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Table 3: Number of samples of each WHO grade^{^a}
Sample Grade No. of Samples Cell Density (Mean) (SD)
Normal^{^b} 3 1777 [SD, 371]
II 39 5790 [SD, 2667]
II/III 3 6085 [SD, 2022]
III^{^c} 2 2584, 14,634
IV 5 11,547 [SD, 4252]
↵a The grade of a sample is not necessarily the same as the patient’s clinical grade. As expected, the cell density of the samples increases with increasing sample grade.
↵b These samples appeared histologically tumor-free but showed Ki-67-positive endothelial cells.
↵c Because only 2 samples were grade III, the values are listed.

Sample Grade	No. of Samples	Cell Density (Mean) (SD)
Normal^{^b}	3	1777 [SD, 371]
II	39	5790 [SD, 2667]
II/III	3	6085 [SD, 2022]
III^{^c}	2	2584, 14,634
IV	5	11,547 [SD, 4252]