Department of Tumor Biology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumor Biology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumor Biology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway. junbaiw@radium.uio.no|Department of Tumor Biology, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway. junbaiw@radium.uio.no