P1506: TECLISTAMAB REDUCES POLYCLONAL IMMUNOGLOBULIN LEVELS AND IMPAIRS VACCINATION RESPONSES IN HEAVILY PRETREATED MM PATIENTS oleh Kristine Frerichs, Christie Verkleij, Maria-Victoria Mateos, Sonja Zweegman, Kaz Groen, Ilse Kuipers, Tom Martin, Cesar Rodriguez, Ajay Nooka, Sandy Kruijswijk, Sheri Skerget, Margaret Doyle, Arnob Banerjee, Katherine Chastain, Alfredo Perales-Puchalt, Tara Stephenson, Clarissa Uhlar, Rachel Kobos, Raluca Verona, Niels W.C.J. van de Donk