P850: THE HUMORAL AND CELLULAR RESPONSE TO SARS-COV-2 MRNA VACCINATION IN PATIENTS WITH MULTIPLE MYELOMA AND PRE-MALIGNANT MONOCLONAL GAMMOPATHIES: IMPACT OF OMICRON VARIANT. (23rd June 2022) - Storti, P.; Marchica, V.; Vescovini, R.; Franceschi, V.; Russo, L.; Raimondi, V.; Toscani, D.; Burroughs Garcia, J.; Iannozzi, N. T.; Dalla Palma, B.; Giaimo, M. T.; Notarfranchi, L.; et al.