Journal
CURRENT OPINION IN IMMUNOLOGY
Volume 21, Issue 5, Pages 531-537Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.coi.2009.08.004
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Numerous retrospective studies have been reported analysing the role of HLA mismatches that confer donor NK alloreactivity towards the recipient on the outcome of haematopoietic stem cell transplantation. A bewildering variety of findings have been observed with different studies showing either beneficial or deleterious effects on outcome. This review organises the reports into those that use similar definitions of NK alloreactivity, suggests possible reasons for such disparate results and assesses whether any recommendations can be made in relation to donor selection. There is growing evidence that the effect of human NK alloreactivity on outcome is transplant protocol dependent. Protocol variables most likely to affect outcome are those that influence donor T cell numbers. At this time, it is not possible to predict how the outcome of unrelated donor transplantation will be affected by HLA mismatches conferring potential donor NK alloreactivity.
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