[1] Hop St Antoine, F-75571 Paris, France
[2] Univ Penn, Abramson Canc Ctr, Philadelphia, PA 19104 USA
[3] Mayo Clin, Canc Ctr Stat, Rochester, MN USA
[4] Vall Hebron Univ Hosp, Med Oncol Serv, Barcelona, Spain
[5] Fdn ARCAD, Paris, France
[6] Univ Chicago, Div Biol Sci, Chicago, IL 60637 USA