From the Department of Medical Oncology and Radiotherapy, Norwegian Radium Hospital, Oslo, Norway; St Antonius Hospital, Nieuwegein, and Netherlands Cancer Hospital, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands; San Raffaele, Milan, Italy; Freeman Hospital, Newcastle, and Princess Royal Hospital, Hull, United Kingdom; and European Organization for Research and Treatment of Cancer Data Center, Brussels, Belgium. (At 2001-01-01)