Ab	Antibody
ADCC	Antibody-dependent cellular cytotoxicity
ADCP	Antibody-dependent cellular phagocytosis
ADCs	Antibody–drug conjugates
Ag	Antigen
APCs	Antigen-presenting cells
APRIL	A proliferation-inducing ligand
B7-H1	B7-homologue 1
BCL-2	B-cell lymphoma-2
BCMA	B-cell maturation antigen
BiTEs	Bispecific T cell engager mAbs
BM	Bone marrow
BMME	Bone marrow microenvironment
BMSCs	Bone marrow stromal cells
BMT	Bone marrow transplantation
Bregs	Regulatory B cells
CAR-T	Chimeric antigen receptor–T cell therapy
cDCs	Conventional dendritic cells
CCL	C-C motif ligand
CSF-1	Colony-stimulating factor 1
CTLA-4	Cytotoxic T-lymphocyte antigen 4
CTLs	Cytotoxic T lymphocytes
CXCL	C-X-C motif Chemokine ligand
CXCR	C-X-C motif Chemokine receptor
DAMPs	Damage-associated molecular patterns
Dara-VTD	Daratumumab plus bortezomib, thalidomide, and dexamethasone
DCs	Dendritic cells
ECM	Extracellular matrix
ECs	Endothelial cells
EMA	European Medicines Agency
EPCs	Endothelial progenitor cells
ERK	Extracellular signal-regulated kinase
FDA	Food and Drug Administration
FBs	Fibroblasts
Foxp3	Forkhead box P3
HLA	Human leukocyte antigen
IL	Interleukin
imDCs	Immature DCs
ImiDs	Immunomodulatory drugs
INF-γ	Interferon-γ
JAM-A	Junctional adhesion molecule A
mAb	Monoclonal antibodies
mDCs	Mature DCs
MDSCs	Myeloid-derived suppressor cells
MGUS	Monoclonal gammopathy of undetermined significance
MHC	Major histocompatibility complex
MM	Multiple myeloma
MSCs	Mesenchymal stromal cells
NK	Natural killer
OS	Overall survival
PCs	Plasma cells
PD-1	Programmed death-1
pDCs	Plasmacytoid dendritic cells
PD-L1	PD ligand 1
PFS	Progression-free survival
PGE2	Prostaglandin E2
PRRs	Pattern recognition receptors
RANKL	Receptor activator of nuclear factor kappa-B ligand
RR	Response rate
SMM	Smoldering multiple myeloma
TACI	Transmembrane activator CAML interactor
TAMs	Tumor-associated macrophages
TFH	T follicular helper
TGF-β	Transforming growth factor-β
Th	T helper
TIGIT	T cell immunoreceptor with immunoglobulin and ITIM domains
TLR	Toll-like receptor
TNF	Tumor necrosis factor
Tregs	Regulatory T cells
TTEs	Terminal effector CD8+ T cells
ULBPs	UL-binding proteins
VEGF	Vascular endothelial growth factor