Jorge J. Castillo, Joshua N. Gustine, Kirsten Meid, Toni Dubeau, Patricia Severns, Steven P. Treon. Ibrutinib withdrawal symptoms in patients with Waldenström macroglobulinemia. Haematologica 2018;103(7):e307-e310; https://doi.org/10.3324/haematol.2017.186908.