PURPOSE: This study explores whether meningioma expresses epidermal growth factor receptor (EGFR) and determines if there is a correlation between the WHO grade of this tumor and the degree of EGFR expression. METHODS: Following institutional review board approval, 113 meningioma specimens from 89 patients were chosen. Of these, 85 were used for final analysis. After a blinded review, immunohistochemical stains for EGFR were performed. Staining intensity (SI) was scored on a scale 0-3 (from no staining to strong staining). Staining percentage of immunoreactive cells (SP) was scored 1-5 (from the least to the maximum percent of the specimen staining). Immunohistochemical score (IHS) was calculated as the product of SI and SP. RESULTS: Eighty-five samples of meningioma were classified in accordance with World Health Organization (WHO) criteria: benign 57/85 (67%), atypical 23/85 (27%), and malignant 5/85 (6%). The majority of samples demonstrated a moderate SI for EGFR. IHS for EGFR demonstrated a significant association between SI and histopathologic subtype. Also, there was a correlation between the SP and histopathologic subtype (p = 0.029). A significant association was determined when the benign and the atypical samples were compared to the malignant with respect to the SP (p = 0.009). While there was a range of the IHS for the benign and the atypical histologic subtypes, malignant tumors exhibited the lowest score and were statistically different from the benign and the atypical specimens (p < 0.001). CONCLUSIONS: To our knowledge, this represents the largest series of meningioma samples analyzed for EGFR expression reported in the literature. EGFR expression is greatest in benign meningiomas and may serve a potential target for therapeutic intervention with selective EGFR inhibitors.
PURPOSE: This study explores whether meningioma expresses epidermal growth factor receptor (EGFR) and determines if there is a correlation between the WHO grade of this tumor and the degree of EGFR expression. METHODS: Following institutional review board approval, 113 meningioma specimens from 89 patients were chosen. Of these, 85 were used for final analysis. After a blinded review, immunohistochemical stains for EGFR were performed. Staining intensity (SI) was scored on a scale 0-3 (from no staining to strong staining). Staining percentage of immunoreactive cells (SP) was scored 1-5 (from the least to the maximum percent of the specimen staining). Immunohistochemical score (IHS) was calculated as the product of SI and SP. RESULTS: Eighty-five samples of meningioma were classified in accordance with World Health Organization (WHO) criteria: benign 57/85 (67%), atypical 23/85 (27%), and malignant 5/85 (6%). The majority of samples demonstrated a moderate SI for EGFR. IHS for EGFR demonstrated a significant association between SI and histopathologic subtype. Also, there was a correlation between the SP and histopathologic subtype (p = 0.029). A significant association was determined when the benign and the atypical samples were compared to the malignant with respect to the SP (p = 0.009). While there was a range of the IHS for the benign and the atypical histologic subtypes, malignant tumors exhibited the lowest score and were statistically different from the benign and the atypical specimens (p < 0.001). CONCLUSIONS: To our knowledge, this represents the largest series of meningioma samples analyzed for EGFR expression reported in the literature. EGFR expression is greatest in benign meningiomas and may serve a potential target for therapeutic intervention with selective EGFR inhibitors.
Authors: Magnus B Arnli; Thomas Backer-Grøndahl; Borgny Ytterhus; Unn S Granli; Stian Lydersen; Sasha Gulati; Sverre H Torp Journal: PeerJ Date: 2017-03-29 Impact factor: 2.984
Authors: Michael Orth; Kirsten Lauber; Maximilian Niyazi; Anna A Friedl; Minglun Li; Cornelius Maihöfer; Lars Schüttrumpf; Anne Ernst; Olivier M Niemöller; Claus Belka Journal: Radiat Environ Biophys Date: 2013-10-20 Impact factor: 1.925
Authors: Mateusz Bujko; Paulina Kober; Andrzej Tysarowski; Ewa Matyja; Tomasz Mandat; Wiesław Bonicki; Janusz Aleksander Siedlecki Journal: Oncol Lett Date: 2014-04-07 Impact factor: 2.967
Authors: Rickey Miller; Michele L DeCandio; Yaenette Dixon-Mah; Pierre Giglio; W Alex Vandergrift; Naren L Banik; Sunil J Patel; Abhay K Varma; Arabinda Das Journal: J Neurol Neurosurg Date: 2014