Clinical significance of anti-endothelial cell antibody in allogeneic hematopoietic stem cell transplantation recipients with graft-versus-host disease.

Anti-endothelial cell antibody (AECA) is well known to reflect endothelial injury. Graft-versus-host disease (GVHD), a major complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT), is also closely associated with endothelial injury. We hypothesized that AECA may be associated with GVHD. To investigate the clinical significance of AECA in allo-HSCT recipients with GVHD, we detected AECA by cyto-enzyme-linked immunosorbent assay (cyto-ELISA) in allo-HSCT recipients with acute and/or chronic GVHD (aGVHD and cGVHD). Incidences of anti-HMEC-1 AECA (anti-HMEC) and anti-EA.hy926 AECA (anti-EAHY) were significantly higher in patients with grade II-IV than grade 0-I aGVHD (P = 0.049, P = 0.011, respectively). There was no difference in the incidence of AECA between patients with and without cGVHD. Patients with anti-EAHY positive in the early stage post-transplant demonstrated a higher incidence of cGVHD (P = 0.044). In patients with grade 0-I aGVHD, AECA-positive patients had higher overall survival and disease-free survival (P < 0.05), and tended to have lower incidences of relapse and transplant-related mortality. Our data suggest that AECA plays an important role in the pathogenesis of GVHD.