FIG 5. The estimated survival function using the Cox proportional hazards model and the mean value covariate pattern (days to recurrence, net tumor volume) for hypervascular and hypovascular tumors shows survival in 39 patients (those whose angiographic data were available) with recurrent primary brain tumors treated with selective intra-arterial chemotherapy. The y-axis shows percentage of patients surviving. The x-axis shows survival in days. Patients with angiographic findings of hypovascularity are represented by the upper line. Those with angiographic findings of vascularity are represented by the lower line