Abbreviations: AHWT, anaplastic histology Wilms tumor; CR, complete response; FHWT, favorable histology Wilms tumor; IR, incomplete response; LOH, combined loss of heterozygosity at chromosomes 1p and 16q; WT, Wilms tumor.
aExcept for patients with very low risk WT, as described in the text, who were candidates to receive no adjuvant therapy.