Expressions of AML1/ETO fusion gene and AML1/ETO9a isoform were detected by using reverse transcriptase-polymerase chain reaction (RT-PCR) in leukemia patients, MDS patients, leukemia cell lines and healthy subjects.     ///    "Among the 15 AML/ETO9a isoform expressing cases, 13 were demonstrated t(8;21) translocation and AML1/ETO expression. "    ///    "Isoform AML1/ETO9a was correlated to AML/M2, and it may promote the development of leukemia in combination with the AML1/ETO fusion gene.. "