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  • Title: Detection of residual disease in acute myeloid leukemia using light density gradients and culture assay.
    Author: Ciaudo M, Marie JP, Ifrah N, Thevenin D, Zittoun R.
    Journal: Pathol Biol (Paris); 1988 Jan; 36(1):67-71. PubMed ID: 3283676.
    Abstract:
    For monitoring the effect of chemotherapy in acute myeloid leukemia (AML), we attempt to detect minimal numbers of AML clonogenic cells (CFU-L) during remission using light density gradients combined with PHA-LCM methyl cellulose assay. Fifteen patients in complete remission (CR) of AML were studied: 8 patients with Auer Rods (AR+), and 7 without Auer Rods (AR-). The cluster/colonies ratio and the granulocytic maturation of cells from pooled colonies were not significantly different whatever the density cut used (1077, 1062 or 1059). In all the AR+ patients, few AR+ cells (.06% +/- .03) were observed in bone marrow cultures during remission, without differences between density gradients, but not before plating. These AR+ cells were not found in culture of AR- patient bone marrows nor in normal marrows. The serial studies performed in 6 patients (4 AR+, 2 AR-) were not contributive for relapse prediction. In 2 cases, the second examination failed to detect AR+ cells: one was performed after an autologous bone marrow transplantation and the other in a patient with prolonged CR (54+ months). A quantitative analysis of residual CFU-L with our technique requires a cytological examination of each colony, that is very time consuming and limits its routine use.
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