Abstract
An insulin-resistant diabetic patient who also has chronic lymphocytic leukemia and very high plasma levels of free and total insulin along with high levels of insulin antibodies is described. In response to prednisone therapy, his insulin requirement decreased, but the total and free insulin concentrations increased as insulin antibody measured as the maximal insulin-binding capacity of plasma remained unchanged. In insulin resistance, persistent hyperglycemia, in spite of high levels of immunoreactive free insulin, presumably reflects peripheral tissue unresponsiveness to insulin. The beneficial effect of prednisone treatment in this patient is discussed, and it is postulated to be the result of either increased availability of free insulin or an increased responsiveness of the tissues to insulin or both.
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