Abnormalities involving the long arm of chromosome #11 have been shown to be involved in a high proportion of acute nonlymphocytic leukemias, specifically FAB types M4 and M5. In particular, band 11q23 seems to be preferentially affected. Reported herein is a case of acute nonlymphocytic leukemia type M4 showing a t(1;11)(q21;q23).
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