IBTK and B-cell chronic lymphocytic leukemia: The phosphatidylinositol 3-kinase (PI3Kδ)-inhibitor, idelalisib, can be active also in BTKi-refractory and BCL2i-refractory CLL [1, 5, 7], and thus might be an option for bridging into allogeneic hematopietic cell transplantation (alloHCT).