The EACR’s ‘Highlights in Cancer Research’ is a regular summary of the most interesting and impactful recent papers in cancer research, curated by the Board of the European Association for Cancer Research (EACR).
The list below appears in no particular order, and the summary information has been provided by the authors unless otherwise indicated.
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doi: 10.1158/2159-8290.CD-24-0134.
Summary of the findings
Summary of the findingsThis study has uncovered emerging cellular networks that evade the immune system activity within the brain metastatic microenvironment, thereby limiting the efficacy of immunotherapy in symptomatic brain metastases.
We addressed the heterogeneity of astrocytes -key players in the progression of brain metastases- and identified a novel immunosuppressive axis. Specifically, we found that STAT3⁺ astrocytes secrete a molecule called TIMP1, which acts on CD8⁺ lymphocytes via binding to CD63, a receptor enriched on the surface of activated immune cells. This astrocyte-derived signaling mechanism contributes to local immunosuppression, impairing the effectiveness of T cell-mediated anti-tumor responses.
Building on these findings, we successfully applied a combined immunotherapeutic strategy in multiple preclinical models as well as in patient-derived organotypic cultures. This approach involved systemic enhancement of T cell activation using immune checkpoint blockade in conjunction with the local inhibition of TIMP1-mediated immunosuppression.
Furthermore, we demonstrated that cerebrospinal fluid collected via liquid biopsy from patients with brain metastases exhibits significantly elevated TIMP1 levels compared to healthy controls. These findings highlight TIMP1 as a potential biomarker for patient stratification and therapeutic monitoring for this combined immunotherapy strategy.
Future impact
