The role of oral vancomycin in inducing remission for biologic-experienced ulcerative colitis with concomitant primary sclerosing cholangitis and liver transplantation.

While a minority of patients with ulcerative colitis has primary sclerosing cholangitis (PSC), a significant proportion of patients with PSC have ulcerative colitis. The activity of PSC is usually not commensurate with the degree of concomitant colonic inflammation. Moreover, up to one-third of patients with a history of ulcerative colitis may paradoxically experience worsening of their colonic inflammation despite receiving immunosuppression after liver transplantation for PSC. There is a dearth of data pertaining to the management of ulcerative colitis in this post-transplantation patient population. We hereby delineate the case of a patient with severe refractory ulcerative colitis in the aftermath of liver transplantation due to PSC who eventually responded to oral vancomycin after failure of biologic therapy. Since current data implicate that patients with ulcerative colitis and PSC often present with distinct alterations of their colonic microbiome, oral vancomycin may be conjectured to demonstrate a therapeutic role. In this article, the review of literature suggests that oral vancomycin might indeed be an effective substitute in patients in whom the uptake of biologic agents may be challenging owing to their already immunosuppressed status.