Mixed chimera converted into full donor chimera with powerful graft-versus-leukemia effects but no graft-versus-host disease after non T cell-depleted HLA-mismatched peripheral blood stem cell transplantation
By. Wu et al., Mixed chimera converted into full donor chimera with powerful graft-versus-leukemia effects but no graft-versus-host disease after non T cell-depleted HLA-mismatched peripheral blood stem cell transplantation, BONE MAR TR, 26(6), 2000, pp. 691-693
Citations number
4
Categorie Soggetti
Hematology,"Medical Research Diagnosis & Treatment
Instead of donor T cell depletion, we used CTLA4 and TJU103 (a small organi
c compound believed to block CD4 binding to MHC II molecule of APC) to bloc
k donor T lymphocyte activation in vitro before infusion, and mycophenolate
mofetil to control the activity of lymphocytes of the recipient. We succes
sfully treated a patient with an HLA-mismatched graft without donor T cell
depletion. Mixed chimerism was observed 30 days and 60 days after transplan
tation. STR-PCR showed that 28% and 62% of blood mononuclear cells (MNC) we
re donor derived at day +30 and day +60, respectively, Mixed chimerism conv
erted into full donor chimerism, when 99.7% of the MNC in the recipient wer
e donor derived after three courses of DLI, A powerful GVL effect related t
o mixed chimerism was observed. No acute GVHD occurred, only grade II chron
ic GVHD occurred 6 months after transplant. Based on this case, we suggest
that: (1) stable mixed chimerism can be intentionally established across HL
A barriers without donor T cell depletion; (2) mixed chimerism can be conve
rted into full donor chimerism by DLI; (3) mixed chimerism induced with thi
s approach can be associated with a very powerful GVL effect, and these may
be enhanced by DLI, without severe GVHD.