t(14;14)(q11;q32) in biphenotypic blastic phase of chronic myeloid leukemia
N Dastugue, E Kuhlein, E Duchayne, F Roubinet, G Bourrouillou, M Attal, J Pris and P Colombies
A blastic crisis of chronic myeloid leukemia without a detectable chronic
phase is reported. At diagnosis, blast cells present
t(9;22)(q34;q11),t(14;14)(q11;q32) translocations and early B cell
phenotype (DR +, TdT +, B4 +, BA1 +, J5 +). At relapse, the malignant clone
evolves to a biphenotypic expression, the initial markers remain unchanged,
and two myeloid antigens (My 7, My 9) appear. The wide overlap in
percentages of blast cells displaying lymphoid and myeloid markers shows
that a single clone bears antigens of both lineages. Simultaneous
occurrence of a t(14;14)(q11;q32) translocation, usually found in T cell
malignancies, and of a B cell phenotype raises the question of the
relationship between chromosomal changes and surface marker expression. The
malignant cell is assumed to be a progenitor cell, already committed to
lymphoid lineage and retaining the potential to switch to myeloid lineage.
Volume 68,
Issue 4,
pp. 949-953,
10/01/1986
Copyright © 1986 by The American Society of Hematology