Abstract 4973: The immunosuppressive tumor microenvironment of metastatic osteosarcoma inhibits the cytotoxic effect of tumor-infiltrating lymphocytes von Ligon, John A., Oke, Teniola F., Choi, Woonyoung, Fong, Megan H., Levin, Adam, Rhee, Daniel S., Morris, Carol D., Siegel, Nicholas, Hsieu, Emily H., Meyer, Christian F., McConkey, David J., Anders, Robert A., Pardoll, Drew M., Llosa, Nicolas J.

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