P1105: FINAL RESULTS OF THE PHASE I/II HOVON124/ECWM-R2 STUDY INCLUDING 2-YEAR RITUXIMAB MAINTENANCE AFTER INDUCTION WITH IXAZOMIB, RITUXIMAB AND DEXAMETHASONE IN RELAPSED WALDENSTRÖM'S MACROGLOBULINEMIA. (23rd June 2022) - Dimopoulos, M.-A.