<qa>  What is the main reason for the hypothesis that Elotuzumab and PBMCThis study is based on the hypothesis that the addition of Elotuzumab and autologous PBMC reconstitution to standard-of-care auto-SCT and lenalidomide maintenance will be safe and feasible. Furthermore, we hypothesize that Elotuzumab and PBMC reconstitution will target residual myeloma cells, enhance NK cell activation and ADCC, and promote tumor-specific humoral and cellular immune responses against myeloma cells, resulting in long-term maintenance of the minimal residual disease state. 