PXD044794

PXD044794 is an original dataset announced via ProteomeXchange.

Title	Neoantigen targeted dendritic cell vaccine generates durable T cell responses exhibiting the full spectrum of differentiation states in NSCLC patients
Description	Background. Dendritic cell (DC)-based neoantigen vaccination holds potential as a safe and effective adjuvant therapy for patients with early-stage, resectable NSCLC, a tumor type typically characterized by high mutational loads. DCs have the unique ability to elicit robust antitumoral T-cell responses, while neoantigens are ideal targets to elicit high-affinity T cell responses with exquisite tumor specificity. Here, we present the results of a phase I clinical trial in which a novel DC vaccine targeting neoantigens was evaluated in six patients with early stage, resected NSCLC. Methods. Tumor samples were subjected to a comprehensive neoantigen identification approach encompassing genomics, transcriptomics and immunopeptidomics. Using genomics and transcriptopmics data, tumor-specific antigens were identified by a bioinformatics approach. Additionally, immunopeptidomics was performed by immunoprecipitation of human MHC class I molecule followed by immunopeptides enrichment and LC-MS/MS analysis. Two immunopeptidomics screens were performed. In the first immunopeptidomics screen, patient-derived tumors were analyzed to uncover neoepitopes specific for the patient. In the second, screen, patient-derived EBV-immortilized B cell lines overexpressing the selected neoepitopes were analyzed to verify that the predicted neoepitopes can bind to the HLA haplotypes of the patients. For anti-tumor vaccination, patients underwent leukapheresis for the manufacturing of monocyte-derived DCs loaded with neoantigens (Neo-mDCs) according to a four-day protocol. Neo-mDCs were injected intravenously following an intrapatient dose escalation scheme. Primary endpoint of the trial was safety. Secondary endpoints were feasibility, immunogenicity, and relapse-free survival. Results. In the first immunopeptidomics screen, one neoepitopes derived was identified from the tumor of one patient. In the second immunopeptidomics screen, several predicted neoepitopes were confirmed to be presented on the HLA haplotypes of the patients by analyzing the patient-derived EBV-immortilized B cell lines. Additionally, the vaccine was demonstrated to be feasible and safe. T cell responses were observed in 5 of 6 vaccinated patients and were dominated by CD8+ T cells, which could be detected ex vivo at high frequencies >1.5 years after the last dose. Furthermore, single cell analysis indicated that the CD8+ T cell responsive population was polyclonal and exhibited the near entire spectrum of T cell differentiation states, including a naïve-like state associated with long lasting memory but excluding exhausted cell states. Three of six vaccinated patients experienced disease relapse. Conclusion. Neo-mDC vaccination is safe and feasible. Vaccination induces large populations of neoantigen-specific T-cell responses containing long lasting memory and effector cells in early-stage NSCLC patients, suggesting clinical potential.
HostingRepository	PRIDE
AnnounceDate	2024-10-22
AnnouncementXML	Submission_2024-10-22_06:33:45.181.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Fabien Thery
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	acetylated residue; monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Q Exactive HF

Revision	Datetime	Status	ChangeLog Entry
0	2023-08-23 05:59:48	ID requested
1	2024-03-17 04:03:04	announced
⏵ 2	2024-10-22 06:33:45	announced	2024-10-22: Updated project metadata.

Dataset with its publication pending

submitter keyword: Human, cancer, non-small cell lung cancer, vaccine, neoantigen, dendritic cells

Prof. Francis Impens
contact affiliation	VIB-UGent Center for Medical Biotechnology, VIB, Ghent, Belgium. Department of Biomolecular Medicine, Ghent University, Ghent, Belgium. VIB Proteomics Core, VIB, Ghent, Belgium.
contact email	francis.impens@vib-ugent.be
lab head
Fabien Thery
contact affiliation	VIB-UGent
contact email	fabien.thery91@gmail.com
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD044794
     1. Label: PRIDE project
     2. Name: Neoantigen targeted dendritic cell vaccine generates durable T cell responses exhibiting the full spectrum of differentiation states in NSCLC patients