Beyond its immune regulatory roles, B7-H3 can promote tumor growth, invasion, migration, angiogenesis, and metastasis.
To investigate B7-H3 function in vitro and evaluate in vivo efficacy of B7-H3 antibodies, Biocytogen generated a humanized B-hB7-H3 mouse model, and a human B7-H3-expressing MC38 cell line (hB7-H3-MC38).
Anti-human B7-H3 antibodies showed robust anti-tumor efficacy in hB7-H3 MC38 and hB7-H3 EL4/B-hB7-H3 mice.
Combined anti-human B7-H3 and anti-mouse PD-1 blockade further improved tumor inhibition compared to monotherapies.
Humanized B-hB7-H3 mice are a powerful preclinical model for in vivo efficacy evaluation of human B7-H3 antibodies and combination therapies.
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