Transmission of leukemic donor cells by allogeneic stem cell transplantation in a context of familial CLL: should we screen donors for MBL?

To the editor: A family history of chronic lymphocytic leukemia (CLL) is one of the best characterized risk factors for the development of CLL. First-degree relatives of individuals with CLL have a 3- to 8-fold increased risk for CLL.[1][1],[2][2] CLL often has an indolent behavior, but some