukemia (CML).
These two cases suggest that consolidation chemotherapy for Ph
1 (+), M-BCR rearrangement (+) leukemia must be decided based on the clinical and cytogenetical course.
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