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The immunophenotype of peripheral blood blast cells from 14 patients in the chronic phase of chronic myeloid leukemia (CML) was studied using a panel of monoclonal antibodies (McAb) directed against megakaryocytic, granulomonocytic, erythroid and lymphoid antigenic determinants. The blast cells were enriched by a simple bovine serum albumin (BSA) density-cut separation and cooled in liquid nitrogen. The study was done using the alkaline phosphatase-anti-alkaline phosphatase (APAAP) technique on the thawed blast cells. A consistent pattern of reactivity with McAb was found in all patients, showing that blast cells were heterogeneous. A minor component of the blast cells react with platelet antibodies, most of them being labelled with anti-GPIIb-IIIa McAb. Anti-GPIb and Von Willebrand factor McAb detected 4 times fewer megakaryocytic blast cells, suggesting that these cells are located very early in the differentiation scheme. Two major blast cell compartments were labelled with early myelomonocytic (anti-CD13: MY7) and early erythroid (anti-CD36: FA6-152) McAb. The CD34 (My10) and DR antigens which are expressed by immature blast cells and myeloid progenitors of human bone marrow (BM) were present on more than 50% of the CML blast cells. Thus, the blast cells of chronic phase CML patients, showed the same cellular diversity as the increased progenitor cell compartment observed in this disease, and their differentiation stages seemed to be very closely related.
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