Checkpoint inhibitors (CI) instigate anticancer immunity in many neoplastic diseases, albeit only in a fraction of patients. The clinical success of cyclophosphamide (C)-based haploidentical stem-cell transplants indicates that this drug may re-orchestrate the immune system. Using models of triple-negative breast cancer (TNBC) with different intratumoral immune contexture, we demonstrate that a combinatorial therapy of intermittent C, CI, and vinorelbine activates antigen-presenting cells (APC), and abrogates local and metastatic tumor growth by a T-cell-related effect. Single-cell transcriptome analysis of >50,000 intratumoral immune cells after therapy treatment showed a gene signature suggestive of a change resulting from exposure to a mitogen, ligand, or antigen for which it is specific, as well as APC-to-T-cell adhesion. This transcriptional program also increased intratumoral Tcf1(+) stem-like CD8(+) T cells and altered the balance between terminally and progenitor-exhausted T cells favoring the latter. Overall, our data support the clinical investigation of this therapy in TNBC.Significance: Acombinatorial therapy in mouse models of breast cancer increases checkpoint inhibition by activating anti-genpresenting cells, enhancing intratumoral Tcf1(+) stem-like CD8(+) T cells, and increasing progenitor exhausted CD8thorn T cells.
Cyclophosphamide and Vinorelbine Activate Stem-Like CD8+ T Cells and Improve Anti-PD-1 Efficacy in Triple-Negative Breast Cancer / P. Falvo, S. Orecchioni, R. Hillje, A. Raveane, P. Mancuso, C. Camisaschi, L. Luzi, P. Pelicci, F. Bertolini. - In: CANCER RESEARCH. - ISSN 1538-7445. - 81:3(2021 Feb 01), pp. 685-697. [10.1158/0008-5472.CAN-20-1818]
Cyclophosphamide and Vinorelbine Activate Stem-Like CD8+ T Cells and Improve Anti-PD-1 Efficacy in Triple-Negative Breast Cancer
P. FalvoPrimo
;R. Hillje;C. Camisaschi;P. Pelicci;
2021
Abstract
Checkpoint inhibitors (CI) instigate anticancer immunity in many neoplastic diseases, albeit only in a fraction of patients. The clinical success of cyclophosphamide (C)-based haploidentical stem-cell transplants indicates that this drug may re-orchestrate the immune system. Using models of triple-negative breast cancer (TNBC) with different intratumoral immune contexture, we demonstrate that a combinatorial therapy of intermittent C, CI, and vinorelbine activates antigen-presenting cells (APC), and abrogates local and metastatic tumor growth by a T-cell-related effect. Single-cell transcriptome analysis of >50,000 intratumoral immune cells after therapy treatment showed a gene signature suggestive of a change resulting from exposure to a mitogen, ligand, or antigen for which it is specific, as well as APC-to-T-cell adhesion. This transcriptional program also increased intratumoral Tcf1(+) stem-like CD8(+) T cells and altered the balance between terminally and progenitor-exhausted T cells favoring the latter. Overall, our data support the clinical investigation of this therapy in TNBC.Significance: Acombinatorial therapy in mouse models of breast cancer increases checkpoint inhibition by activating anti-genpresenting cells, enhancing intratumoral Tcf1(+) stem-like CD8(+) T cells, and increasing progenitor exhausted CD8thorn T cells.File | Dimensione | Formato | |
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