EGFR and glioblastoma: They found that, at a cut-off value of >10% tumour cells with staining, 77% of the cases were EGFR positive, and the EGFR positivity was associated with significantly poorer survival in both the univariate and multivariate analysis [55] In another study, again using the same antibody 31G7, Tini and colleagues investigated the EGFR expression in 144 glioblastoma patients who had undergone postoperative radiochemotherapy.