The distribution of hematogones by percent of total marrow events for 4 categories of bone marrow involvement by neoplastic cells.

There is a significant difference in mean percent hematogones between specimens without involvement by neoplastic cells (mean = 1.99%) and those with more than 50% (mean = 0.14%) and, also, between specimens with less than 25% involvement (mean = 1.53%) and those with more than 50%, P < .001.