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Delayed Effect of Dendritic Cells Vaccination on Survival in Glioblastoma: A Systematic Review and Meta-Analysis

Overview
Journal Curr Oncol
Publisher MDPI
Specialty Oncology
Date 2022 Feb 24
PMID 35200574
Authors
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Abstract

Background: Dendritic cell vaccination (DCV) strategies, thanks to a complex immune response, may flare tumor regression and improve patients' long-term survival. This meta-analysis aims to assess the efficacy of DCV for newly diagnosed glioblastoma patients in clinical trials.

Methods: The study databases, including PubMed, Web of Knowledge, Google Scholar, Scopus, and Cochrane, were searched by two blinded investigators considering eligible studies based on the following keywords: "glioblastoma multiforme", "dendritic cell", "vaccination", "immunotherapy", "immune system", "immune response", "chemotherapy", "recurrence", and "temozolomide". Among the 157 screened, only 15 articles were eligible for the final analysis.

Results: Regimens including DCV showed no effect on 6-month progression-free survival (PFS, HR = 1.385, 95% CI: 0.822-2.335, = 0.673) or on 6-month overall survival (OS, HR = 1.408, 95% CI: 0.882-2.248, = 0.754). In contrast, DCV led to significantly longer 1-year OS (HR = 1.936, 95% CI: 1.396-2.85, = 0.001) and longer 2-year OS (HR = 3.670, 95% CI: 2.291-5.879, = 0.001) versus control groups. Hence, introducing DCV could lead to increased 1 and 2-year survival of patients by 1.9 and 3.6 times, respectively.

Conclusion: Antitumor regimens including DCV can effectively improve mid-term survival in patients suffering glioblastoma multiforme (GBM), but its impact emerges only after one year from vaccination. These data indicate the need for more time to achieve an anti-GBM immune response and suggest additional therapeutics, such as checkpoint inhibitors, to empower an earlier DCV action in patients affected by a very poor prognosis.

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