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Large gemistocytic cells are well-known elements of glial tumors. Recently, miniature gemistocytic cells and neoplastic glial fibrillary acidic protein (GFAP)-positive oligodendroglial cells, which are regularly seen in oligodendrogliomas, have been termed "transitional cells". The proliferative activity of the gemistocytic cell types and the GFAP-positive (gliofibrillary) oligodendrocytes was determined in eight astrocytomas, seven gemistocytic astrocytomas, eight glioblastomas, two monstrocellular glioblastomas, seven oligodendrogliomas and three mixed oligo-astrocytomas by immunohistochemical staining of the proliferation marker MIB-1 in combination with immunostaining for GFAP. Both large gemistocytic cells and the transitional cells showed cytoplasmic GFAP-positive staining. Neither in the classic gemistocytes nor in the minigemistocytes nuclear immunostaining for the MIB-1 antibody was observed. In contrast, MIB-1 staining was seen in the gliofibrillary oligodendrocytes. It is concluded that both large and miniature gemistocytic cell types contrast with gliofibrillary oligodendrocytes by their inability to proliferate.

acta neuropathologica

Proliferation of gemistocytic cells and glial fibrillary acidic protein (GFAP)-positive oligodendroglial cells in gliomas: a MIB-1/GFAP double labeling study