[1] Ohio State Univ, Coll Med, Columbus, OH 43210 USA
[2] Duke Univ, CALGB Stat Ctr, Durham, NC 27706 USA
[3] Mt Sinai Med Ctr, Div Med Oncol, New York, NY USA
[4] Univ Chicago, Chicago, IL 60637 USA
[5] Long Isl Jewish Med Ctr, Div Hematol Oncol, New Hyde Pk, NY 11042 USA
[6] Canc & Leukemia Grp B, Chicago, IL USA