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Immunohistochemical staining. Absence of labeling with both Ext-Ab (A) and Int-Ab (B) in a glioblastoma. Strong EGFR expression with both Ext-Ab (C) and Int-Ab (D) in a glioblastoma. Discordant staining: strong with the Ext-Ab (E) and very weak with the Int-Ab (F) in a grade III oligodendroglioma. (G), table of statistical analysis.
