RecruitingPhase 2Drug trialA Study of Selinexor in People With Wilms Tumors and Other Solid TumorsThe purpose of this study is to find out whether selinexor is an effective treatment for people who have a relapsed/refractory Wilms tumor, rhabdoid tumor, MPNST, BCOR-driven sarcoma, or another solid tumor that makes a higher than normal amount of XPO1 or has genetic changes that increase the activity of XP01.