We report a case of haploidentical T-depleted BMT that engrafted durab
ly after a highly immunosuppressive conditioning regimen, DNA polymorp
hism analysis showed that granulocytes and monocytes were donor type b
ut T and B lymphocytes were host derived. Host tolerance to donor anti
gens was documented. The patient suffered from serious recurrent CMV i
nfections until split chimaerism shifted to full donor type 2 years po
st-BMT. Seven years after BMT the patient remains in complete remissio
n.