1Goodman Cancer Research Centre, McGill University, Montreal, Québec, QC H3A 1A3, Canada
2Department of Medicine, McGill University, Montreal, Québec, QC H3G 1Y6, Canada
3Genentech, 1 DNA Way, South San Francisco, CA 94080, USA
4Department of Physiology, McGill University, Montreal, Québec, QC H3G 1Y6, Canada
5Department of Developmental Biology and Cancer Research, Hebrew University-Hadassah Medical School, Jerusalem, Israel
6Department of Pathology and Microbiology, Université de Montréal, Saint Hyacinth, Québec, QC J2S 2M2, Canada
7Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada