[1] Weill Cornell Med Coll, Dept Radiat Oncol, New York, NY 10065 USA
[2] Sandra & Edward Meyer Canc Ctr, New York, NY 10065 USA
[3] Univ Paris Descartes Paris V, F-75006 Paris, France
[4] Univ Roma Tor Vergata, Dept Biol, Rome, Italy
[5] Regina Elena Inst Canc Res, Rome, Italy
[6] Univ Cattolica Sacro Cuore, Inst Gen Pathol, Rome, Italy