P27: HUMORAL RESPONSE RATE POST MRNA COVID19 VACCINATION (BNT162B2) IS HIGLY DEPENDENT TO BONE MARROW PLASMACYTOSIS: LONG FOLLOW-UP OF SYMPTOMATIC MULTIPLE MYELOMA PATIENTS. (5th April 2022) - Mele, G; Romano, C; Spina, A; Merchionne, F; Quintana, G; Urbano, M; Pasanisi, AM; Rinaldi, E; Solfrizzi, MP; Romano, A; Guaragna, G; DiNoi, ML; et al.