CD 54 expression and its role in homotypic aggregation of the blasts of acute myeloblastic leukemias (AML).

CD 54 (ICAM-1) expression was studied on blasts of 13 cases of de-novo AML prior to and after stimulation by interferon-gamma (IFN-gamma). Furthermore, its functional activity was studied by analysis of the influence of CD 54 on homologous interaction of the blasts. Prior to culture only a minority of the blasts displayed CD 54 positivity.

Pseudoreticulocytosis in a patient with myelodysplasia.

A patient with a myelodysplastic syndrome (MDS) and reticulocytosis of > 50% in the absence of a correspondingly increased erythrocyte turnover is reported. Evaluation of the kinetics of erythrocyte turnover revealed a decreased erythrocyte life span of 44 days. From these data a prolongation of the reticulocyte maturation time to > 20 days can be concluded.

A new technical approach for the ultrastructural analysis of hematopoietic cells using cell monolayers adherent to electron-transparent melamine resins.

The melamine resin is a polymer of a hexamethylol melamine ether which can coat glass slides with an electron-transparent foil (approximately 80 nm thick) after polymerization by p-toluene sulphonic acid and warming. Provided that the cells had been resuspended in a serum-free medium, normal peripheral blood, or bone marrow cells, blasts of different acute leukemias, cells of B-cell chronic lymphocytic leukemia, and of the cell-lines K562, KG1a, and HL-60 became adherent to the melamine-resin-covered glass slides. The optimal sedimentation time and cell concentration was 45 min and 10(7) cells/ml, respectively.

Once-daily versus thrice-daily dosing of netilmicin in combination with beta-lactam antibiotics as empirical therapy for febrile neutropenic patients.

In a prospective, randomized trial, netilmicin given once daily (OD) was compared in terms of efficacy and safety with the conventional 8-hourly dosing regimen (TD), both in combination with a broad spectrum beta-lactam, as initial empirical therapy for febrile neutropenic patients; the total daily dosage of netilmicin in each group was 6 mg/kg body weight. Twenty-nine of the 116 (25%) evaluable patients had microbiologically documented septicaemia, most of which were caused by Gram-positive bacteria, 41 (35%) had microbiologically documented infection without bacteraemia and 46 (40%) had possible infection. Highest peak serum concentrations of netilmicin in the OD group were significantly higher and trough serum concentrations significantly lower than in the TD group.