[1] Princess Margaret Hosp, Univ Hlth Network, Toronto, ON M4X 1K9, Canada
[2] Cross Canc Inst, Edmonton, AB T6G 1Z2, Canada
[3] Juravinski Canc Ctr, Hamilton, ON, Canada
[4] McGill Univ, Ctr Hlth, Montreal, PQ, Canada
[5] Princess Margaret Hosp, Toronto, ON M4X 1K9, Canada
[6] NCI, Canc Therapy Evaluat Program, Bethesda, MD 20892 USA