[Ag-negative phenomenon of nucleolar organizers of bone marrow and blood cells in children with acute lymphoblastic leukemia].

The activity of nucleoli-organizing (NOR's) regions was studied in leukemic cells of 53 children with immunologically typical ALL. The Ag-negative type of ALL was found in 9 cases of IA-ALL and Comm(+)-ALL. Dominating cells were not argentaffin. Some cytological peculiarities of Ag-negative cases have been demonstrated: lower presence of E(+)-receptor on circulating lymphoid cells, the greater number of cells with smooth surface which was revealed by the scanning electron microscopic method. The cases when the product of Ag-philic reaction was impossible to be revealed are discussed.