title: [Application of the in situ hybridization with EWS dual-color break-apart fluorescence probe and anti-CD99 and anti-FLI-1 antibodies in the diagnosis of Ewing's sarcoma/primitive neuroectodermal tumor].
abstract: OBJECTIVE
  To investigate the value of using EWS dual-color, break-apart rearrangement probe fluorescence in situ hybridization (FISH) technique, CD99 and FLI-1 antibodies immunohistochemistry in the diagnosis of Ewing's sarcoma/primitive neuroectodermal tumor (EWS/PNET).
  
  
  METHODS
  Thirty-five cases of EWS/PNET and 24 cases of non-EWS/PNET small round cell tumor were analyzed by FISH and immunohistochemically detected with FLI-1 and CD99 antibodies. Comparison between FISH and immunohistochemical results was carried out and their diagnostic value was evaluated.
  
  
  RESULTS
  The sensitivity, specificity, positive predictive value and negative predictive value of FISH in EWS/PNET were 93.8%(30/32), 81.8%(18/22), 88.2%(30/34) and 90%(18/20); those of CD99 were 100%(35/35), 58.3% (14/24), 77.8%(35/45) and 100%(14/14); those of FLI-1 were 71.4%(25/35), 62.5%(15/24), 73.5%(25/34), 60%(15/25), respectively. The sensitivity, specificity, positive predictive value and negative predictive value of combined use of CD99 and FLI-1 were 71.4%(25/35), 75%(18/24), 80.6%(25/31) and 64.3%(18/28), those of combined use of FLI-1 and FISH were 68.7%(22/32), 86.4%(19/22), 88%(22/25) and 65.5%(19/29), those of combined use of CD99 and FISH were 93.7%(30/32), 95.5%(21/22), 96.8%(30/31) and 91.3%(21/23), respectively.
  
  
  CONCLUSIONS
  EWS dual-color, break-apart rearrangement probe FISH is a highly sensitive and specific technique in the diagnosis of EWS/PNET. The combination of CD99 and FISH is the method of choice for the diagnosis of EWS/PNET. The combination of CD99 and FLI-1 can improve the specificity in EWS/PNET without the data of FISH.
authors.affiliation: Department of Pathology, Peking University School of Basic Medical Sciences, Beijing, China.
authors.forename: Bao-yue
authors.initials: BY
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Yang
authors.forename: Juan
authors.initials: J
authors.lastname: DU
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Zheng
mesh_terms: D000071443:12E7 Antigen; D000911:Antibodies, Monoclonal / Q000276:immunology; D000912:Antibodies, Neoplasm / Q000276:immunology; D015703:Antigens, CD / Q000276:immunology*; D014408:Biomarkers, Tumor / Q000032:analysis / Q000235:genetics; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology; D015815:Cell Adhesion Molecules / Q000276:immunology*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D008840:Microfilament Proteins / Q000276:immunology*; D018241:Neuroectodermal Tumors, Primitive, Peripheral / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology; D011237:Predictive Value of Tests; D034802:RNA-Binding Protein EWS / Q000276:immunology*; D018160:Receptors, Cytoplasmic and Nuclear / Q000276:immunology*; D012512:Sarcoma, Ewing / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology; D012680:Sensitivity and Specificity; D015534:Trans-Activators
chemical_list: D000071443:12E7 Antigen; D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D015703:Antigens, CD; D014408:Biomarkers, Tumor; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; C098179:FLII protein, human; D008840:Microfilament Proteins; D034802:RNA-Binding Protein EWS; D018160:Receptors, Cytoplasmic and Nuclear; D015534:Trans-Activators