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For inquiries about the WOO Network or its trials, or to discuss a potential WOO trial concept, please contact: WOONetwork@oicr.on.ca
What we do
The Window-of-Opportunity (WOO) Network is a joint effort by surgical, medical and radiation oncologists along with Ontario’s cancer research community to carry out clinical trials on patients who haven’t yet received any treatment, before they go through cancer surgery.
Why we do it
WOO trials help scientists understand if and how an emerging cancer treatment can affect tumour cells and a patient’s immune cells. By learning from each WOO trial and comparing the results across trials, our Network can help bring new treatments to patients sooner.
How we do it
WOO trials are conducted before patients receive any other therapy, including surgery. They focus on evaluating the effectiveness and mechanism of action in new therapies. Results are analyzed rigorously and compared with evidence from other WOO trials, helping advance innovative treatments so they can ultimately improve outcomes and quality of life for patients.
The WOO Network was formed in 2020 under the guidance of a multidisciplinary steering committee. Prioritized WOO studies are provided with funding and support for trial development, translational analysis and knowledge dissemination and leverage OICR’s powerful and standardized multi-omic capabilities. The WOO Network builds study capacity in Ontario through mentorship of new investigators, industry partnerships, data analytics and shared network expertise. The current focus of the WOO Network is to identify agents that rapidly modulate and enhance the immune response in cancer patients.

The results of WOO trials can help researchers to:
Importance of WOO trials in cancer research:


The WOO Network provides: