Relapse is one of the main problems which can occur following allogeneic transplantation for haematological malignancies. In this situation the enhancement of the graft-versus-leukaemia effect by transfusion of donor buffy coats with or without cytokines may lead to complete remission especially in myeloid leukaemias. FISH (fluorescence in situ hybridization) is a sensitive method to monitor chimaerism in gender-different transplantation.
We report a case of successful buffy coat transfer therapy > 9 years after bone marrow transplantation.This is the longest interval reported, to our knowledge, between transplantation to relapse, which was treated by adoptive immunotherapy. Complete donor chimaerism was confirmed by FISH.