Host-specific interleukin-2-secreting donor T-cell precursors as predictors of acute graft-versus-host disease in bone marrow transplantation between HLA-identical siblings
M Theobald, T Nierle, D Bunjes, R Arnold, and H Heimpel
BACKGROUND. Acute graft-versus-host disease (GVHD) is a serious complication of allogeneic bone marrow transplantation from an HLA-identical sibling. There is no practical test before transplantation that gives sufficient information to predict the degree of allogeneic reactivity between HLA-identical siblings. METHODS. We determined the frequency with which host-specific interleukin-2-secreting donor T-cell precursors occurred in 16 consecutive pairs of HLA-identical siblings before they underwent marrow grafting. The results were correlated with the development of acute GVHD after transplantation. RESULTS. High frequencies of host-specific T-cell precursors (> or = 1 per 100,000) were detectable before transplantation in eight donors whose siblings later had severe (grade II or III) acute GVHD. Among the donors to eight patients with mild (grade 0 or 1) acute GVHD, low frequencies (< 1 per 100,000) were found. CONCLUSIONS. Analysis of the frequency of such cells before transplantation may be a useful predictor of severe acute GVHD in allogeneic bone marrow transplantation between HLA-identical siblings. It is possible that the patients at risk for serious acute GVHD after marrow grafting may benefit from some alternative form of immunosuppressive therapy.
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Department of Internal Medicine III, University Hospital, Ulm, Germany.
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