P894: A PHASE II TRIAL TO EVALUATE THE EFFICACY OF DARATUMUMAB WITH DCEP IN RELAPSED/REFRACTORY MULTIPLE MYELOMA PATIENTS WITH EXTRAMEDULLARY DISEASE AFTER BORTEZOMIB BASED TREATMENT. (23rd June 2022) - Byun, J. M.; Min, C.-K.; Kim, K.; Bang, S.-M.; Lee, J.-J.; Kim, J. S.; Yoon, S.-S.; Koh, Y.