2009
DOI: 10.1182/blood-2008-12-195792
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Tumor antigen–specific CD8 T cells infiltrating the tumor express high levels of PD-1 and are functionally impaired

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Cited by 1,525 publications
(1,228 citation statements)
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“…This suggestion may account for the clinical implication that a high PD-1 + /CD8 + tumorinfiltrating lymphocyte ratio is a poor prognostic factor for pulmonary adenocarcinomas in this study. Moreover, it has been demonstrated that the main subset of tumor-infiltrating immune cells expressing PD-1 were CD8 + rather than CD4 + T cells, [14][15][16]49 supporting that PD-1 + cells in pulmonary adenocarcinomas are primarily CD8 + T cells. Thus, it is reasonable that high PD-1 + /CD8 + tumor-infiltrating lymphocyte ratios and PD-L1 expression in tumors might inhibit specific immune responses against tumor cells that may be a useful parameter for unfavorable prognosis of patients with pulmonary adenocarcinoma.…”
Section: Discussionmentioning
confidence: 92%
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“…This suggestion may account for the clinical implication that a high PD-1 + /CD8 + tumorinfiltrating lymphocyte ratio is a poor prognostic factor for pulmonary adenocarcinomas in this study. Moreover, it has been demonstrated that the main subset of tumor-infiltrating immune cells expressing PD-1 were CD8 + rather than CD4 + T cells, [14][15][16]49 supporting that PD-1 + cells in pulmonary adenocarcinomas are primarily CD8 + T cells. Thus, it is reasonable that high PD-1 + /CD8 + tumor-infiltrating lymphocyte ratios and PD-L1 expression in tumors might inhibit specific immune responses against tumor cells that may be a useful parameter for unfavorable prognosis of patients with pulmonary adenocarcinoma.…”
Section: Discussionmentioning
confidence: 92%
“…6,8,13 Furthermore, PD-1 + T cells were observed in tumor tissues and were functionally impaired upon engagement by PD-L1 or PD-L2. [14][15][16] As with CTLA-4, blockade of the PD-1/PD-L pathway enhanced antitumor immune responses by restoring T-cell functions. 11 Consistently, blockade of PD-1 or PD-L1 controlled the progression of various cancers and prolonged the survival of advanced pulmonary adenocarcinoma patients in clinical trials.…”
mentioning
confidence: 99%
“…T-cells with an exhausted phenotype can also be found following chronic antigen stimulation in tumors 19,[36][37][38] . Despite showing this phenotype, there is a clear positive correlation between number of CD8 + tumor infiltrating lymphocytes (TIL) and a favorable clinical prognosis 39,40 .…”
Section: Evidence That Functional T-cells Are Maintained In Chronic Imentioning
confidence: 99%
“…Second, specificity may be limited to private (i.e., nonshared) antigens resulting from novel mutations 12. Third, the functional competence of infiltrating lymphocytes may be compromised 11, 13. The latter two observations have strongly influenced recent advances in immunotherapy.…”
mentioning
confidence: 99%