Interferon Alfa With or Without Isotretinoin in Treating Patients With Metastatic Kidney Cancer

Institut Jules Bordet, Brussels

National Institute of Oncology, Budapest

Algemeen Ziekenhuis Middelheim, Antwerp

Kantonspital Aarau, Aarau

Ospedale di Circolo e Fondazione Macchi, Varese

Marmara University Hospital, Istanbul

Russian Academy of Medical Sciences Cancer Research Center, Moscow

Onze Lieve Vrouw Ziekenhuis Aalst, Aalst

Universitair Ziekenhuis Antwerpen, Edegem

U.Z. Gasthuisberg, Leuven

Groot Ziekengasthuis 's-Hertogenbosch, 's-Hertogenbosch

Antoni van Leeuwenhoekhuis, Amsterdam

Academisch Medisch Centrum, Amsterdam

Leiden University Medical Center, Leiden

University Medical Center Nijmegen, Nijmegen

University Hospital - Rotterdam Dijkzigt, Rotterdam

Rotterdam Cancer Institute, Rotterdam

Academisch Ziekenhuis Utrecht, Utrecht

Norwegian Radium Hospital, Oslo

Ospedale San Giovanni, Bellinzona

Inselspital, Bern, Bern

Ratisches Kantons und Regionalspital, Chur

Centre Hospitalier Universitaire Vaudois, Lausanne

Kantonsspital - Saint Gallen, Sankt Gallen

Universitaetsspital, Zurich

Bristol Royal Infirmary, Bristol

Beatson Oncology Centre, Glasgow