CD274 and mature T-cell and NK-cell non-Hodgkin lymphoma: In T-cell lymphomas, PDL1 expression is observable in peripheral T-cell lymphoma (PTCL), anaplastic large-cell lymphoma (ALCL), angioimmunoblastic T-cell lymphoma (AITL), extranodal NK/T-cell lymphoma of the nasal type, cutaneous T-cell lymphoma, and adult T-cell leukemia/lymphoma [27].