This MLL-SEPT11 fusion is cytogenetically indistinguishable from the recurrent t(4;11)(q21;q23).     ///    This report expands the spectrum of ALL-related translocations and hypothesizes on the mechanism leading to the MLL-SEPT11 fusion.     ///    "Reverse transcriptase-polymerase chain reaction revealed expression of a chimeric MLL-SEPT11 transcript, thus identifying what is to our knowledge a hitherto undescribed translocation in ALL. "