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Apoptosis and Survival in High-grade Astrocytomas as Related to Tumor Fas (APO-1/CD95) Expression

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Abstract

Although a majority of high-grade gliomas express the apoptosis-inducing receptor Fas, little is known about the extent of apoptosis or prognostic significance of Fas expression in these tumors. In situ labeling of apoptotic cells and Ki-67 immunohistochemistry were performed on 51 high-grade human astrocytomas previously characterized for Fas expression. Survival data was compiled from patient records and correlated with tumor grade, apoptotic index (AI) and Fas expression. A significant correlation was found between tumor grade and the AI and Ki-67 labeling index (LI); however, only the AI increased significantly with Fas expression. The AI increased from 0.39 ± 0.12% to 0.82 ± 0.10% in grade III vs. IV astrocytomas (P = 0.003). The Ki-67-LI increased from 3.64 ± 1.5% to 11.35 ± 2.1% in grade III vs. IV astrocytomas (P = 0.004). Additionally, tumors expressing higher Fas levels had a greater AI than those expressing lower levels (0.81 ± 0.11% vs. 0.43 ± 0.11%) (P = 0.017). Despite longer median survivals for patients with tumors exhibiting high Fas expression, statistical significance was not achieved. Patients with grade III astrocytomas demonstrated a median survival of 20 vs. 18 months for tumors with high vs. low Fas expression (P = 0.51). Patients with grade IV astrocytomas demonstrated a median survival of 9 vs. 7.4 months for tumors with high vs. low Fas expression, respectively (P = 0.77). Although the degree of Fas expression in high-grade astrocytomas appears to correlate with the apoptotic rate, no overall differences in survival could be demonstrated between tumors expressing high vs. low Fas levels.

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Frankel, B., Longo, S.L., Leach, C. et al. Apoptosis and Survival in High-grade Astrocytomas as Related to Tumor Fas (APO-1/CD95) Expression. J Neurooncol 59, 27–34 (2002). https://doi.org/10.1023/A:1016329231461

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