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Completed

NCT Number: NCT07690943

Evaluation of the Safety and Efficacy of Autologous COVID-19 Antigen Specific T Cell in Prolonged SARS-CoV-2 Patients

The goal of this clinical study is to evaluate the safety and efficacy of autologous COVID-19 antigen specific T cell (LB-DTK-COV19) treatment in prolonged SARS-CoV-2 infected patients. The main questions it aims to answer are:

* What adverse events occur after the infusion of LB-DTK-COV19? * Is there a clinically significant improvement in clinical symptoms within 4 weeks after the infusion? * Is there a clinically significant reduction in SARS-CoV-2 viral load within 4 weeks after the infusion?

The patients will:

* Receive a single infusion of LB-DTK-COV19 either intravenously or using central venous catheter during the baseline visit at a dose of 1x10^7/m^2. * Receive a second infusion of LB-DTK-COV19 either intravenously or using central venous catheter at the same dose 14 days after the first infusion. * Attend follow-up visits at the clinic for 6 months after the first infusion.

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Key information

Conditions

COVID-19 COVID-19 (SARS-CoV-2 Infection) Coronaviridae Infections Coronavirus Infections Infections Lung Diseases Nidovirales Infections Pneumonia Pneumonia, Viral RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Virus Diseases

Age range

19 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

The Catholic University of Korea Seoul St.Mary's Hospital

Seoul, 06591, South Korea

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patients aged 19 years or older.
  • Patients who tested positive for COVID-19 RT-PCR with persistent COVID-19 symptoms and experienced initial symptoms or received a first COVID-19 diagnosis more than 21 days prior to treatment.
  • Given that LB-DTK-COV19 requires 21 days to manufacture, patients who experienced initial symptoms or received a first COVID-19 diagnosis more than 7 days prior to screening may be eligible for enrollment. Following registration, COVID-19 RT-PCR positivity will be reassessed 21 days later. Eligible patients with confirmed positive COVID-19 test results will receive the study product infusion. Patients who test negative for COVID-19 will be withdrawn from the study.
  • Patients who fulfill Inclusion Criteria 2) and are moderately immunocompromised.
  • Patients who fulfill Inclusion Criteria 2) and are refractory to standard of care (including steroids, immunosuppressants, etc depending on the severity of the disease).
  • Patients with a life expectancy longer than 3 months.
  • Patients who have voluntarily decided to participate in this clinical study and have provided written consent to comply with the restrictions.

Exclusion criteria

  • Critically ill patients (WHO ordinal scale, category 7 or higher) who meet any of the following criteria:
  • Require invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO)
  • Diagnosed with acute respiratory distress syndrome (ARDS), shock, or multiple organ failure.
  • Patients with lung diseases other than COVID-19 pneumonia (including chronic obstructive pulmonary disease, asthma, cystic lung disease, tuberculosis, etc)
  • Female subjects who are pregnant, breastfeeding, of childbearing potential, or not using appropriate contraceptive methods.
  • Patients with active infection or fever (≥38°C) of unknown etiology, or ongoing bacterial or fungal infection.
  • Patients aged less than 19 years.
  • Patients who have been diagnosed with HIV, uncontrollable hypertension, unstable angina, congestive heart failure (NY class II or higher), uncontrollable severe diabetes, coronary angioplasty within the past 6 months, acute myocardial infarction or non-malignant disease, including uncontrollable atrial or ventricular fibrillation, within the past 6 months.
  • Uncontrollable hypertension is defined as Systolic BP ≥160 mmHg or Diastolic BP ≥100 mmHg despite taking blood pressure medications.
  • Severe diabetes is defined as follows:
  • Severe hyperglycemia with HbA1c ≥ 10.0%
  • Individuals who have been hospitalized for diabetic ketoacidosis within the past 12 weeks
  • Individuals who have received emergency treatment or been hospitalized within the past 12 weeks for severe hypoglycemia (glucose < 54mg/dL) accompanied by seizures and loss of consciousness
  • Patients with mental illness or drug intoxication that may affect the results of this clinical study.
  • Patients who are participating in another clinical study.
  • Patients deemed ineligible for participation in this clinical study by the investigator.
  • Patients with other severe medical conditions that may compromise compliance with the clinical study.

Treatment and study plan

LB-DTK-COV19

Biological
  • LB-DTK-COV19 is an autologous SARS-CoV-2-specific T cell therapy product derived from a patient and is stored frozen in a colorless, transparent freeze-dried vial until thawed into liquid before administration.

Primary outcomes

  1. Viral load

    Time frame: From the screening visit through 24 weeks after treatment initiation.

    Nasopharyngeal swab samples were used for PCR testing and ELISA to assess SARS-CoV-2 viral load and immunoglobulin levels.

  2. WHO Ordinal Scale

    Time frame: From the screening visit through 24 weeks after treatment initiation.

    The time to improvement in the WHO Ordinal Scale, defined as an improvement of at least 1 point from baseline, is assessed. The outcome is summarized by both the time to improvement and the proportion of participants achieving the improvement by four weeks following LB-DTK-COV19 infusion.

  3. NEWS2 Score

    Time frame: From the screening visit through 24 weeks after treatment initiation.

    The time to achievement of a NEWS2 score of 0 sustained for at least 24 hours is assessed. The outcome is summarized by both the time to achievement and the proportion of participants achieving the endpoint by four weeks following LB-DTK-COV19 infusion.

  4. Chest CT Severity Score

    Time frame: From the screening visit through 24 weeks after treatment initiation.

    Proportion of patients with improvement in chest CT severity scores at four weeks following LB-DTK-COV19 infusion is measured.

  5. Quantification of SARS-CoV-2-Specific T cells

    Time frame: From the baseline visit through 24 weeks after treatment initiation.

    SARS-CoV-2-specific T cells and their subsets are quantified using flow cytometry.

  6. SARS-CoV2-Specific T-cell Responses

    Time frame: From baseline through 24 weeks after treatment initiation.

    SARS-CoV2-specific T-cell responses are assessed using IFN-γ ELISPOT assay and spot-forming units.

  7. Adverse Events

    Time frame: From the baseline visit through 24 weeks after treatment initiation.

    The investigator must confirm the occurrence of adverse events through medical examinations during regular visits throughout the clinical study period. Adverse events shall be assessed at each visit starting from the administration of the investigational drug at the baseline visit.

Sponsors and collaborators

Lead sponsor

LucasBio

Industry

Registry information

Official study title

A Clinical Study to Evaluate the Safety and Efficacy of Autologous COVID-19 Antigen Specific T Cell Treatment in Prolonged SARS-CoV-2 Infected Patients

Important dates

Study start
2023
Primary completion
2024
Study completion
2025
First posted
Jul 8, 2026
Registry last updated
Jul 8, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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