I was waiting to see what RG members answered; there seem to have been positive and negative findings to this, but I haven't really analysed the arguement. The first is negative:
Hawkey, C. J., Allez, M., Clark, M. M., Labopin, M., Lindsay, J. O., Ricart, E., ... & Russell, N. (2015). Autologous Hematopoetic Stem Cell Transplantation for Refractory Crohn Disease: A Randomized Clinical Trial. JAMA, 314(23), 2524-2534.
Jauregui-Amezaga, A., Rovira, M., López, A., Marín, P., Rodriguez, S., Rimola, J., ... & Ricart, E. (2016). Long-lasting Remission Induced by Syngeneic Haematopoietic Stem Cell Transplantation in a Patient with Refractory Crohn’s Disease. Journal of Crohn's and Colitis, jjw062.
Oyama, Y., Craig, R. M., Traynor, A. E., Quigley, K., Statkute, L., Halverson, A., ... & Kletzel, M. (2005). Autologous hematopoietic stem cell transplantation in patients with refractory Crohn’s disease. Gastroenterology, 128(3), 552-563.
I have the full text if you are unable to access it.
http://www.ncbi.nlm.nih.gov/pubmed/15765390
Very best wishes,
Mary
Article Long-lasting Remission Induced by Syngeneic Haematopoietic S...
Overall, mixed results have been reported regarding the efficacy of haematopoyetic and mesenchymal stem cells in refractory luminal Crohn's disease in phase I/II trials.
Concerning perianal fistulae secondary to Crohn's disease, results have been in general optimistics and several reports suggest an improved healing in patients subject to stem cell therapy (Dis Colon Rectum 2009, 52:79; J Colorectal Dis 2013, 28:313; Int J Colorectal Dis. 2013;28:313; Gastroenterology. 2015;149:918)