PROGNOSTIC RELEVANCE OF EPIDERMAL GROWTH-FACTOR RECEPTOR (EGF-R) AND C-NEU ERB2 EXPRESSION IN GLIOBLASTOMAS (GBMS)

Seventeen untreated primary adult glioblastomas were analyzed using im munocvtochemistry for the expression of EGF-R, c-neu/erbB2, TGF-alpha, and phosphotyrosine. Patients were divided by median survival into lo ng-term or short-term survivors (LTS, N = 10, median > 4 years; versus STS, N = 7, median 61 weeks). There were no significant differences b etween the two groups in terms of age, extent of resection, post-opera tive Karnofsky status, or treatment. Diagnostic sections from each tum or were stained with antibodies to EGF-R, c-neu/erbB2, TGF-alpha and p hosphotyrosine. Double-labelling for TGF-alpha and EGF-R was also perf ormed. All 10/10 LTS were considered to be EGF-R negative/scant, while 4/7 STS were EGF-R positive. EGF-R negativity significantly correlate d with long-term survival. The differences ih c-neu/erbB2 expression d id not reach significance. However, 4/7 STS were positive for both pro teins and 76% of the 17 cases were either double negative or positive for EGF-R and c-neu/erbB2. TGF-alpha and phosphotyrosine were frequent ly expressed, but neither were prognostic. Recurrent tumors were studi ed in 7 STS. EGF-R expression was increased in 4/7 of these cases and c-neu/erbB2 was increased in all 7 cases, compared to the pretreatment baselines. Increased expression of these proteins in glioblastomas ma y be associated with aggressive clinical behavior and treatment resist ance.