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Detection of renal impairment as one specific comorbidity factor in multiple myeloma: multicenter study in 198 consecutive patients

Objectives:  Comorbidity factors have been reported in cancer patients to predict progression free survival (PFS) and overall survival (OS). Renal impairment (RI) is postulated as one negative prognostic factor in multiple myeloma (MM). The study aim was to detect the best way to define RI and the impact of different RI stages on MM outcome.