Tumor antigen-specific CD8 T cells infiltrating the tumor express high levels of PD-1 and are functionally impaired.
Blood. 2009 Aug 20;114(8):1537-44. doi: 10.1182/blood-2008-12-195792. Epub 2009 May 7.
Blood. 2009.
PMID: 19423728
Free PMC article.