Researchers have developed engineered probiotic bacteria that can locate tumors and produce cancer-fighting drugs directly inside them. The new approach could open a path toward more precise cancer treatments.

The study was led by scientists from Shandong University in Qingdao, China. Their findings were published in the scientific journal PLOS Biology.

Cancer treatment often faces major challenges because tumors can be difficult to target without damaging healthy tissue. Traditional chemotherapy spreads drugs throughout the body. As a result, many treatments cause significant side effects.

The researchers explored whether microbes already used as probiotics could help solve this problem. Their goal was to turn bacteria into “living drug factories” capable of delivering therapy directly to tumors.

Scientists said the approach could allow cancer drugs to act exactly where they are needed.

🔬 Probiotic Bacteria Modified to Produce Cancer Drug

The research team focused on a probiotic strain called Escherichia coli Nissle 1917 (EcN). Scientists often use this bacterium in medical research because it can safely live inside the human body.

Researchers genetically engineered the bacteria so it could produce romidepsin, an anticancer compound already approved for medical use.

To test the idea, scientists created a mouse model with breast cancer tumors. They then introduced the modified bacteria into the animals.

Laboratory experiments showed that the bacteria could enter tumors and release the drug directly at the tumor site. This process allowed the treatment to target cancer cells more precisely.

Consequently, the approach could potentially reduce damage to healthy tissues compared with traditional therapies.

🧪 Experiments Show Targeted Drug Delivery

During the experiments, the engineered bacteria accumulated inside tumors in both laboratory and animal tests. Once inside the tumor environment, the microbes produced romidepsin and released it locally.

The researchers described the system as a dual-action cancer therapy. First, the bacteria naturally move toward tumor tissue. Second, they produce a drug that attacks cancer cells directly.

This combination allows the treatment to deliver medication exactly where it is needed.

Scientists say the results demonstrate how engineered microbes could support a new generation of targeted cancer treatments.

⚠️ Human Testing Still Needed

Although the findings are promising, researchers emphasized that the therapy has not yet been tested in humans. Additional studies will be required before the treatment could be considered for clinical use.

Future research must also examine potential side effects and determine how doctors could safely remove the bacteria after treatment.

These factors will play an important role in determining whether engineered probiotics can become a practical cancer therapy.

🌍 New Direction for Precision Cancer Treatment

Scientists believe the study provides a strong foundation for bacteria-assisted cancer therapies. By combining engineered microbes with existing anticancer drugs, researchers may be able to develop treatments that target tumors more effectively.

The findings also highlight the growing role of synthetic biology and microbiome research in medicine.

If future studies confirm the results, engineered probiotic bacteria could eventually become part of a new generation of precision cancer treatments designed to attack tumors from within.