The distribution of RAD51 levels across the GBM samples suggested that there may be two distinct clusters of RAD51 expression levels within this small but homogenously treated population of GBM patients (open circles in Figure 3); therefore, we grouped patients into high and low RAD51 expression groups based on whether or not each sample’s expression level was above or below the cohorts’ median value. This evidence concerns the gene RAD51 and glioblastoma.