Translocation 11q23 and MLL gene rearrangements are commonly observed in acute myeloid leukemia (AML) in association with the myelomonocytic or monocytic feature. We describe a case involving a 15-year-old patient with AML characterized by leukemic cells exhibiting translocation (11;17)(q23;q12-21) and MLL gene rearrangement. No fusion partner gene of the MLL gene was identified, including RARalpha(17q12) or AF17 (17q21); however, a partial tandem duplication of the MLL exon 11/exon 10 was detected in leukemic cells via a 3'RACE method for detection of unknown partner genes. The patient has been in remission for more than 2 years without hematopoietic stem cell transplantation.
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