The immune system plays a critical role in cancer progression and antitumor responses. Glioblastoma is an aggressive and incurable brain tumor characterized by a highly immunosuppressive microenvironment. Over the past two decades, photodynamic therapy (PDT) has been evaluated as an adjunct to fluorescent-guided resection (FGR) and chemoradiotherapy according to the STUPP protocol, for resectable glioblastomas. In addition to demonstrating the feasibility of such a procedure, two previous clinical trials (INDYGO, NCT03048240; DOSINDYGO, NCT04391062) revealed/highlighted significant systemic immune changes following treatment, including modifications in peripheral blood mononuclear cells (PBMCs) activation and cytokine secretion profiles. However, the specific contribution of PDT remains uncertain due to the combined effects of, on the one hand, PDT and, on the other hand, FGR and chemoradiotherapy. This study aims to evaluate immune parameters in a control population undergoing FGR and chemoradiotherapy only (i.e., without PDT). The objective is to distinguish the immunological impact of PDT from that of FGR and chemoradiotherapy. The results will provide a better understanding of the systemic immune modulation induced by PDT in glioblastoma.
Study Type
OBSERVATIONAL
Enrollment
17
Patients undergo fluorescence-guided resection for glioblastoma. Post-operative management includes standard radiochemotherapy according to the STUPP protocol. Peripheral blood samples are collected longitudinally for immunological analyses (PBMCs, immune activation markers, cytokine profiling). This group serves as a matched control cohort for patients in the INDYGO and DOSINDYGO trials who received PDT in addition to FGR and chemoradiotherapy.
CHU Lille
Lille, France
Evolution of systemic immune response over 6 months following fluorescence-guided resection and during chemoradiotherapy
Systemic immune response will be assessed by longitudinal changes in the proportion of circulating immune cell subsets quantified by flow cytometry and by cytokine concentrations measured through secretome analysis. All measurements will be analyzed as variations relative to a pre-operative baseline to evaluate immune modulation following resection and during chemoradiotherapy.
Time frame: From baseline (pre-surgery) to 6 months post-surgery
Evolution of immune cells transcriptomic profile
Changes in exosome-induced immune cell proliferation are assessed in peripheral blood samples. The immunomodulatory effects of circulating exosomes are evaluated through their capacity to induce proliferation of immune cells over time following surgical resection and during chemoradiotherapy.
Time frame: From baseline (pre-surgery) to 6 months post-surgery
Immunomodulatory effects of circulating exosomes following glioblastoma resection and during chemoradiotherapy
Changes in exosome-induced immune cell proliferation are assessed in peripheral blood samples. The immunomodulatory effects of circulating exosomes are evaluated through their capacity to induce proliferation of immune cells over time following surgical resection and during chemoradiotherapy.
Time frame: From baseline (pre-surgery) to 6 months post-surgery
Nadira Pr DELHEM, PU
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