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Immunohistochemistry (IHC) has provided major insights about the classification of brain tumors by identifying cellular markers of phenotype and about tumor growth potential with nuclear markers of proliferation. In situ hybridization (ISH) research shows promise for diagnostic applications in tumor classification. The avidin-biotin conjugate IHC procedure is highlighted for diagnostic use on routinely processed clinical specimens. The immunophenotypes of brain tumors are tabulated in reference to their common IHC markers. Tumors that have been correctly classified by their IHC phenotypes include the giant-cell glioblastoma, primary brain lymphoma, and central neurocytoma. Phenotypes that may be more definitively detected by ISH, such as pituitary hormone, immunoglobulin light chain, and collagen messages are described. IHC of nuclear proliferation markers correlates with grade of malignancy, predicts tumor growth potential, and is prognostic for patient survival. The incorporation of bromodeoxyuridine, the expression of proliferating cell nuclear antigen, and the expression of Ki-67 antigen detected by MIB-1 antibody are compared in regard to their cell cycle activity and labeling index determinations. Fluorescence in situ hybridization (FISH) of brain tumor interphase nuclei and chromosomes is described. Abnormal FISH signals of specific chromosomes are associated with different types of brain tumors, with different grades of malignancy, and with mesenchymal drift of glioma cells in culture.

Insights About Brain Tumors Gained Through Immunohistochemistry and in Situ Hybridization of Nuclear and Phenotypic Markers