
Keywords: HLA-G; human leukocyte antigen G; HLA-E; human leukocyte antigen E; PD-L1; programmed cell death 1 ligand 1; IL-10; interleukin-10; TGF-β; transforming growth factor beta; sHLA-G; soluble HLA-G; OL; oral leukoplakia; GB; granzyme B; OPL; oral precancerou