P916: COEXISTENCE OF ≥2 HIGH-RISK MOLECULAR ABNORMALITIES SUPERVENES THE PROGNOSTIC VALUE OF THE REVISED INTERNATIONAL STAGING SYSTEM FOR MYELOMA: REAL-WORLD DATA ANALYSIS FROM THE... oleh E. Katodritou, D. Dalampira, T. Triantafyllou, M. Gavriatopoulou, S. Delimpasi, A. Pouli, T. Papadopoulou, E. Verrou, A. Sevastoudi, K. Tsirou, L. Katsika, G. Douganiotis, N. Karampatzakis, T.-E. Metallinou, V. Palaska, M. Kotsopoulou, C. Lalayianni, M.-C. Kyrtsonis, E. Spanoudakis, D. Maltezas, A. Chatzivasili, M.-A. Dimopoulos, E. Terpos, E. Kastritis