Stage IV adult sporadic Burkitt lymphoma/leukemia with complex bone marrow cytogenetics is associated with a very poor outcome

To the editor: Adult Burkitt lymphoma/leukemia (BLL) is a rare, aggressive B-cell neoplasm with typical morphologic appearances. It is characterized by rapid proliferation of mature B cells (Ki67/MIB-1 staining ≥ 99%) and overexpression of c -Myc, which most commonly results from the