Indications for switching therapy
• <Heme-PR after 1 month
• <Heme-VGPR after 3 months (or plateau in FLCs before 3 months)
• <Heme-CR after 6 months in the setting of organ non-response/progression and residual clonal plasma cells in bone marrow
• Hematologic relapse/pre/progression with dFLC>2 mg/dL as trigger for initiation of new clone-directed Rx