P1253: MAVORIXAFOR DISRUPTS THE CROSS TALK BETWEEN WALDENSTRÖM’S MACROGLOBULINEMIA CELLS AND THE BONE MARROW MICROENVIRONMENT RESULTING IN ENHANCED SENSITIVITY TO B-CELL TARGETED THERAPIES - H. Monticelli; T. Kruitwagen; M. Tardelli; T. Rebelo; B. Maierhofer; S. Maier-Munsa; K. Zmajkovicova; A. G. Taveras; C. Nguyen (HemaSphere, 2022)