Inflammatory Bowel Disease Center, Cedars-Sinai Medical Center, 110 George Burns Road, Davis Building, Room 4005, Los Angeles, CA 90048, USA. Maria.Abreu@cshs.org
Crohn's disease and ulcerative colitis (UC) are heterogeneous disorders, and as such, the response to therapy is likewise heterogeneous. Therefore, stratification of patients into distinct phenotypes and potentially genotypes will lead to more definitive answers with respect to evaluation of novel and established therapies.