One dose of a frog-gut bacterium completely eliminated colorectal tumors in every treated mouse. Not merely shrank them. Complete response. The bacterium, Ewingella americana, multiplied roughly 3,000-fold inside the tumors within 24 hours. It attacked cancer cells directly while recruiting T cells, B cells, and neutrophils. In the experiment, it outperformed four doses of anti-PD-L1 immunotherapy and liposomal doxorubicin. Then researchers rechallenged the cured mice with the tumor: 0/10 developed tumors. 10/10 untreated mice did. The bacterium disappeared from the bloodstream within 24 hours and wasn’t detected in healthy organs. It’s one small mouse study, not a human cancer cure. But the concept is remarkable: a living drug that finds the tumor, multiplies inside it, destroys it, and potentially teaches the immune system to remember. In the foreseeable future, we will cure all cancers.