CORE--SEPARATING NORMAL/LEUKEMIC CELLS IN MARROW/PERIPHERAL BLOOD IN AML PATIENTS

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Marrow myeloid cells can be separated into classes which exhibit different self-renewal capabilities carrying morphological features with respect to maturation and differing immunophenotype. The greater the self-renewal potential, the less frequent are these cells. Fluorescent activated cell sorting (FACS) has been used to develop populations of early myeloid cells which are enriched with the phenotype CD34+CD38-Lin-Thy-1 +(lo)Rho(lo). These cells have been shown to have high proliferative potential. Some AML cells show negativity for the Thy-1+lo phenotype. The t(15; 17) AML subset has been shown to be negative for CD34+CD33- cells. This data has suggested to some that the good prognosis AML subsets do not penetrate into the early myeloid compartment, whereas the poor prognostic subsets may contain cells with the immunophenotype CD34+CD38-CD33-Thy-1(lo). We will test this hypothesis by using high speed FACS cell sorting to develop populations of cells from AML patients which have the CD34+CD38- Lin-Thy+1(lo)Rho(lo) phenotype and then test this by FISH and PCR for evidence of AML cells.