BACKGROUND: Wilms' tumor WT affects one in 10,000 children and accounts for 5 of all childhood cancers. Although the overall relapse rate for children with WT has decreased to less than 15 , the overall survival for patients with recurrent disease remains poor at approximately 50 . The aim of the study to evaluate the outcome of relapsed Wilms' tumor pediatric patients treated at the National Cancer Institute NCI , Egypt, between January 2008 and December 2015. ...