P868: A CIRCULATING SERUM MIRNAS-BASED MODEL TO PREDICT EARLY MORTALITY IN MULTIPLE MYELOMA PATIENTS TREATED WITH BORTEZOMIB-BASED REGIMENS. - A. Puła; P. Robak; D. Jarych; D. Mikulski; I. Dróżdż; J. Szemraj; T. Robak (HemaSphere, 2022)