04/16/2026
Over the past decade, Sunnybrook’s Cancer Ablation Therapy (CAT) program has reshaped how radiation treatment is delivered in Canada. What began as an ambitious vision to eliminate the surgical footprint for selected cancers has grown into Canada’s largest radiotherapy program.
Sunnybrook was the first in Canada to establish a dedicated CAT program, supported by advanced technologies including the Gamma Knife Icon, MR-Linac and MR-Guided Brachytherapy suite. Together, they enable highly targeted treatments that focus on tumours while limiting damage to healthy tissue.
The program is now evolving. In 2025, it was renamed the Cancer Ablation Adaptive Therapy (CA(A)T) program to reflect a stronger emphasis on real-time, responsive care. Teams can adjust treatment as needed based on how tumours change over time.
Learn more about how Sunnybrook is advancing radiation oncology: https://sunnybrook.ca/2026/04/10-years-of-cat-our-history-and-plans-to-push-forward/