title: Matrix metalloproteinase-2 and matrix metalloproteinase-9 expressions correlate with the recurrence of intracranial meningiomas.
abstract: BACKGROUND
  We studied whether or not the expressions of MMP-2 and MMP-9 were correlated with the proliferative potential or recurrence of intracranial meningiomas.
  
  
  METHODS
  The expressions of MMP-2 and MMP-9 of 56 meningioma tissues were examined and scored by immunohistochemistry (IHC). Expressions of the mRNA of each MMP were also examined by reverse transcriptase polymerase chain reaction (RT-PCR) assay in 15 cases. The relationships between IHC score and each of age, sex, tumor location, histology, MIB-1 labeling index (LI), and recurrence or regrowth rate were studied.
  
  
  RESULTS
  Nine of 56 cases showed recurrence or regrowth. IHC revealed that MMP-2 was highly expressed in 13 of 56 cases, whereas MMP-9 was highly expressed in 22 of 56 cases. Among the 15 cases analyzed by RT-PCR assay, MMP-2 and MMP-9 were expressed in 9 and 13 cases, respectively. Based on the Kaplan-Meier curve, the high expressions of MMPs were related to recurrence/regrowth (MMP-2: p < 0.001; MMP-9: p < 0.05). No significant relationship was observed between the expressions of MMPs and either age, sex, tumor location, or MIB-1 LI.
  
  
  CONCLUSIONS
  Our study indicated that MMP-2 and MMP-9 expressions are prognostic factors predicting the recurrence of meningioma, independent of proliferative potential.
authors.affiliation: Department of Neurological Surgery, Kagawa Medical University, Kita County, Kagawa, Japan. neuron@kms.ac.jp
authors.forename: Masaki
authors.initials: M
authors.lastname: Okada
authors.forename: Keisuke
authors.initials: K
authors.lastname: Miyake
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kawai
authors.forename: Katsuzo
authors.initials: K
authors.lastname: Kunishio
authors.forename: Seigo
authors.initials: S
authors.lastname: Nagao
mesh_terms: D000368:Aged; D002455:Cell Division; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D008577:Meningeal Neoplasms / Q000201:enzymology* / Q000473:pathology; D008579:Meningioma / Q000201:enzymology*; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000201:enzymology* / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016019:Survival Analysis
chemical_list: D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9