Table I.

Clinical characteristics of favourable histology Wilms patients less than 2 years of age at diagnosis described by risk group, stage and final treatment regimen on NWTS 5

Risk group	Total Number	Number by treatment	5 yr EFS	95% Confidence intervals
Very Low (Stage I, tumor wt <550 gm)	198	N=122 EE4A N=76 no chemo	93%	89%, 96%
Low (Stage I > 550 gm, Stage II)	206	N=206 EE4A	87%	82%, 91%
Standard (Stage III, IV)	89	N= 9 EE4A N=80 DD4A	82%	72%, 89%

a. Age < 2 years at diagnosis (n= 493)