OS	Osteosarcoma
TME	Tumor Microenvironment
M2	M2 Macrophage
MDSC	Myeloid-Derived Suppressor Cell
Treg	Regulatory T Cell
IMSC	Immunosuppressive Cell
MIP-1α/CCL3	Macrophage Inflammatory Protein-1α
R/M	Relapsed or Metastatic
IMC	Imaging Mass Cytometry
TOF	Time-of-Flight
CM	Conditioned Media
MFI	Median Fluorescence Intensities
RFS	Recurrence-Free Survival
MFS	Metastasis-Free Survival
HR	Hazard Ratio
cCOL1	Collagen Type 1 (Cellular)
eCOL1	Collagen Type 1 (Non-cellular)
cNK	Classical NK Cell
aNK	Activated NK Cell
tNK	T-like NK Cell
Mono	Monocyte
DC	Dendritic Cell
hT	Helper T Cell
cT	Cytotoxic T Cell
mhT	Memory T Helper Cell
mcT	Memory Cytotoxic T Cell
tfhT	T Follicular Helper T Cell
ahT	Activated Helper T Cell
ecT	Effector Cytotoxic T Cell
acT	Activated Cytotoxic T Cell
nhT	Naïve Helper T Cell
ncT	Naïve Cytotoxic T Cell
Endo	Endothelial Cell
Epi-like	Epithelial-like Cell
Fib	Fibroblast
StemC	Stem Cell
TAM	Tumor-Associated Macrophage