Western blot analysis of tumor lysates showed that anti-mPD-1 treatment led to a reduction in F4/80, PD‐L1, Ki‐67, and PCNA levels, suggestive of reduced macrophage infiltration and tumor cell proliferation, although only the decrease in PCNA reached statistical significance (Fig. 2E and Supplementary Fig. 1B). The gene discussed is PCNA; the disease is neoplasm.