Graft-versus-myeloma effect in two cases.

Allogeneic bone-marrow transplantation (BMT) is associated with the graft-versus-leukaemia effect because of the antileukaemic action of donor lymphocytes. We describe a graft-versus-myeloma effect after BMT in multiple myeloma. Two patients with recurrent multiple myeloma after allogeneic BMT (T cells partly depleted, 10(5) T cells infused per kg) received leucocyte infusions obtained by leukapheresis from their original marrow donors. The patients were a 48-year-old woman and a 49-year-old man. Both patients developed graft-versus-host disease and achieved complete remission of myeloma. Chimerism was complete in both patients in that all peripheral blood cells were of donor origin. We see our results as evidence for a graft-versus-myeloma effect. Using this form of adoptive immunotherapy, we could administer 1000-3000 times more T cells than with the earlier BMT.