Frequent expression of C4d in hepatic graft-versus-host disease: Potential clue for diagnosis and distinguishing acute and chronic form

Background: Graft-versus-host disease (GVHD), a common complication of hematopoietic stem cell transplant, is generally regarded to develop through cell-mediated immune response following activation of helper T cells. Since production of antibodies is also mediated by helper T cells, the role of humoral immunity in GVHD is questioned and has not yet been explored in clinical practice. We conducted a pilot study to evaluate the role of antibody production in hepatic H-GVHD and whether it can distinguish acute and chronic forms. Results: C4d expression was increased in portal vessels and hepatic sinusoids of patients with histological proven evidence of GVHD 11/16 (P = 0.007). Patients classified as chronic GVHD were statistically more likely to have C4d expression in the portal vasculature and liver sinusoids (P = 0.011). Conclusion: Humoral activation seems to play a role in pathophysiology of hepatic, especially chronic GVHD. (C) 2010 Elsevier B.V. All rights reserved.