title: [Primary diffuse large B-cell lymphoma of central nervous system belongs to activated B-cell-like subgroup: a study of 47 cases].
abstract: OBJECTIVE
  To investigate the histogenetic origin of primary central nervous system diffuse large B-cell lymphoma (DLBCL) with respect to the stage of B-cell differentiation, and identification of the relevant prognostic markers.
  
  
  METHODS
  Immunohistochemical staining (EnVision method) for CD10, bcl-6, MUM-1, CD138 and FOXP1 antigens was performed on 47 paraffin-embedded sections.
  
  
  RESULTS
  CD10, bcl-6, MUM-1 and FOXP1 expression in the tumor cells were 6.4%, 53.2%, 91.5% and 93.6% respectively. There was no expression of CD138 in all the cases. Among the 47 patients, 43 cases (91.5%) showed an activated B-cell-like (ABC) phenotype: 21 (44.7%) were bcl-6+ and MUM-1+, suggesting an "activated germinal center (GC) B-cell-like" in origin; 22 (46.8%) were exclusively MUM-1+, suggesting an "activated non-GCB" in origin. No significant correlation of the classification and FOXP1 expression found on the outcome (P=0.279 and P=0.154).
  
  
  CONCLUSIONS
  Most primary central nervous system DLBCL are shown belonging to the ABC subgroup, suggesting that primary central nervous system DLBCL is quite similar to a DLBCL subset, which is derived from late GC to early post-GC B cell. The classification and FOXP1 expression do not show prognostic value in primary central nervous system DLBCL.
authors.affiliation: Department of Pathology, Nanjing University Medical College/Nanjing General Hospital of Nanjing Command, Nanjing 210002, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Cheng
authors.forename: Pin
authors.initials: P
authors.lastname: Tu
authors.forename: Qun-li
authors.initials: QL
authors.lastname: Shi
authors.forename: Hang-bo
authors.initials: HB
authors.lastname: Zhou
authors.forename: Zhi-yi
authors.initials: ZY
authors.lastname: Zhou
authors.forename: You-cai
authors.initials: YC
authors.lastname: Zhao
authors.forename: Heng-hui
authors.initials: HH
authors.lastname: Ma
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001402:B-Lymphocytes / Q000473:pathology; D014408:Biomarkers, Tumor / Q000032:analysis; D002490:Central Nervous System; D016543:Central Nervous System Neoplasms / Q000175:diagnosis*; D005260:Female; D006801:Humans; D016393:Lymphoma, B-Cell / Q000175:diagnosis* / Q000378:metabolism; D016403:Lymphoma, Large B-Cell, Diffuse / Q000175:diagnosis* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor