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Supratentorial glioblastoma in adults: Identification of subsets and their clinical correlation

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Abstract

The concept of different genetic pathways leading to glioblastoma multiforme (GBM) has gained considerable acceptance, and two major groups are now described, primary or de novo GBM and secondary GBM. The present study was undertaken to elucidate whether additional pathways exist and to determine whether there is any correlation between these different variants and clinical parameters, such as age, duration of symptoms, and outcome. For this purpose, immunophenotyping was performed to study the simultaneous expression of p53 protein and epidermal growth factor receptor (EGFR) in 58 cases of adult supratentorial GBM. By this method, four variants of GBM could be distinguished: 34% were p53 positive only, 38% were EGFR positive only, 14% were double negative (p53 negative/EGFR negative), and 14% were double positive (p53 positive/EGFR positive). Interestingly, all nine cases of secondary GBM in which there was clinical and histological evidence of progression from a preexisting low-grade lesion were p53 positive. Differences were observed with regard to the age distribution of the four variants, in that the p53 negative/EGFR negative tumors occurred most frequently in the younger age group (21–40 years). In the elderly group (61–80 years), two-thirds of the tumors were p53 negative/EGFR positive primary GBMs, and no case of the double positive or double negative variant was encountered. The differences in duration of symptoms and symptom-free survival according to age group and genetic subset were not statistically significant. There were no differences in outcome within each age category for any GBM variant, although the longest mean symptom-free survival was noted among patients aged 41–60 years with the p53 positive/EGFR negative variant. This study therefore indicates that at least four subsets of GBM exist, but despite different genotypes, the biologic behavior remains similar. Other genetic alterations therefore need to be investigated to identify prognostic makers.

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Correspondence to Chitra Sarkar.

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Sarkar, C., Sinha, S., Sharma, M.C. et al. Supratentorial glioblastoma in adults: Identification of subsets and their clinical correlation. Brain Tumor Pathol 21, 7–12 (2004). https://doi.org/10.1007/BF02482170

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  • DOI: https://doi.org/10.1007/BF02482170

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