Identification of Hepatitis C Virus (HCV) Specific T Cells

Status Completed

Clinical Trial Summary

Nearly 175 million people worldwide are infected by Hepatitis C Virus (HCV), close to 3% of the global population. Contrary to other chronic infections such as HIV, clearance of HCV is possible. While much is now known about the response to treatment in chronic HCV patients, the fact that acute HCV infection is typically asymptomatic (~80% of patients show no clinical signs) has made it challenging to define the mechanisms involved in spontaneous clearance.

Immune protection against HCV is thought to be largely dependent upon the CD8 T cell response. Therefore using the latest T cell detection technology the investigators will develop a panel of tetramers specific for all potential HCV epitopes. To produce the tetramers the investigators will utilize HLA ligand exchange technology which allows the production of very large collections of peptide-HLA multimers for T cell staining. The investigators have already performed a large scale identification of HCVg1 and HCVg4 CD8 T cell epitopes using published viral sequences and algorithm prediction databases. Using this information the investigators are currently in the process of developing collections of peptide-HLA multimers for T cell staining. Therefore the investigators require large lymphocyte pools from HCV+ patients to test both the sensitivity and accuracy of each tetramer on the CD3+CD8+ T cells.

The investigators wish to examine cells from patients infected with HCV g1 and HCV g4 to be able to test and compare the frequency of possible conserved epitopes present in both HCVg1 and HCVg4 infections. Once developed this technique will allow us to examine all virus-specific CD8 T cells present in patients with acute or chronic disease, and on smaller quantities of blood. The development of these technologies will also allow us to tailor such future diagnostic tests to local populations where a viral subspecies is prevalent; for example using North-African HLA alleles for HCVg4 epitopes.

The work carried out using such assays will provide important immunological correlates of viral clearance that will impact vaccine design for HCV infections. Finally, the identification of protective CD8 T cells specific for HCV may allow new diagnostic tools with predictive powers of disease progression that can be used on any flow cytometer machine.

Clinical Trial Description

n/a

Study Design

Observational Model: Case-Only, Time Perspective: Prospective

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT01534728
Study type	Observational
Source	Institut National de la Santé Et de la Recherche Médicale, France
Contact
Status	Completed
Phase	N/A
Start date	February 2012
Completion date	March 2014

View Details

See also
Status	Clinical Trial	Phase
Completed	`NCT03686722` - Effect of Co-administration of Metformin and Daclatasvir on the Pharmacokinetis and Pharmacodynamics of Metformin	Phase 1
Recruiting	`NCT04510246` - Link Hepatitis C Notifications to Treatment in Tasmania	N/A
Completed	`NCT03413696` - Effects of Health Literacy and HCV Knowledge on HCV Treatment Willingness in HIV-coinfected Patients
Completed	`NCT03118674` - Harvoni Treatment Porphyria Cutanea Tarda	Phase 2
Completed	`NCT03109457` - Hepatitis C Virus Detection in Oral Squamous Cell Carcinoma
Completed	`NCT01458054` - Effect of Omeprazole and Ritonavir on GSK2336805 Pharmacokinetics in Healthy Adults	Phase 1
Completed	`NCT03740230` - An Observational Study of Maviret (Glecaprevir/Pibrentasvir) for Korean Chronic Hepatitis C Genotypes 1 to 6 Patients According to the Standard for Re-examination of New Drugs
Completed	`NCT03426787` - Helping Empower Liver and Kidney Patients	N/A
Completed	`NCT03627299` - Renal Transplants in Hepatitis C Negative Recipients With Nucleic Acid Positive Donors	Phase 4
Completed	`NCT00006301` - Immune Response to Hepatitis C Virus
Active, not recruiting	`NCT03949764` - The Kentucky Viral Hepatitis Treatment Study	Phase 4
Completed	`NCT03365635` - Administration of Zepatier (Grazoprevir Plus Elbasvir) in Chronic Hemodialysis (HD) Patients With Hepatitis C	Phase 4
Recruiting	`NCT04405024` - Pilot Study on the Feasibility of Systematic Hepatitis C Screening of Hospitalized Patients	N/A
Completed	`NCT04525690` - Improving Inpatient Screening for Hepatitis C	N/A
Completed	`NCT04033887` - Evaluation Study of RDTs Detecting Antibodies Against HCV
Withdrawn	`NCT04546802` - HepATocellular Cancer Hcv Therapy Study	Phase 3
Active, not recruiting	`NCT02961426` - Strategic Transformation of the Market of HCV Treatments	Phase 2/Phase 3
Completed	`NCT02705534` - Sofosbuvir, Ledipasvir, Ribavirin for Hepatitis C Cirrhotics, Genotype 1	Phase 3
Completed	`NCT03186313` - A Study to Evaluate the Safety and Efficacy of the Combined Single Dose of Dactavira Plus Or Dactavira in Egyptian Adults With Chronic Genotype 4 HCV Infection	Phase 3
Completed	`NCT02869776` - Integrating HCV and HIV Screening During the Era of HIV Antigen Testing	N/A

Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Identification of Hepatitis C Virus (HCV) Specific T Cells — TETRA

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms