Similarly, PD-L1 is expressed by immune cells (including T cells, B cells, macrophages, dendritic cells (DCs), and mast cells) as well as various cancer cells, including those of the breast, cervix, colorectum, stomach, glioblastoma, melanoma, non-small-cell lung, ovary, PDA, and urinary bladder [96,97]. The gene discussed is CD274; the disease is Patent ductus arteriosus.