The video discusses the role of the immune system in fighting cancer and the use of immunotherapy as a treatment. It explains how T-cells recognize and attack tumor cells. It also introduces PD-L1 inhibitors, a class of drugs that block the interaction between PD-L1 and PD-1, helping the immune system identify and fight tumor cells. Unlike chemotherapy, which directly kills cancer cells, immunotherapy activates the immune system to induce programmed cell death in tumors. This makes PD-L1 inhibitors seen as a promising branch of cancer therapy.
