NCT03213691 2025-02-05Selumetinib Sulfate in Treating Patients With Relapsed or Refractory Advanced Solid Tumors, Non-Hodgkin Lymphoma, or Histiocytic Disorders With Activating MAPK Pathway Mutations (A Pediatric MATCH Treatment Trial)National Cancer Institute (NCI)Phase 2 Completed21 enrolled 11 charts