title: Immunohistochemical staining patterns of canine meningiomas and correlation with published immunophenotypes.
abstract: This study examined immunohistochemical staining patterns for several meningioma variants involving either the brain or spinal cord of dogs. Formalin-fixed, paraffin-embedded tissue from 15 tumors was obtained. The selected tumor group included seven meningothelial, three transitional, two malignant (anaplastic), one myxoid, one papillary, and one osteomatous meningiomas. Tumors were evaluated for reactivity to the following six immunohistochemical markers: vimentin, pancytokeratin, glial fibrillary acidic protein (GFAP), S100, neuron-specific enolase (NSE), and synaptophysin. Vimentin expression was detected in all meningiomas, and 14 of 15 tumors demonstrated intense vimentin staining in more than 50% of the neoplastic cells. Pancytokeratin expression was present in 11 of 15 neoplasms; however, positive staining frequently was focal and often involved a small percentage of the neoplastic cells. GFAP expression was detected in a single, anaplastic meningioma. Although expression of NSE and S100 was detected in 12 of 25 meningiomas, the intensity of the staining and the percentage of positive neoplastic cells was highly variable. Synaptophysin was uniformly negative. These results will help to establish immunohistochemical profiles for meningiomas that will improve our ability to correctly differentiate these neoplasms of meningeal origin from central nervous system tumors originating from other sites.
authors.affiliation: Department of Veterinary Pathobiology, Texas A&M University, College of Veterinary Medicine, College Station 77833-4457, USA. kbarnhart@cvm.tamu.edu
authors.forename: K F
authors.initials: KF
authors.lastname: Barnhart
authors.forename: J
authors.initials: J
authors.lastname: Wojcieszyn
authors.forename: R W
authors.initials: RW
authors.lastname: Storts
mesh_terms: D000818:Animals; D001932:Brain Neoplasms / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D016543:Central Nervous System Neoplasms / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D004283:Dog Diseases / Q000378:metabolism / Q000473:pathology*; D004285:Dogs; D005260:Female; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D007150:Immunohistochemistry / Q000662:veterinary; D016130:Immunophenotyping; D007633:Keratins / Q000378:metabolism; D008297:Male; D008579:Meningioma / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D010751:Phosphopyruvate Hydratase / Q000378:metabolism; D009418:S100 Proteins / Q000378:metabolism; D016708:Synaptophysin / Q000378:metabolism; D014746:Vimentin / Q000378:metabolism
chemical_list: D005904:Glial Fibrillary Acidic Protein; D009418:S100 Proteins; D016708:Synaptophysin; D014746:Vimentin; D007633:Keratins; D010751:Phosphopyruvate Hydratase