[1] Princess Margaret Hosp, Div Hematol & Med Oncol, Toronto, ON M4X 1K9, Canada
[2] Royal Marsden Hosp, Dept Biochem, London SW3 6JJ, England
[3] Womens Coll Hosp, Dept Biochem, Toronto, ON M5S 1B2, Canada
[4] Sunnybrook Med Ctr, Dept Biochem, Toronto, ON, Canada
[5] Mt Sinai Hosp, Dept Pathol, Toronto, ON M5G 1X5, Canada
[6] Sunnybrook Med Ctr, Div Med Oncol, Toronto, ON, Canada