P834: MULTIPARAMETRIC FLOW CYTOMETRY FOR THE DETECTION OF CIRCULATING TUMOR CELLS IN PATIENTS WITH IGM MONOCLONAL GAMMOPATHIES - Ioannis Kostopoulos; Stamatia Skourti; Nefeli Mavrianou Koutsoukou; Christine Liacos; Alexandra Papadimou; Kostantina Taouxi; Foteini Theodorakakou; Despina Fotiou; Evangelos Terpos; Ourania Tsitsiloni; Meletios A. Dimopoulos; Efstathios Kastritis; et al. (HemaSphere, 2023)