Cana Tal Danino, a synthetic biologist explains how can a programmed bacteria able to find liver tumors and later be a success on cancer treatment.

"One of the surprising facts about bacteria is that they can naturally grow inside of tumors. This happens because typically tumors are areas where the immune system has no access, and so bacteria find these tumors and use them as a safe haven to grow and thrive. We started using probiotic bacteria which are safe bacteria that have a health benefit, and found that when orally delivered to mice, these probiotics would selectively grow inside of liver tumors."

Watch his interesting talk in Ted's website.