CD274 and non-small cell lung carcinoma: In the context of the development of the proliferative process, cells of some tumors are characterized by high PD-L1 expression (these include melanoma, non-small cell lung cancer, some lymphomas and breast, ovarian, bladder and kidney cancer) [6], which results in the inhibition of lymphocytes infiltrating cancerous tissue, impacting the body’s natural defense mechanism [1].