NFKB1 and neoplasm: To determine whether PD‐1 inhibition cooperates with the absence of myeloid NF‐κB p50 to slow Nb tumor growth, p50(f/f);Lys‐Cre mice were inoculated with 9464D cells and then received four injections of anti‐PD‐1 antibody between days 32 and 43.