Progression-free survival (a) and overall survival (b) according to pre-maintenance PET/CT complete metabolic response and multiparameter flow cytometry negativity Abbreviations. ∧, and; CI, Confidence interval; HR, Hazard ratio; MFC, Multiparameter flow cytometry; MRD, Minimal residual disease; Neg, Negativity; P, P-value; PET/CT, Positron emission tomography/computed tomography; PFS, Progression-free survival; Pos, Positivity.