Increasing Tumor-Infiltrating T Cells through Inhibition of CXCL12 with NOX-A12 Synergizes with PD-1 Blockade.

Abstract:

:Immune checkpoint inhibitors promote T cell-mediated killing of cancer cells; however, only a subset of patients benefit from the treatment. A possible reason for this limitation may be that the tumor microenvironment (TME) is immune privileged, which may exclude cytotoxic T cells from the vicinity of cancer cells. The chemokine CXCL12 is key to the TME-driven immune suppression. In this study, we investigated the potential of CXCL12 inhibition by use of the clinical-stage l-RNA-aptamer NOX-A12 (olaptesed pegol) to increase the number of tumor-infiltrating lymphocytes. We used heterotypic tumor-stroma spheroids that mimic a solid tumor with a CXCL12-abundant TME. NOX-A12 enhanced the infiltration of T and NK cells in a dose-dependent manner. NOX-A12 and PD-1 checkpoint inhibition synergistically activated T cells in the spheroids, indicating that the agents complement each other. The findings were validated in vivo in a syngeneic murine model of colorectal cancer in which the addition of NOX-A12 improved anti-PD-1 therapy. Taken together, our work shows that CXCL12 inhibition can break the immune-privileged status of the TME by paving the way for immune effector cells to enter into the tumor, thereby broadening the applicability of checkpoint inhibitors in cancer patients. Cancer Immunol Res; 5(11); 950-6. ©2017 AACR.

journal_name

Cancer Immunol Res

authors

Zboralski D,Hoehlig K,Eulberg D,Frömming A,Vater A

doi

10.1158/2326-6066.CIR-16-0303

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

950-956

issue

11

eissn

2326-6066

issn

2326-6074

pii

2326-6066.CIR-16-0303

journal_volume

5

pub_type

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