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[Cancer Research 63, 6962-6970, October 15, 2003]
© 2003 American Association for Cancer Research

Regular Articles

Prognostic Value of Epidermal Growth Factor Receptor in Patients with Glioblastoma Multiforme1

Naoki Shinojima2, Kenji Tada, Shoji Shiraishi, Takanori Kamiryo, Masato Kochi, Hideo Nakamura, Keishi Makino, Hideyuki Saya, Hirofumi Hirano, Jun-ichi Kuratsu, Koji Oka, Yasuji Ishimaru and Yukitaka Ushio

Departments of Neurosurgery [N. S., K. T., S. S., T. K., M. K., H. N., K. M., Y. U.] and Tumor Genetics and Biology [H. S.], Kumamoto University School of Medicine, Kumamoto 860-8556 and 860-0811; Neurosurgery, Kagoshima University School of Medicine, Kagoshima 890-8520 [H. H., J-i. K.]; Neurosurgery, Nakamura Memorial Hospital, Sapporo 060-8570 [K. O.]; and Division of Pathology, Kumamoto University College of Medical Science, Kumamoto 862-0976 [Y. I.], Japan

Glioblastoma multiforme (GBM) frequently involves amplification and alteration of the epidermal growth factor receptor (EGFR) gene, resulting in overexpression of varied mutations, including the most common mutation, EGFRvIII, as well as wild-type EGFR (EGFRwt). To test the prognostic value of EGFR, we retrospectively analyzed the relationship between treatment outcomes and the EGFR gene in 87 newly diagnosed adult patients with supratentorial GBM enrolled in clinical trials. The EGFR gene status was assessed by Southern blots and EGFR expression by immunohistochemistry using three monoclonal antibodies (EGFR.25 for EGFR, EGFR.113 for EGFRwt, and DH8.3 for EGFRvIII). EGFR amplification was detected in 40 (46%) of the 87 GBM patients; in 39 (97.5%) of these, EGFR was overexpressed. On the other hand, in 46 of 47 patients without EGFR amplification (97.9%), no EGFR overexpression was present. There was a close correlation between EGFR amplification and EGFR overexpression (P < 0.0001). EGFRwt was overexpressed in 27 of the 40 (67.5%) patients with, and in none without, EGFR amplification (P < 0.0001). Similarly, EGFRvIII was overexpressed in 18 (45.0%) of 40 patients with and in 4 (8.5%) of 47 patients without EGFR amplification (P < 0.0001). The finding that 8 (20%) of the patients with EGFR amplification/EGFR overexpression manifested overexpression of neither EGFRwt nor EGFRvIII indicates that they overexpressed other types of EGFR. Multivariate analysis demonstrated that EGFR amplification was an independent, significant, unfavorable predictor for overall survival (OS) in all patients (P = 0.038, HR = 1.67). With respect to the relationship of age to EGFR prognostication, the EGFR gene status was a more significant prognosticator in younger patients, particularly in those <60 years (P = 0.0003, HR = 3.15), whereas not so in older patients. EGFRvIII overexpression, on the other hand, was not predictive for OS. However, in patients with EGFR amplification, multivariate analysis revealed that EGFRvIII overexpression was an independent, significant, poor prognostic factor for OS (P = 0.0044, HR = 2.71). This finding indicates that EGFRvIII overexpression in the presence of EGFR amplification is the strongest indicator of a poor survival prognosis. In GBM patients, EGFR is of significant prognostic value for predicting survival, and the overexpression of EGFRvIII with amplification plays an important role in enhanced tumorigenicity.




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