Correction of Duncan's syndrome by allogeneic bone marrow transplantation.

Duncan's syndrome (X-linked lymphoproliferative disorder) is a fatal immunodeficiency syndrome of unknown aetiology and without cure. We show that allogeneic bone marrow transplantation can correct the lethal immune deficits in a patient with this syndrome. We suggest that the primary abnormality in Duncan's syndrome is in bone-marrow derived cells.