P860: THE DE NOVO DNA METHYLTRANSFERASE DNMT3B PLAYS AN IMPORTANT ROLE IN MM CELL GROWTH, CLONOGENICITY AND DRUG RESPONSE - C. Muylaert; L. Van Hemelrijck; P. Vlummens; A. Maes; K. De Veirman; E. Menu; K. Vanderkerken; E. De Bruyne (HemaSphere, 2022)