Bacteria Used to br Destroy Cancer Tumors br in Mice The study was published br in the journal Nature Medicine. Scientists genetically br reprogrammed bacteria br to create "nanobodies." Nanobodies can be thought br of as small, more potent br versions of antibodies. Antibodies attach to br proteins on cancer cells to br help the immune system br recognize the cells as dangerous. Bacteria use cancer cells br to colonize and as protection br from the human immune system. The modified bacteria br were injected into tumors, br and then began to multiply and br produce the tumor fighting nanobodies. The bacteria also "uncloaked" br the cancer cells, engaging br the immune system in the br fight against the tumors. If the method works in humans, br scientists are hopeful that it br could treat cancer "more precisely"br without harmful drug side effects.