We therefore initiated a phase II study to evaluate the safety and efficacy of venetoclax monotherapy in previously treated patients with WM (NCT02677324)....All patients carried the MYD88L265P mutation, and 16 (53%) also had a CXCR4 mutation….VGPR rates were lower in those with prior BTK-i exposure (7% vs. 27%; p=0.10), and CXCR4 mutations (6% vs. 29%; p=0.10).