We performed an immunohistochemical analysis of tumor infiltrating lymphocytes (TIL) from Id1+/+/DPBS (pLKO-sc LLC), Id1+/+/anti-PD1 (pLKO-sc LLC), Id1-/-/DPBS (Id1sh LLC), and Id1-/-/anti-PD1 (Id1sh LLC) tumors (Table 2 and Figure 4). The gene discussed is ID1; the disease is neoplasm.