Bruton’s tyrosine kinase (BTK) is a crucial component of the B-cell receptor-signaling pathway that has been associated with the pathogenesis of B-cell malignancies. Ibrutinib is an oral BTK inhibitor that showed promising antitumor activity in preclinical lymphoma models. Subsequently, ibrutinib was tested in prospective clinical studies and was found to be active in various B-cell malignancies, including chronic lymphocytic leukemia (CLL), mantle cell lymphoma (MCL), and Waldenström’s macroglobulinemia (WM).
