B7 homolog 3 (B7-H3) is a member of the B7 ligand family. It is highly expressed in various human cancers, especially mesenchymal malignancies. B7-H3 regulates cancer progression through multiple signaling pathways such as JAK2/STAT3, NF-κB, PI3K/AKT, and ERK. It also has the ability to downregulate CD8