During admission, another bone marrow biopsy was obtained, which indicated persistent B-ALL (75% blasts in a 75% cellular marrow with the immunophenotype CD10, CD19, CD22, CD34, CD58, CD79a, and TdT+) with a background of erythroid and myeloid dysplasia. The gene discussed is CD58; the disease is precursor B-cell acute lymphoblastic leukemia.