Expression levels can be assessed either as tumor proportion score (TPS), looking at PD‐L1 membrane expression on tumor cells only, or the combined positive score (CPS), which takes into account partial or complete membrane PD‐L1 expression on the tumor cells as well as PD‐L1 expression (membranous and cytoplasmic) on infiltrating lymphoid and myeloid cells. The gene discussed is CD274; the disease is neoplasm.