Department of Tumour Biology, Norwegian Radium Hospital, N0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumour Biology, Norwegian Radium Hospital, N0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumour Biology, Norwegian Radium Hospital, N0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumour Biology, Norwegian Radium Hospital, N0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumour Biology, Norwegian Radium Hospital, N0310 Oslo, Norway. junbaiw@radium.uio.no