National Center for Biotechnology Information. "Gene: PDCD1." NCBI, U.S. National Library of Medicine, 2023, www.ncbi.nlm.nih.gov/gene/5133
Okazaki T, Honjo T. PD-1 and PD-1 ligands: from discovery to clinical application. Int Immunol. 2007 Jul;19(7):813-24.
Sharpe AH, Pauken KE. The diverse functions of the PD1 inhibitory pathway. Nat Rev Immunol. 2018 Mar;18(3):153-167.
Kwok G, Yau TC, Chiu JW, Tse E, Kwong YL. Pembrolizumab (Keytruda). Hum Vaccin Immunother. 2016 Nov;12(11):2777-2789.