Table 1.

Proliferation Index (PI) in bizarre microvasculature (BM) of GBM.

	Type I BM	Type II BM
Overall PI	Mean 43.57 ± 9.5	Mean 3.41 ± 0.76
Pericyte PI	Mean 42.11 ± 5.76	Mean 1.12 ± 0.21
EC PI	Mean 0.88 ± 0.29	Mean 2.21 ± 0.88

Type I BM: Prominent, plump pericytes covering all EC abluminal surface (glomeruloid bodies, most of vascular garlands and ~50% of vascular clusters). Type II BM: Elongated, branched pericytes partially covering the EC abluminal surface (~50% vascular clusters and occasional vascular garlands). Pericyte PI/EC I in Type I BM: 42.11 (±5.76)/0.88 (±0.29). Pericyte PI in Type I BM/ Pericyte PI in Type II BM. 42.11 (±5.76)/1.12 (±0.21). p < 0.002. PI in Type I BM 47.85 times higher in pericytes than in ECs. PI in pericytes in Type I BM 37.59 higher than in Type II BM.