The majority of adult AML samples show greater than normal myeloid cell levels of BCL-2 protein expression, as measured by immunostaining and flow cytometry. Data derived from 43 adult AML samples are displayed. Percents BCL-2–positive cells were determined after indirect immunofluorescent staining of myeloid cells with an anti–BCL-2 monoclonal antibody as described in Fig 4. Data, including AML ranges and median values and control myeloid cell ranges, are presented as in Fig 3.