This site provides information about a clinical study for treatment of patients with severe Crohn's Disease, using bone marrow transplantation. This study is being conducted by Dr. George McDonald and teams of doctors and nurses at the University of Washington Medical Center, Seattle Children's Hospital and the Fred Hutchinson Cancer Research Center in Seattle.

At this time, the study is closed to enrollment while we analyze data from patients who received bone marrow transplants in the last two years. We will be unable to answer inquiries about the study until we re-open the protocol. Please re-check this website at intervals for updates.

Allogeneic hematopoietic cell transplantation for patients with treatment-refractory Crohn's Disease

A phase 2 study supported in part by an Inflammatory Bowel Disease Grant from the Broad Medical Research Program at the Crohn's and Colitis Foundation of America

Patient Information »
An introduction to the Crohn's Allogeneic Transplant Study (abbreviated CATS).
Are you Eligible? »
This section contained a questionnaire that we used to determine eligibility for the CATS protocol, but because we are not accepting inquiries at this time, we have temporarily removed the questionnaire.
Physician Information »
A detailed summary for doctors, including links to the website and medical literature.
Contact Us »
At this time, we are not accepting inquiries about the CATS protocol.
Updates »
The latest information about the Crohn’s Allogeneic Transplant Study.