Resumo

MARSAN SUAREZ, Vianed et al. Biological and clinical characterization of pediatric patients with pro-B acute lymphocytic leukemia. Rev Cubana Hematol Inmunol Hemoter [online]. 2006, vol.22, n.2, pp. 0-0. ISSN 1561-2996.

The biological and clinical characteristics of 19 children with pro-B acute lymphocytic leukemia were studied during 14 years. The cellular immunophenotyping was performed by the immunocytochemical ultramicrornethod. A higher incidence was observed in a group aged 2-5 years old. The distribution by race was the same as in the normal population. The white boys were the most affected. 73.7 % of the patients presented leukocytes < 20x10 9 /L at the onset of the disease, and 57.9 % had hepatomegaly and splenomegaly. Adenopathies and hemorrhagic manifestations were observed in 47.4 % and in 2 %, respectively. The CD19 antigen was expressed in 100 % of the patients, the CD22 plasmatic antigen in 89.5 %, the Tdt enzyme in 68.4 % and HLA-DR in 57.9 %. Of the total of studied patients, 4 (21 %) expressed myeloid antigens and were classified as pro-B LLA-Mi+. The expressed myeloid antigens were CD13 and CD33 (5.3 %) in a patient, and CD15 in 2 patients (10.5 %). These results show that LLA is a heterogenous disease with different biological and clinical subtypes

Palavras-chave : Pro-B acute lymphocytic leukemia.