Histological correlation between different centers using the skin explant model to predict graft-versus-host disease following bone marrow transplantation

Acute graft-versus-host disease (GVHD) remains the major complication of al logeneic stem cell transplantation (SCT) with an incidence of 40-60% and a mortality of up to 5076. Several assays have been developed to try tu predi ct the development of GVHD including the mixed lymphocyte culture reaction, cytotoxic and helper T lymphocyte precursor frequency assays. In the North ern region of England we have used an in vitro skin explant model for predi cting GVHD in MHC compatible bone marrow transplant recipients since 1988. The aims of the present study was to test the reproducibility of the model in two other bone marrow transplant centers in Europe. The assay consists o f incubating patient skin explants with effector cells from mixed donor ver sus recipient lymphocyte cultures and the subsequent detection of graft-ver sus-host reactions by histopathological grading (0-IV) of the skin explants . 503 slides from 134 patients were evaluated. All were graded for negative GVHR grade 0-I or positive grade II-IV. Results from control and test slid es significantly correlated between centers to the p value of 0.0001 by Fis her's exact probability test. These results show that the skin explant assa y is reproducible between centers and supports the continued use of the ass ay to predict GVHD in allogeneic stem cell transplant recipients. (C) Ameri can Society for Histocompatibility and Immunogenetics, 2001. Published by E lsevier Science Inc.