PD‐L1, also known as B7‐H1 or CD274, is a cell surface glycoprotein, which leads to T‐cell inactivity or apoptosis by binding PD‐1, a receptor expressed by the T lymphocytes.19 The interaction between PD‐1/PD‐L1 leads to immune system impairment through a range of mechanisms, which often differs between tumour types. The gene discussed is PDCD1; the disease is neoplasm.