PB2100: REAL-WORLD TREATMENT PATTERNS OF TRIPLE-CLASS REFRACTORY (TCR) MULTIPLE MYELOMA (MM) ACROSS THE UNITED STATES (US), CANADA, AND WESTERN EUROPE: A RETROSPECTIVE CHART STUDY - Xavier Guillaume; Dahbia Horchi; Jorge Gomez; Patrick Hlavacek; Jinma Ren; Alex Schepart; Didem Aydin; Marco Dibonaventura (HemaSphere, 2023)