Quorum‑gated tumor‑eating bacteria

Researchers engineered an obligate‑anaerobe (Clostridium sporogenes) to carry an oxygen‑tolerance gene that only turns on after quorum sensing detects a large bacterial population inside a tumor, letting the microbe survive long enough to consume tumor tissue while (in principle) avoiding oxygenated healthy tissue. The team validated the circuit with a fluorescent reporter in ACS Synthetic Biology and says clinical trials are the next goal. — If scalable, this approach could reshape cancer therapy options and force public discussion about clinical trials, biosafety rules for releasing engineered microbes into patients, and oversight for medical synthetic biology.