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Kaplan-Meier survival curves of the patients with MM in the validation cohort, categorized by different staging systems. (a) International Staging System (ISS); (b) Revised International Staging System (R-ISS); (c) Durie-Salmon (D-S); (d) Mayo Stratification of Myeloma and Risk-Adapted Therapy (mSMART); (e) International Myeloma Working Group (IMWG).
