TNFSF4 and glioblastoma: The univariate Cox proportional hazard model showed that higher OX40L expression levels were associated with longer PFS in patients with glioblastoma (n = 110), although the difference was not statistically significant (Hazard Ratio per log-relative OX40L expression, 0.898; 95% confidence interval, 0.775–1.041; P = 0.155).