Atezolizumab With or Without Cobimetinib in Treating Patients With Metastatic Bile Duct Cancer That Cannot Be Removed by Surgery or Gallbladder Cancer

Memorial Sloan Kettering Cancer Center, New York

University of Pittsburgh Cancer Institute (UPCI), Pittsburgh

Thomas Jefferson University Hospital, Philadelphia

MedStar Georgetown University Hospital, Washington D.C.

Johns Hopkins University/Sidney Kimmel Cancer Center, Baltimore

University of Virginia Cancer Center, Charlottesville

Virginia Commonwealth University/Massey Cancer Center, Richmond

UNC Lineberger Comprehensive Cancer Center, Chapel Hill

Duke University Medical Center, Durham

Emory University Hospital Midtown, Atlanta

Emory University Hospital/Winship Cancer Institute, Atlanta

University of Florida Health Science Center - Gainesville, Gainesville

Moffitt Cancer Center, Tampa

Vanderbilt University/Ingram Cancer Center, Nashville

Ohio State University Comprehensive Cancer Center, Columbus

Case Western Reserve University, Cleveland

Wayne State University/Karmanos Cancer Institute, Detroit

Washington University School of Medicine, St Louis

Siteman Cancer Center-South County, St Louis

Siteman Cancer Center at Christian Hospital, St Louis

Siteman Cancer Center at West County Hospital, Creve Coeur

Siteman Cancer Center at Saint Peters Hospital, City of Saint Peters

UCHealth University of Colorado Hospital, Aurora

City of Hope Comprehensive Cancer Center, Duarte

City of Hope South Pasadena, South Pasadena

University of California Davis Comprehensive Cancer Center, Sacramento

Smilow Cancer Hospital-Derby Care Center, Derby

Smilow Cancer Hospital Care Center-Fairfield, Fairfield

Smilow Cancer Hospital Care Center - Guilford, Guilford

Smilow Cancer Hospital Care Center at Saint Francis, Hartford

Smilow Cancer Center/Yale-New Haven Hospital, New Haven

Yale University, New Haven

Yale-New Haven Hospital North Haven Medical Center, North Haven

Smilow Cancer Hospital-Torrington Care Center, Torrington

Smilow Cancer Hospital Care Center-Trumbull, Trumbull

Smilow Cancer Hospital-Waterbury Care Center, Waterbury

Massachusetts General Hospital Cancer Center, Boston

Brigham and Women's Hospital, Boston

Beth Israel Deaconess Medical Center, Boston

Dana-Farber Cancer Institute, Boston

Rutgers Cancer Institute of New Jersey, New Brunswick