S174: HIGH LEVEL OF CIRCULATING TUMOUR DNA AT DIAGNOSIS CORRELATES WITH DISEASE SPREADING AND DEFINES MULTIPLE MYELOMA PATIENTS WITH POOR PROGNOSIS. (23rd June 2022) - Martello, M.; Poletti, A.; Bezzi, D.; Borsi, E.; Taurisano, B.; Solli, V.; Armuzzi, S.; Vigliotta, I.; Mazzocchetti, G.; Pistis, I.; Pantani, L.; Rocchi, S.; et al.