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Tumor volume at the time of diagnosis and after preoperative chemotherapy (n=154) of patients with non-metastatic unilateral Wilms tumor and local stage III treated according to the consecutive SIOP/GPOH trials and studies 9, 93-01 and 2001. The difference is statistically highly significant (P<0.001). Mean tumor volume at diagnosis: 608±436 mL, mean tumor volume after pre-operative chemotherapy: 315±366 mL.
