The immunogold-silver staining (IGSS) method is a new immunostaining technique with much enhanced sensitivity for demonstration of antigens in paraffin sections. A series of 10 non-Hodgkin's lymphomas of B cell type were stained for surface membrane immunoglobulins by the IGSS and peroxidase-antiperoxidase (PAP) methods using paraffin sections and polyclonal primary antisera. The resulting staining patterns were compared with those obtained using frozen sections of the same tissues, monoclonal antibodies and the immunoperoxidase technique. The IGSS method gave a clear demonstration of surface membrane immunoglobulins in neoplastic lymphocytes using paraffin sections and the pattern of staining achieved was comparable to that obtained by the immunoperoxidase technique employing frozen sections and monoclonal antibodies. PAP staining of paraffin sections consistently failed to demonstrate the presence of any surface membrane immunoglobulin. The IGSS method provides a new approach to the diagnosis of B cell lymphomas in which routinely fixed and processed tissues may be employed to demonstrate monoclonality.
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