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Clinical Chemistry 32: 787-791, 1986;
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Clinical Chemistry, Vol 32, 787-791, Copyright © 1986 by American Association for Clinical Chemistry

Radioimmunoassay of laminin in serum and its application to cancer patients

DG Brocks, H Strecker, HP Neubauer and R Timpl

In this sensitive radioimmunoassay for laminin fragment P1 (purified from pepsin extracts of human placenta), monovalent antibody fragments obtained from rabbit antisera against the laminin component are used. The inhibition assay showed a low intra- and interassay variability, and the inhibition curves for various serum samples had parallel slopes. Molecular-sieve chromatography demonstrated heterogeneity of the laminin antigen in serum. For quantification we defined arbitrary units based on the amount of antigenic material present in normal human serum. Sera from 361 tumor patients showed increased values in about half of the cases. Correlation with increased concentration of carcinoembryonic antigen was poor (r = 0.259). The assay may be useful for diseases involving basement-membrane metabolism.


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Copyright © 1986 by the American Association for Clinical Chemistry.