PTEN gene mutations correlate to poor prognosis in glioma patients: a meta-analysis.

Background: We conducted this meta- analysis based on eligible trials to investigate the relationship between phosphatase and tensin homolog (PTEN) genetic mutation and glioma patients' survival. Methods: PubMed, Web of Science, and EMBASE were searched for eligible studies regarding the relationship between PTEN genetic mutation and glioma patients' survival. The primary outcome was the overall survival of glioma patient with or without PTEN genetic mutation, and second outcome was prognostic factors for the survival of glioma patient. A fixed-effects or random-effects model was used to pool the estimates according to the heterogeneity among the included studies. Results: Nine cohort studies, involving 1,173 patients, were included in this meta- analysis. Pooled results suggested that glioma patients with PTEN genetic mutation had a significant shorter overall survival than those without PTEN genetic mutation (hazard ratio [HR] = 2.23, 95% confidence interval [CI]: 1.35, 3.67; P=0.002). Furthermore, subgroup analysis indicated that this association was only observed in American patients (HR = 2.19, 95% CI: 1.23, 3.89; P=0.008), but not in Chinese patients (HR = 1.44, 95% CI: 0.29, 7.26; P=0.657). Histopathological grade (HR = 1.42, 95% CI: 0.07, 28.41; P=0.818), age (HR = 0.94, 95% CI: 0.43, 2.04; P=0.877), and sex (HR = 1.28, 95% CI: 0.55, 2.98; P=0.564) were not significant prognostic factors for the survival of patients with glioma. Conclusion: Current evidence indicates that PTEN genetic mutation is associated with poor prognosis in glioma patients. However, this finding is derived from data in observational studies, potentially subject to selection bias, and hence well conducted, high-quality randomized controlled trials are warranted.