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• W4361946178 abstract "<div>Abstract<p><b>Purpose:</b> Survival for pancreatic ductal adenocarcinoma (PDAC) patients is extremely poor and improved therapies are urgently needed. Tumor-infiltrating lymphocyte (TIL) adoptive cell therapy (ACT) has shown great promise in other tumor types, such as metastatic melanoma where overall response rates of 50% have been seen. Given this success and the evidence showing that T-cell presence positively correlates with overall survival in PDAC, we sought to enrich for CD8⁺ TILs capable of autologous tumor recognition. In addition, we explored the phenotype and T-cell receptor repertoire of the CD8⁺ TILs in the tumor microenvironment.</p><p><b>Experimental Design:</b> We used an agonistic 4-1BB mAb during the initial tumor fragment culture to provide 4-1BB costimulation and assessed changes in TIL growth, phenotype, repertoire, and antitumor function.</p><p><b>Results:</b> Increased CD8⁺ TIL growth from PDAC tumors was achieved with the aid of an agonistic 4-1BB mAb. Expanded TILs were characterized by an activated but not terminally differentiated phenotype. Moreover, 4-1BB stimulation expanded a more clonal and distinct CD8⁺ TIL repertoire than IL2 alone. TILs from both culture conditions displayed MHC class I-restricted recognition of autologous tumor targets.</p><p><b>Conclusions:</b> Costimulation with an anti-4-1BB mAb increases the feasibility of TIL therapy by producing greater numbers of these tumor-reactive T cells. These results suggest that TIL ACT for PDAC is a potential treatment avenue worth further investigation for a patient population in dire need of improved therapy. <i>Clin Cancer Res; 23(23); 7263–75. ©2017 AACR</i>.</p></div>" @default.
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• W4361946178 date "2023-03-31" @default.
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• W4361946178 title "Data from 4-1BB Agonist Focuses CD8⁺ Tumor-Infiltrating T-Cell Growth into a Distinct Repertoire Capable of Tumor Recognition in Pancreatic Cancer" @default.
• W4361946178 doi "https://doi.org/10.1158/1078-0432.c.6526536" @default.
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