Researchers at the University of Waterloo have engineered bacteria to consume cancerous tumors from within, offering a potential latest approach to cancer treatment. The team, led by Professor Marc Aucoin of the Chemical Engineering Department, is utilizing Clostridium sporogenes, a bacterium commonly found in soil, to target and destroy malignant growths.
The strategy exploits the unique microenvironment within solid tumors. According to Dr. Aucoin, “Bacteria spores encounter an environment with plenty of nutrients and no oxygen within the tumor, which is perfect for the bacteria. So they initiate to eat and grow,” effectively dismantling the tumor tissue. The bacteria’s proliferation further accelerates the process of tumor degradation.
A key challenge lies in the bacteria’s vulnerability to oxygen. As the C. Sporogenes approach the outer edges of the tumor, they encounter oxygen and are killed before completing the process. Researchers are currently focused on overcoming this limitation to ensure complete tumor destruction.
The research builds on previous work exploring quorum sensing in bacteria. A recent study, co-authored by Aucoin, Sara Sadr, and Brian Ingalls, published in bioRxiv, details the successful engineering of Clostridium sporogenes with a quorum sensing system borrowed from Staphylococcus aureus. This allows for density-dependent gene regulation within the bacteria, potentially enhancing their effectiveness in targeting tumors.
The team’s work, highlighted in a February 2026 report from phys.org, demonstrates the feasibility of using engineered bacteria to selectively target and eliminate cancer cells. The approach centers on the bacterium’s ability to thrive in the oxygen-deprived core of solid tumors, a characteristic that distinguishes it from other potential therapeutic agents.
Researchers, including Dr. Brian Ingalls, and Dr. Sara Sadr, are continuing to refine the technique and explore its potential applications in various cancer types. Further research is planned to address the oxygen sensitivity issue and optimize the bacteria’s performance within the tumor microenvironment.
