PD-1+ Polyfunctional T Cells Dominate the Periphery after Tumor-Infiltrating Lymphocyte Therapy for Cancer

Marco Donia, Julie Westerlin Kjeldsen, Rikke Andersen, Marie Christine Wulff Westergaard, Valentina Bianchi, Mateusz Legut, Meriem Attaf, Barbara Szomolay, Sascha Ott, Garry Dolton, Rikke Lyngaa, Sine Reker Hadrup, Andrew K Sewell, Inge Marie Svane

23 Citationer (Scopus)

Abstract

Purpose: Infusion of highly heterogeneous populations of autologous tumor-infiltrating lymphocytes (TIL) can result in tumor regression of exceptional duration. Initial tumor regression has been associated with persistence of tumor-specific TILs 1 month after infusion, but mechanisms leading to long-lived memory responses are currently unknown. Here, we studied the dynamics of bulk tumor-reactive CD8þ T-cell populations in patients with metastatic melanoma following treatment with TILs. Experimental Design: We analyzed the function and phenotype of tumor-reactive CD8þ T cells contained in serial blood samples of 16 patients treated with TILs. Results: Polyfunctional tumor-reactive CD8þ T cells accumulated over time in the peripheral lymphocyte pool. Combinatorial analysis of multiple surface markers (CD57, CD27, CD45RO, PD-1, and LAG-3) showed a unique differentiation pattern of polyfunctional tumor-reactive CD8þ T cells, with highly specific PD-1 upregulation early after infusion. The differentiation and functional status appeared largely stable for up to 1 year after infusion. Despite some degree of clonal diversification occurring in vivo within the bulk tumor-reactive CD8þ T cells, further analyses showed that CD8þ T cells specific for defined tumor antigens had similar differentiation status. Conclusions: We demonstrated that tumor-reactive CD8þ T-cell subsets that persist after TIL therapy are mostly polyfunctional, display a stable partially differentiated phenotype, and express high levels of PD-1. These partially differentiated PD-1þ polyfunctional TILs have a high capacity for persistence and may be susceptible to PD-L1/PD-L2–mediated inhibition.

OriginalsprogEngelsk
TidsskriftClinical Cancer Research
Vol/bind23
Udgave nummer19
Sider (fra-til)5779-5788
ISSN1078-0432
DOI
StatusUdgivet - 1 okt. 2017

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