As expected, the anti-PD-L1 antibody could effectively bind to PD-L1 on tumor cell membrane, and then competitively block the interaction between PD-L1 and PD-1 (Figure 6B), thus facilitating the sufficient tumor infiltration of activated CTLs that owned the ability to eliminate tumors (Figure 6C). The gene discussed is PDCD1; the disease is neoplasm.