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Abstract
Serum and urine proteins were analysed by means of gel electrophoresis and immunoelectrophoresis in 12 patients with urinary tract tumours, 13 patients with glomerulonephritis, and 12 patients with pyelonephritis. Immunoglobulins (Ig A, Ig G, and Ig M) and transferrin were determined by means of immunological techniques. The clearance value of each protein or protein fraction was determined and expressed in relation to the albumin clearance. The tumour patients had a high excretion of immunoglobulins, especially Ig M, and a low excretion of alfa-1-globulin and transferrin compared with the other patients. The origin of proteinuria in patients with urinary tract tumours is discussed. In such patients the study of protein excretion may be of diagnostic value.