Table 2.

Ki67 proliferation index versus NWTS staging.

Stage of tumor	Epithelial	Mean	Blastema	Mean	Average
I (n = 16)	14–46	30	24–68	46	38
II (n = 12)	32–40	36	66–82	74	55
III (n = 2)	60		78		69
IV (n = 1)	76		82		79
V	0