Nivolumab With or Without Ipilimumab in Treating Younger Patients With Recurrent or Refractory Solid Tumors or Sarcomas

NYP/Columbia University Medical Center/Herbert Irving Comprehensive Cancer Center, New York

Children's Hospital of Pittsburgh of UPMC, Pittsburgh

Children's Hospital of Philadelphia, Philadelphia

Children's National Medical Center, Washington D.C.

National Institutes of Health Clinical Center, Bethesda

Children's Healthcare of Atlanta - Egleston, Atlanta

Children's Hospital of Alabama, Birmingham

Saint Jude Children's Research Hospital, Memphis

Cincinnati Children's Hospital Medical Center, Cincinnati

Riley Hospital for Children, Indianapolis

C S Mott Children's Hospital, Ann Arbor

Children's Hospital of Wisconsin, Milwaukee

University of Minnesota/Masonic Cancer Center, Minneapolis

Lurie Children's Hospital-Chicago, Chicago

Washington University School of Medicine, St Louis

Baylor College of Medicine/Dan L Duncan Comprehensive Cancer Center, Houston

Children's Hospital Colorado, Aurora

Children's Hospital Los Angeles, Los Angeles

Children's Hospital of Orange County, Orange

UCSF Medical Center-Mission Bay, San Francisco

Lucile Packard Children's Hospital Stanford University, Palo Alto

Oregon Health and Science University, Portland

Seattle Children's Hospital, Seattle

Dana-Farber Cancer Institute, Boston

Hospital for Sick Children, Toronto