Table 1. Clinicopathological features of the tumor samples.

	Series 1	Series 2
Samples	Frozen	Paraffin
Number of samples	46	31
Age in years (range)	6 months-5 years	6 months-9 years
Stage
I	21	17
II	8	2
III	7	5
IV	4	2
Data not available	6	5
Risk
Low	2	0
Intermediate	15	24
High	8	7
Data not available	21	–
Subtype
Blastemal	11	4
Epithelial	8	5
Stromal	6	4
Others	21	18