[Acute mixed-cell human leukemia]

The incidence rate of acute mixed-lineal leukemias, distinguished in a group of patients with acute non-lymphoblastic leukemia, in children and adults was about the same: CALLA 10-20%, T-cell antigens 15-22%, Thy-1 15-17%. The incidence rate of acute lymphoblastic leukemia with myeloid (17-21%) and erythroid (12-13%) antigens did not significantly differ in children and adults. Distinguishing features have been proposed for actual acute mixed-lineal leukemias having markers of mature stages of varying cell line differentiation from cryptic lineal-different-marker leukemias of bi- or polypotent precursor-cell origin.