Crohn's sufferers are genetically predisposed to the disease, which is first triggered in their body when they come into contact with a particular environmental stimulus. Once this happens, the immune system responds — leading to symptoms that blight the lives of sufferers.
Stem cells hold a potential solution to this problem. As the body's 'master' cells, which can be directed to form any type of tissue, they will be extracted from patients and then re-established in their bone marrow to 're-boot' the immune system, taking it back to a state before Crohn's symptoms were triggered.
There is also a brief mention of their other current investigation into the use of hookworms to control mild Crohn's disease, but unfortunately they don't say whether the trial is going well.