A new strategy uses genetically programmed bacteria to detect when enough of them have gathered inside a tumor – then switch on survival mechanisms at just the right moment. Credit: Shutterstock
By University of WaterlooApril 7, 2026
Researchers are exploring an unconventional cancer treatment that uses engineered bacteria to target the unique, oxygen-free environments inside tumors.
A research team led by the University of Waterloo is developing a new way to treat cancer by engineering bacteria that can consume tumors from the inside.
“Bacteria spores enter the tumor, finding an environment where there are lots of nutrients and no oxygen, which this organism prefers, and so it starts eating those nutrients and growing in size,” said Dr. Marc Aucoin, a chemical engineering professor at Waterloo. “So, we are now colonizing that central space, and the bacterium is essentially ridding the body of the tumor.”
The approach relies on Clostridium sporogenes, a bacterium commonly found in soil that can grow only in completely oxygen-free conditions.
The center of a solid cancerous tumor is made up of dead cells and lacks oxygen, creating an ideal environment for this bacterium to thrive and multiply.
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