title: Ewing's sarcoma--routine diagnostic utilization of MIC2 analysis: a Pediatric Oncology Group/Children's Cancer Group Intergroup Study.
abstract: Ewing's sarcoma and peripheral neuroectodermal tumor (PNET) are small blue cell tumors with no reliable positive diagnostic markers. However, Ewing's sarcoma and PNET recently have been shown to strongly express an antigen determined by the MIC2 gene, whereas other blue cell tumors of childhood for the most part do not. MIC2 analysis therefore offers a distinctive addition to the panel of immunohistochemical stains used to differentiate among small blue cell tumors of childhood, since it represents the first positive marker for Ewing's sarcoma and PNET. This study addresses the reliability of MIC2 analysis using the monoclonal antibody 12E7 on tumors registered in the current Intergroup Ewing's Sarcoma protocol. Of 244 tumors, 221 (91%) showed a diffuse strong membranous pattern. The antibody appears to withstand all the fixation variables inherent in a multi-institutional study. We conclude that MIC2 expression is highly reliable as a positive marker for the Ewing's sarcoma/PNET family of tumors when the results are interpreted in the total context with clinical and pathologic parameters.
authors.affiliation: Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD.
authors.forename: E J
authors.initials: EJ
authors.lastname: Perlman
authors.forename: P S
authors.initials: PS
authors.lastname: Dickman
authors.forename: F B
authors.initials: FB
authors.lastname: Askin
authors.forename: H E
authors.initials: HE
authors.lastname: Grier
authors.forename: J S
authors.initials: JS
authors.lastname: Miser
authors.forename: M P
authors.initials: MP
authors.lastname: Link
mesh_terms: D000071443:12E7 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor / Q000032:analysis; D001859:Bone Neoplasms / Q000737:chemistry / Q000175:diagnosis* / Q000473:pathology; D015815:Cell Adhesion Molecules / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007150:Immunohistochemistry; D008562:Membrane Glycoproteins / Q000032:analysis; D018241:Neuroectodermal Tumors, Primitive, Peripheral / Q000737:chemistry / Q000175:diagnosis / Q000473:pathology; D012042:Registries; D012512:Sarcoma, Ewing / Q000737:chemistry / Q000175:diagnosis* / Q000473:pathology
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; D008562:Membrane Glycoproteins