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Cytogenetic study revealed multiple oligoclonal abnormalities: 47,XY,inv(6)(p23q21),+21c[3]/47,XY,der(7)t(1;7)(q25;p15),+21c[1]/47,XY,del(13)(q?),+21c[1]/47,XY,+21c[15]. Ten months after the patient achieved remission, the transient abnormal myelopoiesis evolved to an acute megakaryoblastic leukemia. Cytogenetic study revealed only a single clonal abnormality, 47,XY,der(7)t(1;7)(q25;p15),+21c, identical to one of the structural changes seen at birth. Sequence analysis of the GATA1 gene revealed a deletion-insertion mutation within the exon 2 introducing a stop codon after Arg 64. It may be that the der(7)t(1;7)(q25;p15) abnormality played some selective role in the development of acute megakaryoblastic leukemia in this patient. To our knowledge, the present case is unique in demonstrating a subclone with der(7)t(1;7)(q25;p15) evolving to acute leukemia."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380567181982918914","@type":"Researcher","foaf:name":[{"@value":"Toshiyuki Kitoh"}]},{"@id":"https://cir.nii.ac.jp/crid/1380567181982918912","@type":"Researcher","foaf:name":[{"@value":"Tomohiko 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