We describe a patient with CML in 1(st) chronic phase (CP) who experie
nced a graft failure 9 months after an HLA genotypically identical sib
ling BMT. Drug toxicity, viral infections, chronic graft-versus-host-d
isease (GVHD) or leukemic relapse were excluded. Chimerism study showe
d 85% of donor marrow cells. She underwent a second BMT, reengrafted b
ut died of grade IV acute GVHD.