Bacteria Molecule Blocks Breast Cancer Breakthrough could lead to powerful new anti-cancer drugs By Mark Russell, Newser Staff Posted Aug 22, 2011 2:20 AM CDT 5 comments Comments A new molecule discovered in bacteria could hold the key to fighting breast cancer. (Shutterstock) (Newser) – Scientists have discovered a natural bacteria molecule that could hold the key to fighting breast cancer, reports the Independent. Thiostrepton clamps onto the cancer-causing FOXM1 protein, blocking it and stopping it from spreading at an early stage. "It's fascinating to discover how a simple bacteria could hold the key to powerful new approaches to treat breast cancer," said a researcher. The goal of scientists now is to create a drug that mimics the blocking ability of thiostrepton, but even more effectively.