CD34, antigen; endogenous, compound; lenalidomide; plerixafor; adult; apheresis; cancer, center; cancer, patient; clinical, feature; clinical, practice; clinical, trial; cohort, analysis; conference, abstract; controlled, study; coronavirus, disease, 2019; drug, therapy; female; funding; human; human, cell; major, clinical, study; male; Maryland; medical, history; medical, record, review; multiple, myeloma; retrospective, study; statistical, significance; stem, cell, mobilization; surgery; transplantation