Nonmyeloablative allogeneic stem cell transplantation in relapsed/refractory chronic lymphocytic leukemia: long-term follow-up, prognostic factors, and effect of human leukocyte histocompatibility antigen subtype on outcome. - Khouri, Issa F; Bassett, Roland; Poindexter, Nancy; O'Brien, Susan; Bueso-Ramos, Carlos E; Hsu, Yvonne; Ferrajoli, Alessandra; Keating, Michael J; Champlin, Richard; Fernandez-Vina, Marcelo (Cancer (0008543X), 2011)