LYMPHOCYTOTOXIC ANTIBODIES AND BONE MARROW GRAFTS FROM HLA-IDENTICAL SIBLINGS I. HLA ANTIBODIES

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Abstract

SUMMARY

In a series of 30 bone marrow grafts (in 29 recipients) from HLA-identical siblings for aplastic anemia, no correlation was demonstrated between rejection and pregraft HLA antibodies (P> 0.50). However, after grafting, HLA antibodies persisted in nine cases and graft rejection occurred, whereas in all but one of the remaining eight cases the HLA antibodies disappeared and a permanent engraftment was observed (P = 0.0008). These results suggest a relationship between engraftment and persistence or disappearance of HLA antibodies as an indication of the level of immunosuppression obtained with the conditioning regimen.

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