Four out of 10 MLL / AF4 transcript types' e10-e4, e11-e4, e9-e4, and e9-e5 were detected. The E2A / PBX1 fusion gene has 2 transcript types, in that, the transcript forming by breakpoint region at exon 13 của E2A and exon 2 PBX1 is common, standing by 94.1%.