Figure 1 shows representative images for (a) negative (0) PD1 staining on lymphocytes, and (b) 2+ and (c) 3+ positive PD1 staining on lymphocytes as well as (d) negative (0) PD1 staining on tumor cells and (e), 2+ and (f) 4 + positive PD1 staining on tumor cells. The gene discussed is PDCD1; the disease is neoplasm.