In transplant-eligible, fit patients with multiple myeloma who have an inadequate response to front-line therapy, what regimen would you choose for second-line?

for transplant eligible patients who you want to get to transplant but have not achieved an adequate response for stem cell collection, there are 3 senarios:

1: if no response at all to front line therapy (VRd) say <PR: would do VDPACE x 2-3 cycles, using the last cycle as chemo mobilization with co...