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Clinical Trial NCT05993299 for Neoplasms is active, not recruiting. See the Trial Radar Card View and AI discovery tools for all the details. Or ask anything here.
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Study to Evaluate Safety and Antitumor Activity of Lete-Cel (GSK3377794) in HLA-A2+ Participants With NY-ESO-1 Positive Previously Untreated Advanced (Metastatic or Unresectable) Synovial Sarcoma and Myxoid/Round Cell Liposarcoma Phase 2 7

Active, not recruiting
Clinical Trial NCT05993299 is designed to study Treatment for Neoplasms. It is a Phase 2 interventional study that is active, not recruiting, having started on December 31, 2019, with plans to enroll 7 participants. Led by USWM, LLC (dba US WorldMeds), it is expected to complete by July 1, 2026. The latest data from ClinicalTrials.gov was last updated on March 11, 2026.
Brief Summary
This trial will evaluate safety and efficacy of human engineered T-cell therapies, in participants with advanced tumors. This trial is a sub study of the Master study NCT03967223.
Official Title

Evaluation of Safety and Antitumor Activity of Lete-Cel (GSK3377794) in HLA-A2+ Participants With NY-ESO-1 Positive Previously Untreated Advanced (Metastatic or Unresectable) Synovial Sarcoma and Myxoid/Round Cell Liposarcoma

Conditions
Neoplasms
Other Study IDs
  • 208467 Substudy 1
NCT ID Number
Start Date (Actual)
2019-12-31
Last Update Posted
2026-03-11
Completion Date (Estimated)
2026-07-01
Enrollment (Estimated)
7
Study Type
Interventional
PHASE
Phase 2
Status
Active, not recruiting
Keywords
Adoptive T-cell therapy
Letetresgene autoleucel
Lete-cel
GSK3377794
Primary Purpose
Treatment
Design Allocation
N/A
Interventional Model
Single Group
Masking
None (Open Label)
Arms / Interventions
Participant Group/ArmIntervention/Treatment
ExperimentalLetetresgene autoleucel
Letetresgene autoleucel
Letetresgene autoleucel will be administered.
Cyclophosphamide
Cyclophosphamide will be used as a lymphodepleting chemotherapy.
Fludarabine
Fludarabine will be used as a lymphodepleting chemotherapy.
Primary Outcome Measures
Outcome MeasureMeasure DescriptionTime Frame
Overall Response Rate (ORR)
ORR is defined as the percentage of participants with a confirmed complete response (CR) or confirmed partial response (PR) via investigator assessment per Response Evaluation Criteria in Solid Tumors Criteria (RECIST) version 1.1 relative to the total number of participants in the analysis population. CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (\<)10 millimeters (mm). PR is defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference, the baseline sum of the diameters (e.g., percent change from baseline). 95% CI is based on Clopper-Pearson exact confidence interval.
Up to approximately 36 months
Secondary Outcome Measures
Outcome MeasureMeasure DescriptionTime Frame
Time to Response (TTR)
Time to response was defined as the interval of time between the date of T-cell infusion and the first documented evidence of the confirmed response (PR or CR), in the subset of participants with a confirmed PR or CR as their best confirmed overall response. CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (\<)10 millimeters (mm). PR is defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference, the baseline sum of the diameters (e.g., percent change from baseline).
Up to approximately 54 months
Duration of Response (DOR)
Duration of response was defined as the interval between the initial date of confirmed response (PR/CR) and the date of progressive disease as assessed by local investigators, or death among participants with a confirmed response per RECIST 1.1. CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (\<)10 millimeters (mm). PR is defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference, the baseline sum of the diameters (e.g., percent change from baseline).
Up to approximately 54 months
Disease Control Rate (DCR)
DCR is defined as the percentage of participants with a confirmed CR, PR, or stable disease (SD) with a minimal 12 weeks (84 days ± 7 day window) duration relative to the total number of participants within the analysis population at the time of primary analysis as determined by local investigators per RECIST v1.1. CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (\<)10 millimeters (mm). PR is defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference, the baseline sum of the diameters (e.g., percent change from baseline). SD is defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease. The disease progression (PD) is defined as the date of radiological disease progression based on imaging data per RECIST v1.1. 95% CI is based on Clopper-Pearson exact confidence interval.
Up to approximately 36 months
Progression Free Survival (PFS)
PFS is defined as the interval of time between from the date of T-cell infusion to the earliest date of radiological progression of disease (PD) as assessed by local investigator per RECIST v1.1, or death due to any cause. The PD is defined as the date of radiological disease progression based on imaging data per RECIST v1.1.
Up to approximately 54 months
Number of Participants With Treatment Emergent Adverse Events (TEAEs) and Treatment Emergent Serious Adverse Events (TESAEs)
An AE is any untoward medical occurrence in a clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. SAE is defined as any untoward medical occurrence that, at any dose results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations which involve medical or scientific judgment or is associated with liver injury and impaired liver function.
Up to approximately 54 months
Number of Participants With AEs of Special Interest (AESIs)
An AESI may be of scientific and medical concern related to the treatment, monitored, and rapidly communicated by investigator to sponsor. AESIs included cytokine release syndrome (CRS), hematopoietic cytopenias (including pancytopenia and aplastic anemia), graft vs host disease (GVHD), ICANS, Guillain-Barre syndrome, treatment-related inflammatory response at tumor site(s), and neutropenia Grade 4 lasting ≥28 days.
Up to approximately 54 months
Number of Participants With TEAEs and TESAEs by Severity
An AE is any untoward medical occurrence in a clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. SAE is defined as any untoward medical occurrence that, at any dose results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, other situations which involve medical or scientific judgment or is associated with liver injury and impaired liver function. AEs and SAEs were graded according to National Cancer Institute-Common Toxicity Criteria for Adverse Events (NCI-CTCAE) version 5.0. Grade 1- Mild; Grade 2- Moderate; Grade 3- Severe or medically significant but not immediately life-threatening; Grade 4- Life-threatening consequences; Grade 5- Death related to AE.
Up to approximately 54 months
Number of Participants With AESIs by Severity
An AESI may be of scientific and medical concern related to the treatment, monitored, and rapidly communicated by investigator to sponsor. AESIs included cytokine release syndrome (CRS), hematopoietic cytopenias (including pancytopenia and aplastic anemia), graft vs host disease (GVHD), ICANS, Guillain-Barre syndrome, treatment-related inflammatory response at tumor site(s), and neutropenia Grade 4 lasting ≥28 days.
Up to approximately 54 months
Percentage of Participants With Replication Competent Lentivirus (RCL) Positive
RCL was monitored using a polymerase chain reaction (PCR)-based assay that detects and measures copies of the gene coding for the vector's envelope protein, namely vesicular stomatitis virus G protein (VSV-G).
Up to approximately 54 months
Instances of Insertional Oncogenesis (IO)
Instances of Insertional Oncogenesis (IO) was summarized descriptively.
Up to approximately 54 months
Maximum Transgene Expansion (Cmax)
Cmax was defined as maximum observed persistence, determined directly from the persistence-time data. Blood samples were collected for PK analysis.
Day 1 to Day 14
Time to Cmax (Tmax)
Tmax was defined as time to reach Cmax, determined directly from the persistence-time data. Blood samples were collected for PK analysis.
Day 1 to Day 14
Area Under the Time Curve From Zero to Time 28 Days (AUC[0-28])
Area under the persistence-time curve from time zero to Day 28. Blood samples were collected for PK analysis.
Up to 28 days
Participation Assistant
Eligibility Criteria

Eligible Ages
Child, Adult, Older Adult
Minimum Age
10 Years
Eligible Sexes
All
  • Participant must be greater than or equal to 10 years of age on the day of signing informed consent.
  • Participant scheduled to receive clinical drug product supply must also weigh ≥40 kg
  • Participant must be positive for HLA-A*02:01, HLA-A*02:05, and/or HLA-A*02:06 alleles by a designated central laboratory
  • Participant's tumor is positive for NY-ESO-1 expression by a designated central laboratory.
  • Participant has a diagnosis of synovial sarcoma (SS) or myxoid/round cell liposarcoma (MRCLS)
  • Performance status: dependent on age - Lansky > 60, Karnofsky > 60, Eastern
  • Cooperative Oncology Group 0-1.
  • Participant must have adequate organ function and blood cell counts, within 7 days prior to leukapheresis.
  • At time of treatment, participant has measurable disease according to RECIST v1.1.
  • Male or female. Contraception requirements will apply at the time of leukapheresis and treatment.
  • Consultation for prior history per protocol specifications.

  • Central nervous system metastases.
  • Any other prior malignancy that is not in complete remission.
  • Clinically significant systemic illness (.(Serious active infections or significant cardiac, pulmonary, hepatic or other organ dysfunction, that in the judgment of the Investigator would compromise the participant's ability to tolerate protocol therapy or significantly increase the risk of complications)
  • Prior or active demyelinating disease.
  • History of chronic or recurrent (within the last year prior to leukapheresis) severe autoimmune or immune mediated disease (e.g. Crohn's disease, systemic lupus) requiring steroids or other immunosuppressive treatments.
  • Previous treatment with genetically engineered NY-ESO-1-specific T cells.
  • Previous NY-ESO-1 vaccine or NY-ESO-1 targeting antibody.
  • Prior gene therapy using an integrating vector.
  • Previous allogeneic hematopoietic stem cell transplant.
  • Washout periods for prior radiotherapy and systemic chemotherapy must be followed.
  • Participant had major surgery in less than or equal to 28 days of first dose of study intervention.
  • Prior radiation exceeds protocol specified limits.
USWM, LLC (dba US WorldMeds) logoUSWM, LLC (dba US WorldMeds)
No contact data.
38 Study Locations in 7 Countries

California

City of Hope National Medical Center, Duarte, California, 91010, United States
Stanford Hospital and Clinics, Stanford, California, 94305, United States

Colorado

Sarah Cannon Research Institute, Denver, Colorado, 80218, United States

Florida

Mayo Clinic Jacksonville, Jacksonville, Florida, 32224, United States

Illinois

University of Chicago, Chicago, Illinois, 60637, United States

Iowa

University of Iowa College of Medicine, Iowa City, Iowa, 52242-1009, United States

Massachusetts

Dana Farber Cancer Institute, Boston, Massachusetts, 02114, United States
Massachusetts General Hospital, Boston, Massachusetts, 02114, United States

Michigan

University of Michigan Medical Center, Ann Arbor, Michigan, 48109, United States

Minnesota

Minnesota Oncology Hematology, Minneapolis, Minnesota, 55455, United States
Mayo Clinic Rochester, Rochester, Minnesota, 55905, United States

Missouri

Washington University, St Louis, Missouri, 63110, United States

New York

Memorial Sloan Kettering cancer center, New York, New York, 10065, United States

North Carolina

Duke University Medical Center, Durham, North Carolina, 27710, United States

Ohio

Ohio State University-Columbus, Columbus, Ohio, 43210, United States

Oregon

Oregon Health and Science University, Portland, Oregon, 97239, United States

Pennsylvania

University of Pittsburgh, Hillman Cancer centre, Pittsburgh, Pennsylvania, 15232, United States

Tennessee

Tennessee Oncology, Nashville, Tennessee, 37203, United States

Texas

University Of Texas Southwestern Medical Center, Dallas, Texas, 75390-8565, United States
University of Texas Southwestern Medical Center, Dallas, Texas, 75390-9063, United States

Utah

University of Utah, Salt Lake City, Utah, 84112, United States

Virginia

Virginia Commonwealth University, Richmond, Virginia, 23298, United States

Washington

Fred Hutchinson Cancer Research Center, Seattle, Washington, 98109-1024, United States

Wisconsin

Froedtert Hospital, Milwaukee, Wisconsin, 53226, United States

Quebec

CIUSSS de L'Est-De-Lile-De-Montreal, Montreal, Quebec, H1T 2M4, Canada
Princess Margaret Cancer Centre, Toronto, M5G 2M9, Canada
Centre Léon Bérard, Lyon, 69373, France
CHU de Bordeaux GH Sud Hôpital Haut Lévêque, Pessac, 33604, France
Fondazione IRCCS Instituto Nazionale Dei Tumori, Milan, 20133, Italy
Ircss Istituto Clinico Humanitas, Romano di Lombardia, 20089, Italy
The Netherlands Cancer Institute, Amsterdam, 1066 CX, Netherlands
Hospital Santa Creu Y Sant Pau, Barcelona, 08025, Spain
Ico Duran y Reynals l'Hospitalet de Llobrega, Hospitalet de Llobregat, Barcelona, 08907, Spain
Hospital Universitario Fundación Jiménez Díaz, Madrid, 28040, Spain
Hospital Virgen Del Rocio, Seville, 41013, Spain
Royal Marsden Hospital, London, SW3 6JJ, United Kingdom
University College Hospital-London, London, WC1E 6AG, United Kingdom
Christie Hospital NHS Foundation Trust, Manchester, M20 4BX, United Kingdom