Dr. Siu is a senior medical oncologist at Princess Margaret Cancer Centre, where she is also the director of the Phase 1 of its clinical trials program, co-director of the Bras and Family Drug Development Program, and clinical leader for the Tumor Immunotherapy Program. She is also a professor of medicine at the University of Toronto and previously served a four-year term (2012-2016) on the board of directors at the American Society of Clinical Oncology (ASCO) and a three-year (2017-2020) term for the American Association for Cancer Research (AACR).  

Dr. Siu’s major research focus is in the area of new anticancer drug development, particularly with respect to phase I trials and head and neck malignancies. She was the recipient of the US National Cancer Institute Michaele C. Christian Award in Oncology Drug Development in 2010, and has been awarded the Targeted Anticancer Therapies 2020 Honorary Award for contributions in the development of anticancer drugs. In addition, she has published over 370 peer-reviewed manuscripts and is currently the co-editor-in-chief for AACR’s newest journal Cancer Research Communications.