P817: VALIDATION OF THE SECOND REVISED INTERNATIONAL STAGING SYSTEM (R2-ISS) IN A LARGE POPULATION-BASED, NATIONWIDE COHORT OF PATIENTS WITH NEWLY DIAGNOSED MULTIPLE MYELOMA

oleh: Christian Brieghel, Morten Nørgaard Andersen, Nicolai Grønne Jørgensen, Trine Silkjær, Thomas Lund, Maja Hinge, Henrik Gregersen, Robert Schou Pedersen, Agoston Szabo, Carsten Niemann