Biagi E, Yvon E, Dotti G, Amrolia PJ, Takahashi S, Popat U, Marini F, Andreeff M, Brenner MK, Rousseau RF. Bystander transfer of functional human CD40 ligand from gene-modified fibroblasts to B-chronic lymphocytic leukemia cells. Hum Gene Ther. 2003 Apr 10; 14(6):545-59.