Table 3.

Pathologic Findings of Specimens Obtained Before and After Chemotherapy

	Pre-Chemotherapy Pattern	Post-Chemotherapy Pattern
Inadequate Specimen	4 (1%)	4 (1%)
Blastemal Predominant	60 (16%)	17 (7%)
Epithelial Predominant	64 (17%)	17 (7%)
Stromal Predominant	6 (2%)	12 (4%)
Mixed Cell Wilms Tumor	133 (35%)	36 (14%)
Teratoid	5 (1%)	7 (3%)
Diffuse Anaplasia	7 (2%)	16 (6%)
Focal Anaplasia	2 (.05%)	3 (0.5%)
Not Coded	37(10%)	137 (52%)
Intralobar Nephrogenic Rests	50 (13%)	3 (0.5%)
Perilobar	6 (2%)	9 (3%)
Rest (Other)	2 (.05%)	5 (2%)