Surgery With or Without Neoadjuvant Chemotherapy in High Risk RetroPeritoneal Sarcoma

University of Alabama at Birmingham Cancer Center, Birmingham, Alabama, United States

Mayo Clinic Hospital in Arizona, Phoenix, Arizona, United States

City of Hope Comprehensive Cancer Center, Duarte, California, United States

UCI Health-Chao Family Comp CC and Ambulatory Care, Irvine, California, United States

UC San Diego Moores Cancer Center, La Jolla, California, United States

UC Irvine Health/Chao Family Comprehensive Ca Ctr, Orange, California, United States

UCHealth University of Colorado Hospital, Aurora, Colorado, United States

Smilow Cancer Hospital-Derby Care Center, Derby, Connecticut, United States

Smilow Cancer Hospital Care Center-Fairfield, Fairfield, Connecticut, United States

Smilow Cancer Hospital Care Center at Glastonbury, Glastonbury, Connecticut, United States

Smilow Cancer Hospital Care Center at Greenwich, Greenwich, Connecticut, United States

Smilow Cancer Hospital Care Center - Guiford, Guilford, Connecticut, United States

Smilow Cancer Hospital Care Ctr at Saint Francis, Hartford, Connecticut, United States

Yale University, New Haven, Connecticut, United States

Yale-New Haven Hospital North Haven Medical Center, North Haven, Connecticut, United States

Smilow Cancer Hospital Care Center at Long Ridge, Stamford, Connecticut, United States

Smilow Cancer Hospital Care Center-Trumbull, Trumbull, Connecticut, United States

Smilow Cancer Hospital-Waterbury Care Center, Waterbury, Connecticut, United States

Smilow Cancer Hospital Care Center - Waterford, Waterford, Connecticut, United States

Univ of Florida Health Science Ctr - Gainesville, Gainesville, Florida, United States

Mayo Clinic in Florida, Jacksonville, Florida, United States

Moffitt Cancer Center-International Plaza, Tampa, Florida, United States

Moffitt Cancer Center - McKinley Campus, Tampa, Florida, United States

Moffitt Cancer Center, Tampa, Florida, United States

Emory University Hospital Midtown, Atlanta, Georgia, United States

Northwestern University, Chicago, Illinois, United States

Rush University Medical Center, Chicago, Illinois, United States

University of Illinois at Chicago MBCCOP, Chicago, Illinois, United States

Indiana Univ/Melvin and Bren Simon Cancer Center, Indianapolis, Indiana, United States

University of Kansas Cancer Center, Kansas City, Kansas, United States

University of Kansas Cancer Center-Overland Park, Overland Park, Kansas, United States

University of Kansas Hospital-Westwood Cancer Ctr, Westwood, Kansas, United States

James Graham Brown Ca Ctr at Univ of Louisville, Louisville, Kentucky, United States

UofL Health Medical Center Northeast, Louisville, Kentucky, United States

LSU Health Baton Rouge-North Clinic, Baton Rouge, Louisiana, United States

Our Lady of The Lake Hospital, Baton Rouge, Louisiana, United States

Our Lady of the Lake Physician Group, Baton Rouge, Louisiana, United States

Johns Hopkins Univ/Sidney Kimmel Cancer Center, Baltimore, Maryland, United States

Dana-Farber/Harvard Cancer Center, Boston, Massachusetts, United States

University of Michigan Comprehensive Cancer Center, Ann Arbor, Michigan, United States

Sanford Joe Lueken Cancer Center, Bemidji, Minnesota, United States

Mayo Clinic, Rochester, Minnesota, United States

Siteman Cancer Center-West County, Creve Coeur, Missouri, United States

Washington University School of Medicine - Siteman Cancer Center, St Louis, Missouri, United States

Siteman Cancer Center-South Country, St Louis, Missouri, United States

Nebraska Medicine-Bellevue, Bellevue, Nebraska, United States

Nebraska Medicine-Bellevue, Omaha, Nebraska, United States

University of Nebraska Medical Center, Omaha, Nebraska, United States

Renown Regional Medical Center, Reno, Nevada, United States

Dartmouth Hitchcock Med Ctr/Dartmouth Cancer Ctr, Lebanon, New Hampshire, United States

Cooper Hospital University Medical Center, Camden, New Jersey, United States

HMH-Hackensack University Medical Center, Hackensack, New Jersey, United States

Jersey Shore University Medical Center, Neptune City, New Jersey, United States

Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey, United States

John Theurer Cancer Center at From Road, Paramus, New Jersey, United States

Roswell Park Cancer Institute, Buffalo, New York, United States

Northwell Health/Center for Advanced Medicine, Lake Success, New York, United States

North Shore University Hospital, Manhasset, New York, United States

NYU Langone Hospital - Long Island, Mineola, New York, United States

Long Island Jewish Medical Center, New Hyde Park, New York, United States

Laura and Issac Perlmutter Ca Ctr at NYU Langone, New York, New York, United States

University of Rochester, Rochester, New York, United States

Stony Brook University Medical Center, Stony Brook, New York, United States

Carolinas Medical Center/Levine Cancer Institute, Charlotte, North Carolina, United States

Duke University Medical Center, Durham, North Carolina, United States

Sanford Bismarck Medical Center, Bismarck, North Dakota, United States

Sanford Broadway Medical Center, Fargo, North Dakota, United States

Sanford Roger Maris Cancer Center, Fargo, North Dakota, United States

Ohio State University Comprehensive Cancer Center, Columbus, Ohio, United States

University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States

Oregon Health and Science University, Portland, Oregon, United States

Saint Vincent Hospital, Erie, Pennsylvania, United States

Jefferson Hospital, Jefferson Hills, Pennsylvania, United States

Forbes Hospital, Monroeville, Pennsylvania, United States

Allegheny Valley Hospital, Natrona Heights, Pennsylvania, United States

University of Pennsylvania/Abramson Cancer Center, Philadelphia, Pennsylvania, United States

Pennsylvania Hospital, Philadelphia, Pennsylvania, United States

Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, United States

Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States

Allegheny General Hospital, Pittsburgh, Pennsylvania, United States

West Penn Hospital, Pittsburgh, Pennsylvania, United States

UPMC Hillman Cancer Center, Pittsburgh, Pennsylvania, United States

Wexford Health and Wellness Pavilion, Wexford, Pennsylvania, United States

Rhode Island Hospital, Providence, Rhode Island, United States

Smilow Cancer Hospital Care Center - Westerly, Westerly, Rhode Island, United States

Sanford Cancer Center Oncology Clinic, Sioux Falls, South Dakota, United States

Sanford USD Medical Center - Sioux Falls, Sioux Falls, South Dakota, United States

University of Tennessee - Knoxville, Knoxville, Tennessee, United States

Vanderbilt University/Ingram Cancer Center, Nashville, Tennessee, United States

UT Southwestern/Simmons Cancer Center-Dallas, Dallas, Texas, United States

M D Anderson Cancer Center, Houston, Texas, United States

Huntsman Cancer Institute/University of Utah, Salt Lake City, Utah, United States

University of Vermont Medical Center, Burlington, Vermont, United States

Vermont Regional Cancer Center, Burlington, Vermont, United States

VCU Massey Cancer Center at Hanover Medical Park, Mechanicsville, Virginia, United States

VCU Massey Cancer Center at Stony Point, Richmond, Virginia, United States

Virginia Commonwealth Univ/Massey Cancer Center, Richmond, Virginia, United States

Carilion Roanoke Memorial Hospital, Roanoke, Virginia, United States

VCU Community Memorial Health Center, South Hill, Virginia, United States

FHCC South Lake Union, Seattle, Washington, United States

Fred Hutchinson Cancer Center, Seattle, Washington, United States

University of Washington Medical Center - Montlake, Seattle, Washington, United States

Marshfield Medical Center-EC Cancer Center, Eau Claire, Wisconsin, United States

Marshfield Medical Center, Marshfield, Wisconsin, United States

Medical College of Wisconsin, Milwaukee, Wisconsin, United States

Marshfield Medical Center, Minocqua, Wisconsin, United States

Marshfield Medical Center, Rice Lake, Wisconsin, United States

Marshfield Med Ctr-River Region at Stevens Point, Stevens Point, Wisconsin, United States

Marshfield Medical Center, Weston, Wisconsin, United States

Princess Alexandra Hospital - University Of Queensland, Woolloongabba, Queensland, Australia

Peter Maccallum Cancer Institute, Melbourne, Victoria, Australia

Chris O'Brian Life House - Chris O'Brien Lifehouse, Camperdown, Australia

BCCA - Vancouver Cancer Centre, Vancouver, British Columbia, Canada

London Regional Cancer Center, London, Ontario, Canada

The Ottawa Hospital - General Campus, Ottawa, Ontario, Canada

Hopital Maisonneuve Rosemont, Montreal, Quebec, Canada

The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada

Mount Sinai Hospital, Toronto, Canada

Bank Of Cyprus Oncology Centre, Stróvolos, Cyprus

Masaryk Memorial Cancer Institute, Brno, Czechia

University Hospital Motol, Prague, Czechia

Herlev Hospital - University Copenhagen, Herlev, Copenhagen, Denmark

Aarhus University Hospitals - Aarhus University Hospital-Skejby, Aarhus, Denmark

Centre Leon Berard, Lyon, France

Institut du Cancer de Montpellier, Montpellier, France

Institut Curie- Hopital de Paris, Paris, France

Hopitaux Universitaires de Strasbourg - Hautepierre, Strasbourg, France

Institut Gustave Roussy, Villejuif, France

Universitaetsmedizin Goettingen - Georg-August Universitaet, Goettigen, Lower Saxony, Germany

Universitaetsklinikum Carl Gustav Carus, Dresden, Germany

UniversitaetsMedizin Mannheim, Mannheim, Germany

Centro Di Riferimento Oncologico, Aviano, Italy

IRCCS - Fondazione Piemonte Inst di Candiolo, Candiolo, Italy

IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) "Dino Amadori", Meldola, Italy

IRCCS - Istituto Nazionale dei Tumori, Milan, Italy

Istituto Clinico Humanitas, Milan, Italy

Istituto Europeo di Oncologia, Milan, Italy

IRCCS - Istituto Oncologico Veneto, Padova, Italy

Policlinico Universitario Campus Bio-Medico- Oncology Center, Roma, Italy

Kyushu University Hospital, Higashiku, Fukuoka, Japan

Yokohama City University Hospital, Yokohama, Kanagawa, Japan

Kanagawa Cancer Center, Yokohama, Kanagawa, Japan

Tohoku University Hospital, Sendai, Miyagi, Japan

Aichi Cancer Center, Chikusa-ku, Nagoya, Japan

Nagoya University Hospital, Shōwaku, Nagoya, Japan

Niigata University Medical and Dental Hospital, Niigata, Niigata, Japan

Okayama University Hospital, Kita-ku, Okayama-ken, Japan

Osaka International Cancer Institute, Chuo-ku, Osaka, Japan

National Cancer Center Hospital, Chuo-ku, Tokyo, Japan

Cancer Institute Hospital of JFCR, Koto-ku, Tokyo, Japan

Saitama Medical Center, Jichi Medical University, Saitama, Japan

The Netherlands Cancer Institute-Antoni Van Leeuwenhoekziekenhuis, Amsterdam, Netherlands

Leiden University Medical Centre, Leiden, Netherlands

Radboudumc - Radboud University Medical Center Nijmegen, Nijmegen, Netherlands

Maria Sklodowska-Curie Memorial Cancer Centre - Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland

National Cancer Institute, Bratislava, Slovakia

Hospital De La Santa Creu I Sant Pau, Barcelona, Spain

Institut Catala d'Oncologia - ICO Badalona - Hospital Germans Trias i Pujol, Barcelona, Spain

Hospital General Universitario Gregorio Maranon, Madrid, Spain

Hospital Universitario Fundacion Jimenez Diaz, Madrid, Spain

Hospital Universitario San Carlos, Madrid, Spain

University Hospitals Birmingham - Queen Elisabeth Medical Centre, Birmingham, United Kingdom

NHS Greater Glasgow and Clyde - Beatson West of Scotland Cancer Centre - Gartnavel General Hospital, Glasgow, United Kingdom

Leeds Teaching Hospitals NHS Trust - St. James's University Hospital, Leeds, United Kingdom

the Royal Marsden Hospital, London, United Kingdom

Clatterbridge cancer center, Metropolitan Borough of Wirral, United Kingdom

Newcastle Hospitals - Freeman Hospital, Northern Centre For Cancer Care, Newcastle, United Kingdom

Nottingham University Hospitals NHS Trust - City Hospital, Nottingham, United Kingdom

Oxford University Hospitals NHS Trust - Churchill Hospital, Oxford, United Kingdom