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Bortezomib/thalidomide/dexamethasone (VTD) induction therapy followed by autologous stem cell transplantation (ASCT) is one of the standard therapies for newly diagnosed multiple myeloma (NDMM). However, the appropriate depth of response to induction therapy and timing of upfront ASCT are still debated. We investigated if two additional cycles of VTD (VTD6) improved the responses and progression-free survival (PFS) compared with four cycles of VTD (VTD4). We retrospectively reviewed outcomes of 190 NDMM patients treated with at least four cycles of VTD followed by ASCT between September 2014 and August 2017 [VTD4,  n  = 129 (67.9%); VTD6,  n  = 61 (32.1%)]. The VTD6 group had a higher pre-ASCT complete response (CR) rate than the VTD4 group (31.1% versus 10.1%,  P  &lt; 0.001), but, the pre- and post-ASCT ≥ very good partial response (VGPR), and 2-year PFS were similar. Multivariate analysis revealed age, β 2 -microglobulin, and pre-ASCT CR as important factors for PFS. Two additional cycles of VTD prolonged PFS in patients with PR only after VTD4 [Hazard ratio (HR) = 0.29,  P  = 0.016] or those with Revised International Staging System stage I/II (HR = 0.36,  P  = 0.039). In conclusion, two additional VTD cycles may be helpful for patients with PR only after VTD4 but high risk MM needs the other treatment options.

bone marrow transplantation

Benefits of additional cycles of bortezomib/thalidomide/dexamethasone (VTD) induction therapy compared to four cycles of VTD for newly diagnosed multiple myeloma