[1] European Inst Oncol, Div Med Oncol, Dept Med, I-20141 Milan, Italy
[2] Int Breast Canc Study Grp Coordinating Ctr, Bern, Switzerland
[3] Oncol Inst So Switzerland, Bellinzona, Switzerland
[4] Dana Farber Canc Inst, Dept Biostat & Computat Biol, Int Breast Canc Study Grp Stat Ctr, Boston, MA 02115 USA
[5] Frontier Sci & Technol Res Fdn Inc, Boston, MA USA