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  • Küçük Resim
    Öğe
    Correlation between SPARC (Osteonectin) expression with immunophenotypical and invasion characteristics of pituitary adenomas
    (Blackwell Munksgaard, 2015) Onoz, Mustafa; Başaran, Recep; Güçlüer, Berrin; Işık, Nejat; Kaner, Tuncay; Sav, Aydın; Elmacı, İlhan
    Pituitary adenomas are the third most common intracranial tumors. Invasive adenomas account for only 0.1-0.2% of pituitary tumors. SPARC is a matrix glycoprotein that plays a role in progression and invasiveness of neoplasms. In this study, we examined the potential role of SPARC in invasive pituitary adenomas. Forty pituitary adenomas have been examined with histopathological and immunohistochemical techniques. The cohort has been classified into two groups as invasive (n = 25) and non-invasive (n = 15) utilizing the Hardy classification. Formalin fixed tissues have been stained with hematoxylin eosin. Ki-67, p53, and SPARC monoclonal antibodies have been used. We did not detect any significant difference on Ki-67, SPARC, and p53 expression patterns correlating with the pathological subtype or invasiveness. Only 24% of invasive adenomas had Ki-67 levels over 1%. A total of 67.7% non-invasive adenomas had Ki-67 levels below 1%. We did not detect any relation between SPARC levels and invasiveness of pituitary adenomas. Absence of significant SPARC expression in tumor progression, sellar dilatation, erosion and destruction suggest that SPARC scores are not related with invasiveness or progressiveness of pituitary adenomas.
  • Küçük Resim
    Öğe
    The role of a single nucleotide polymorphism of the matrix metalloproteinase-1 gene promoter region in invasion and prognosis of meningiomas
    (Turkish Neurosurgical Society, 2014) Efendioğlu, Mustafa; Başaran, Recep; Bayrak, Ömer Faruk; Işık, Nejat; Kaner, Tuncay; Şahin, Fikrettin; Güçlü, Bülent; Elmacı, İlhan
    AIM:The matrix metalloproteinase (MMP) enzyme family has been shown to be active in tumorigenesis and tumor progression. In this study, we analyzed the prevalence of a guanine insertion in the MMP-1 gene promoter region in meningiomas and its effect on invasion and prognosis. MATERIAL and METHODS: The study was performed with 33 meningioma patients. We also included 33 healthy patients in the study as a control group. The promoter area was amplified by polymerase chain reaction (PCR) following DNA isolation. The polymorphism was detected by restriction fragment length polymorphism (RFLP). RESULTS: According to the WHO classification of meningiomas, 87.9% of the affected patients were grade 1, and 12.1% were grade 2. In total, 72.7% of the meningioma patients (n=24) had at least one copy of the insertion (2G/1G or 2G/2G genotypes) and 27.3% (n=9) did not (1G/1G). There was no significant difference between the meningiorna and control groups according to genotype distribution. CONCLUSION: In this study, the polymorphism in the matrix metalloproteinase-1 gene promoter region did not have an effect on the initiation, growth and progression of meningioma.