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autologous blood and marrow transplantation - Blog Science ...

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S<strong>and</strong>maier et al. 605<br />

synthesis pathway by binding to inosine 5-monophosphate dehydrogenase, <strong>and</strong> this<br />

block interferes with lymphocyte replication. Previous data had indicated that<br />

MMF/CSP was superior to MTX/CSP for GVHD prophylaxis. 24<br />

Consistent with<br />

those findings, only one of 11 MMF/CSP-treated dogs rejected its allograft at 12<br />

weeks while the remaining 10 dogs have stable mixed chimeras between 49 <strong>and</strong><br />

130 weeks after transplant without any evidence of GVHD (/*=0.06 compared with<br />

MTX/CSP <strong>and</strong> 0.01 compared with dogs given CSP alone). When the dose of TBI<br />

was lowered to 100 cGy, all six MMF/CSP-treated dogs rejected their <strong>marrow</strong><br />

grafts within 3-12 weeks of transplant.<br />

The role of peritransplant immunosuppression for induction of mixed<br />

chimerism has been demonstrated by studies using a mAb directed at the TCRaB<br />

complex (unpublished data). In this study, mAb 15.9D5, given daily for 9 days<br />

beginning on day -1, was able to control HVG reactions in a manner that was<br />

comparable to that seen with CSP given for 35 days after transplant. Addition of<br />

this antibody to the MMF/CSP regimen may make it possible to lower the TBI dose<br />

needed to establish mixed chimerism to

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