Compared to AA, CD133+ cells in GBM were significantly closer to both CD31+ blood vessels (by 4.96 μm p < 0.001, 95% CI 6.95–2.97 μm) and CD105+ blood vessels (by 9.22 μm p < 0.001, 95% CI 11.62–6.82 μm). Here, PECAM1 is linked to glioblastoma.