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A number of fixation and decalcification procedures were evaluated to determine their suitability for immunohistochemistry on trephine samples of bone marrow after paraffin embedding. In particular, the immunoreactivity of antigens characteristic for various hematopoietic cell lines (immunoglobulin heavy and light chains for plasmacytoid cells; elastase for neutrophil myeloid cells; lysozyme, alpha-1-antitrypsin and alpha-1-antichymotrypsin for hystiocytic cells; leukocyte common antigen for lymphocytes; hemoglobin and glycophorin A for erythroid cells; Factor VIII-related antigen for thrombocytoid cells) as well as some antigens specific for epithelial tumors (CEA, 115D8, and keratin) were investigated. Fixation in a mercuric chloride-formaldehyde mixture followed by decalcification in acetic acid-formaldehyde-saline proved to be the best procedure for antigen preservation and retention of morphologic detail. Moreover, there is no need of trypsinization when using this procedure. The only exception was Factor VIII-related antigen in megakaryocytes, which was best demonstrated in trypsin-digested sections of formalin-fixed and acetic acid-decalcified biopsies.

Influence of fixation and decalcification on the immunohistochemical staining of cell-specific markers in paraffin-embedded human bone biopsies.