Compare the target with the hematogone continuum

Hematogones are normal B-cell precursors that form a continuum: earlier cells commonly show CD34 and HLA-DR with CD19 and CD10, then progressively lose CD34 and CD10 while gaining CD20, brighter CD45, and surface immunoglobulin. A continuum is not a single fixed phenotype. Compare the case with internal maturation stages and locally validated normal distributions rather than calling any one antigen diagnostic.

Within the 43,347-event target gate, CD34 is positive in 41,613 events (96.000%) and is uniform bright; HLA-DR is positive in 40,746 (94.000%) and is uniform; CD19 is positive in 42,480 (98.000%) and is uniform bright; cytoplasmic CD79a is positive in 41,180 (95.001%); CD10 is positive in 39,446 (91.001%); CD20 is positive in 867 (2.000%); and surface immunoglobulin is positive in 0 (0.000%). Paired-marker plots in the target gate demonstrate CD19 with cytoplasmic CD79a and CD10 on the same events; that paired evidence, not the marginal values, supports the coexpression statement.

CD34 and HLA-DR support immaturity in this method. CD19 and cytoplasmic CD79a support B-lineage differentiation; CD10 supports precursor B-cell maturation context. Minimal CD20, dim CD45, and absent surface immunoglobulin fit an early precursor pattern. The relatively uniform CD34-bright, CD19-bright, CD10-positive population with minimal CD20 and absent surface immunoglobulin is not the expected broad hematogone continuum and is aberrant by asynchronous, constrained maturation; it still does not establish a final entity. Cytoplasmic MPO and cytoplasmic CD3 are negative in the target gate. Those negative findings do not independently exclude all myeloid, T-lineage, mixed-phenotype, or other alternatives; they only state what these two assays did not demonstrate.