title: [Immunohistochemical evaluation of topoisomerase IIalpha as proliferation factor in gastric lymphoma].
abstract: Topoisomerase IIalpha is a nuclear enzyme essential for DNA replication, with presumed prognostic value in various tumors.
  
  
  METHODS
  Study group included 34 gastric lymphomas. Tissue samples, formalin-fixed, paraffin-embedded, were investigated by immunhistochemistry using monoclonal antibodies anti Ki67 and anti topoisomerase IIalpha.
  
  
  RESULTS
  The 34 gastric lymphomas were previously diagnosed as follows: 14 MALT lymphoma and 20 aggressive lymphoma (17 diffuse large B-cell lymphoma, 2 diffuse large B-cell lymphoma with minor MALT component and 1 peripheral T-cell lymphoma). Both markers (Ki67 and topoisomerase IIalpha) were positive in 2-31% of tumor cells in MALT lymphoma, while in aggressive lymphoma up to 46-98% of tumor cells showed a positive expression.
  
  
  CONCLUSIONS
  Similar expression of Ki67 and topoisomerase IIalpha recommends the utilization of topoisomerase IIalpha in determining the proliferation fraction in gastric lymphomas. In addition, we suggest that it might be possible to use topoisomerase II inhibitor agents in high grade gastric lymphomas.
authors.affiliation: Serviciul de Anatomie Patologică si Prosectură, Spitalul Clinic de Urgenţă "Sf. Spiridon" Iaşi.
authors.forename: D
authors.initials: D
authors.lastname: Ferariu
authors.forename: M
authors.initials: M
authors.lastname: Danciu
authors.forename: Delia
authors.initials: D
authors.lastname: Ciobanu
authors.forename: F
authors.initials: F
authors.lastname: Zugun
authors.forename: Niculina
authors.initials: N
authors.lastname: Florea
authors.forename: Maria Sultana
authors.initials: MS
authors.lastname: Mihailovici
mesh_terms: D000951:Antigens, Neoplasm / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism*; D004250:DNA Topoisomerases, Type II / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000378:metabolism; D008223:Lymphoma / Q000145:classification / Q000201:enzymology* / Q000378:metabolism; D011379:Prognosis; D012189:Retrospective Studies; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000378:metabolism
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D019394:Ki-67 Antigen; D004250:DNA Topoisomerases, Type II