P868: A CIRCULATING SERUM MIRNAS-BASED MODEL TO PREDICT EARLY MORTALITY IN MULTIPLE MYELOMA PATIENTS TREATED WITH BORTEZOMIB-BASED REGIMENS. (23rd June 2022) - Puła, A.; Robak, P.; Jarych, D.; Mikulski, D.; Dróżdż, I.; Szemraj, J.; Robak, T.