[Analysis of clinical, pathological features and therapeutic treatments in predicting prognosis of elderly glioblastomas].

Objective: This study was designed to investigate prognostic factors and the potential relationship between the expression of Ki67 and IDH of glioblastoma in the elderly (≥ 65 years old) and the clinical factors such as gender, the KPS score and treatments including surgical resection, radiotherapy and chemotherapy and the prognosis of such patients. Methods: Fifty-four elderly patients (≥ 65 years old) with glioblastoma admitted to the First Affiliated Hospital of Zhengzhou University from 2013 to 2018 were enrolled in this study. The expression of Ki67 was detected by immunohistochemical SP method and the mutation of IDH was detected by Sanger sequencing. Finally, statistical analysis was performed to determine whether Ki67, the mutation of IDH, gender, the KPS score and the extent of resection, radiotherapy and chemotherapy were associated with the clinical prognosis of the patients. Results: Of the 54 elderly patients with glioblastoma, none was detected with IDH mutation. Univariate analysis showed that Ki67( P= 0.033), the KPS score ( P= 0.008), the extent of resection ( P< 0.001) were factors influencing the prognosis of elderly patients with glioblastoma. Patients receiving postoperative adjuvant radiotherapy ( P= 0.002) and chemotherapy ( P= 0.034) had longer survival time. There was no significant correlation between gender ( P= 0.467) and prognosis. Multivariate analysis demonstrated that radiotherapy ( OR 2.446, P= 0.009) and the extent of resection ( OR 6.976, P< 0.001) were independent prognostic factors. Conclusions: No IDH mutation was detected in all the patients in this study, indicating that IDH mutation is indeed rare in elderly glioblastoma, which suggests that geriatric population often harbor a molecular phenotype with poor prognosis. Ki67, KPS score, the extent of resection, radiotherapy and chemotherapy were the factors influencing the prognosis of patients.