[en] A 42 years old male with relapsed diffuse large B-cell lymphoma was given second-line chemotherapy followed by reduced intensity allogeneic stem cell transplantation from HLA matched brother. Twelve weeks post transplant, his disease relapsed evidenced by the appearance of lymphoma cells in the peripheral blood and declining donor chimerism. Donor lymphocyte infusion was given that induced complete lymphoma remission. The patient is well 3 years post transplant with his disease in complete remission. (author)