Acute biphenotypic leukaemia (myeloid and null‐ALL type) supervening in a myelodysplastic syndrome

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Abstract
Summary. An acute leukaemia was seen in a 72–year‐old patient with a myelodysplastic syndrome (MDS) of 14 months duration, who had been treated only with steroids. The morphological appearance of the blast cells suggested a poorly differentiated cell type. Surface marker analysis, including double staining studies, showed the coexistence of a population of null acute lymphoblastic leukaemia (ALL) blast cells together with acute myeloid leukaemia type cells. No chromosomal alterations were detected.The change from a chronic MDS to an acute leukaemia of mixed (myeloid and null ALL) type suggests either transformation of a pre‐existing abnormal clone or de novo appearance of two separate leukaemic clones.