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Antiprogrammed cell death protein 1 (anti-PD-1) therapy promotes an antibody-mediated immune response. (A) Quantification of serum IgM levels from healthy mice (n=3), and anti-PD-1-treated (n=14) and isotype-treated (n=13) tumor-bearing mice. (B) Flow cytometry staining of B16 (red) and KLN205 (blue) tumor cells with IgG from serum derived from healthy and tumor-bearing mice. Percentages of positive B16 and KLN205 cells are indicated. *P<0.05; **p<0.01.
