Tim Whelan (IMAGE) McMaster University Caption Tim Whelan, lead author of the study, a professor in the Department of Oncology at McMaster University and the Canada Research Chair in Breast Cancer Research. Whelan is also a radiation oncologist at Hamilton Health Sciences. Credit McMaster University Usage Restrictions Use with credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.