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Study of GSK3845097 in Previously Treated Participants With Advanced Synovial Sarcoma and Myxoid/Round Cell Liposarcoma

Assessment of Safety and Recommended Phase 2 Dose of Autologous T Cells Engineered With an Affinity-enhanced TCR Targeting NY ESO 1 and LAGE 1a, and Co-expressing the dnTGF-βRII (GSK3845097) in Participants With NY ESO 1 and/or LAGE 1a Positive Previously Treated Advanced (Metastatic or Unresectable) Synovial Sarcoma and Myxoid/Round Cell Liposarcoma

Status
Terminated
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05943990
Enrollment
5
Registered
2023-07-13
Start date
2020-12-21
Completion date
2022-10-24
Last updated
2024-11-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Neoplasms

Keywords

Adoptive T-cell therapy, Advanced synovial sarcoma, Advanced Myxoid/Round Cell Liposarcoma, Advanced tumors, GSK3845097, T cell receptor, Leukapheresis

Brief summary

To assess the safety, tolerability and determine recommended phase 2 dose (RP2D) of GSK3845097 in HLA-A\*02:01, HLA-A\*02:05 and/or HLA-A\*02:06 positive participants with New York esophageal squamous cell carcinoma (NY-ESO)-1 and/or Cancer testis antigen 2 (LAGE-1a) positive, previously treated, advanced (metastatic or unresectable) Synovial Sarcoma (SS) and Myxoid/Round Cell Liposarcoma (MRCLS).

Detailed description

This study is a substudy of the Master record - (209012) NCT04526509.

Interventions

GSK3845097 was administered.

DRUGCyclophosphamide

Cyclophosphamide was administered as lymphodepleting chemotherapy.

DRUGFludarabine

Fludarabine was administered as lymphodepleting chemotherapy.

Sponsors

Adaptimmune
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Participant must be \>=18 years of age and weighs ≥40 kg on the day of signing informed consent * Participant must be positive for HLA-A\*02:01, HLA-A\*02:05, and/or HLA-A\*02:06 alleles * Participant's tumor must have tested positive for NY-ESO-1 and/or LAGE-1a expression by a GSK designated laboratory * Performance status: Eastern Cooperative Oncology Group of 0-1 * Participant must have adequate organ function and blood cell counts 7 days prior to leukapheresis * Participant must have measurable disease according to RECIST v1.1. * Participant has advanced (metastatic or unresectable) SS or MRCLS confirmed by local histopathology with evidence of disease-specific translocation * Participant has completed at least one standard of care (SOC) treatment including anthracycline containing regimen unless intolerant to or ineligible to receive the therapy. * Participants who are not candidates to receive anthracycline should have received ifosfamide unless also intolerant to or ineligible to receive ifosfamide. Participants who received neoadjuvant/adjuvant anthracycline or ifosfamide based therapy and progressed will be eligible

Exclusion criteria

* Central nervous system (CNS) metastases, with certain exceptions for CNS metastases in NSCLC as specified in the protocol * Any other prior malignancy that is not in complete remission * Clinically significant systemic illness * Prior or active demyelinating disease * History of chronic or recurrent (within the last year prior to leukapheresis) severe autoimmune or immune mediated disease requiring steroids or other immunosuppressive treatments * Previous treatment with genetically engineered NY-ESO-1-specific T cells, NY-ESO-1 vaccine or NY-ESO-1 targeting antibody * Prior gene therapy using an integrating vector * Previous allogeneic hematopoietic stem cell transplant within the last 5 years or solid organ transplant * Washout periods for prior radiotherapy and systemic chemotherapy must be followed * Major surgery within 4 weeks prior to lymphodepletion * Pregnant or breastfeeding females

Design outcomes

Primary

MeasureTime frameDescription
Number of Participants With Dose Limiting Toxicities (DLTs)Up to 28 daysDLT events were graded according to NCI-CTCAE v5.0. DLTs were defined as Grade (Gr) 4 (life-threatening and death) related to GSK3845097 2) Gr 3 (Severe or medically significant) at least possibly related to GSK3845097 and do not resolve to Gr \<=1 (or Baseline) within 7 days from the onset of the event 3) Gr \>=3 non-infectious pneumonitis not responding to oxygen supplementation and systemic steroid treatment 4) Any Gr 3 cytokine release syndrome (CRS) at least possibly related to GSK3845097 that does not improve to Gr \<2 (moderate) toxicity within 7 days with or without dexamethasone 5) Any Gr 4 CRS at least possibly related to study product that does not improve to Gr \<=2 (or Baseline) within 7 days 6) Any Gr 3 or greater neurotoxicity that does not resolve to Gr \<=2 within 72 hours 7) Any Gr \>=3 organ toxicity (exclusive of CRS toxicity) involving major organ systems that persists for \>72 hours and occurs within 28 days of infusion.
Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeverityUp to approximately 21 monthsAn adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. SAE is defined as any untoward medical occurrence that, at any dose can result in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent disability/incapacity, is a congenital anomaly/birth or is medically significant or requires intervention to prevent one or the outcomes listed above. AEs and SAEs were graded according to NCI-CTCAE v5.0. 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. AEs which start or worsen on or after T-cell infusion are classified as treatment emergent. SAEs are subset of AEs. Results for maximum severity grades has been presented.
Number of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Up to approximately 21 monthsAn AESI may be of scientific and medical concern related to the treatment, monitored, and rapidly communicated by investigator to sponsor. AESIs included events of Cytokine Release Syndrome (CRS), Haematopoietic cytopenias (including pancytopenia and aplastic anaemia), Graft versus Host Disease (GvHD), Immune Effector-Cell Associated Neurotoxicity Syndrome (ICANS), Guillain-Barre Syndrome (GBS), Pneumonitis and treatment-related inflammatory response at tumor site(s) and Neutropenia Grade 4 lasting more than or equal to 28 days. AEs which start or worsen on or after T-cell infusion are classified as treatment emergent.

Secondary

MeasureTime frameDescription
Time to Cmax (Tmax) of GSK3845097Up to 21 daysTmax was defined as time to peak cell expansion during the interventional phase. Blood samples were collected to measure Tmax.
Overall Response Rate (ORR) Assessed by Investigator According to RECIST v1.1Up to approximately 21 monthsOverall response rate (ORR) 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. Partial response (PR) was defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as reference the baseline sum diameters. Complete response (CR) was defined as the 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). Confidence intervals (CI) were calculated using the exact (Clopper-Pearson) method.
Area Under the Time Curve From Zero to Time 28 Days (AUC[0-28])Up to 28 daysArea under the cell expansion-time curve from first T-cell infusion to Day 28. Blood samples were collected to measure AUC (0-28 days).
Duration of Response (DoR)Up to approximately 21 monthsDoR is defined as the interval of time (in months) from first documented evidence of the confirmed response (PR or CR) as assessed by local investigators to the date of disease progression per RECIST v1.1 or death due to any cause, among participants with a confirmed response of PR or CR. PR was defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as reference the baseline sum diameters. CR was defined as the disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \<10 mm.
Maximum Transgene Expansion (Cmax) of GSK3845097Up to 21 daysCmax was defined as peak cell expansion during the interventional phase. Blood samples were collected to measure Cmax.

Countries

Australia, Canada, Germany, Netherlands, Sweden, United States

Participant flow

Pre-assignment details

This study is a sub study of the master protocol (NCT04526509). This sub study was terminated due to a change in GSK's R&D priorities.

Participants by arm

ArmCount
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced Cells
Eligible participants were leukapheresed to manufacture engineered T cells. Participants then received 1 × 10\^9 - 8 × 10\^9 cells of GSK3845097 as an intravenous (IV) infusion in two aliquots (approximately 30% on Day 1 and approximately 70% on Day 8) for sentinel participants or all at once on Day 1 for all other participants after completing lymphodepleting chemotherapy regimen that generally consisted of 30 milligram (mg)/meter (m)\^2/day fludarabine for 4 days (Day -7 to -4) and 900mg/ m\^2/day cyclophosphamide for 3 days (Day -6 to -4).
2
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced Cells
Eligible participants were leukapheresed to manufacture engineered T cells. Participants then received 0.1 × 10\^9 - 0.8 × 10\^9 cells of GSK3845097 as an intravenous (IV) infusion on Day 1 after completing lymphodepleting chemotherapy regimen that generally consisted of 30 milligram (mg)/meter (m)\^2/day fludarabine for 4 days (Day -7 to -4) and 900mg/ m\^2/day cyclophosphamide for 3 days (Day -6 to -4).
2
No Treatment
No Treatment arm consists of participants who underwent leukapheresis but did not go on to receive lymphodepletion chemotherapy and T cell infusion.
1
Total5

Withdrawals & dropouts

PeriodReasonFG000FG001FG002
Overall StudyStudy Terminated by Sponsor001

Baseline characteristics

CharacteristicGSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsGSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNo TreatmentTotal
Age, Continuous29.0 Years
STANDARD_DEVIATION 2.83
60.0 Years
STANDARD_DEVIATION 9.9
41.0 Years43.8 Years
STANDARD_DEVIATION 16.41
Age, Customized
<=17 years
0 Participants0 Participants0 Participants0 Participants
Age, Customized
18-64 years
2 Participants1 Participants1 Participants4 Participants
Age, Customized
>=65 years
0 Participants1 Participants0 Participants1 Participants
Race/Ethnicity, Customized
Black or African American
1 Participants0 Participants0 Participants1 Participants
Race/Ethnicity, Customized
White
1 Participants2 Participants1 Participants4 Participants
Region of Enrollment
Germany
0 Participants1 Participants1 Participants2 Participants
Region of Enrollment
Sweden
0 Participants1 Participants0 Participants1 Participants
Region of Enrollment
United States
2 Participants0 Participants0 Participants2 Participants
Sex: Female, Male
Female
0 Participants0 Participants0 Participants0 Participants
Sex: Female, Male
Male
2 Participants2 Participants1 Participants5 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
deaths
Total, all-cause mortality
0 / 22 / 20 / 1
other
Total, other adverse events
2 / 22 / 20 / 1
serious
Total, serious adverse events
1 / 22 / 20 / 1

Outcome results

Primary

Number of Participants With Dose Limiting Toxicities (DLTs)

DLT events were graded according to NCI-CTCAE v5.0. DLTs were defined as Grade (Gr) 4 (life-threatening and death) related to GSK3845097 2) Gr 3 (Severe or medically significant) at least possibly related to GSK3845097 and do not resolve to Gr \<=1 (or Baseline) within 7 days from the onset of the event 3) Gr \>=3 non-infectious pneumonitis not responding to oxygen supplementation and systemic steroid treatment 4) Any Gr 3 cytokine release syndrome (CRS) at least possibly related to GSK3845097 that does not improve to Gr \<2 (moderate) toxicity within 7 days with or without dexamethasone 5) Any Gr 4 CRS at least possibly related to study product that does not improve to Gr \<=2 (or Baseline) within 7 days 6) Any Gr 3 or greater neurotoxicity that does not resolve to Gr \<=2 within 72 hours 7) Any Gr \>=3 organ toxicity (exclusive of CRS toxicity) involving major organ systems that persists for \>72 hours and occurs within 28 days of infusion.

Time frame: Up to 28 days

Population: DLT Evaluable included participants in the mITT population (all ITT participants (All participants who started leukapheresis procedure) who received any dose of New York esophageal antigen-1 \[NY ESO 1\] specific T cells) who are part of the dose confirmation phase that either had a DLT or have completed the DLT assessment period of 28 days since last T cell infusion.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Dose Limiting Toxicities (DLTs)1 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Dose Limiting Toxicities (DLTs)2 Participants
Primary

Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum Severity

An adverse event (AE) is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. SAE is defined as any untoward medical occurrence that, at any dose can result in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent disability/incapacity, is a congenital anomaly/birth or is medically significant or requires intervention to prevent one or the outcomes listed above. AEs and SAEs were graded according to NCI-CTCAE v5.0. 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. AEs which start or worsen on or after T-cell infusion are classified as treatment emergent. SAEs are subset of AEs. Results for maximum severity grades has been presented.

Time frame: Up to approximately 21 months

Population: Modified intent-to-treat (mITT) population included all ITT participants (All participants who started leukapheresis procedure) who received any dose of NY ESO 1 specific T cells.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeverityAEs-Grade 42 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeverityAEs-Grade 50 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeveritySAEs-Grade 41 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeveritySAEs-Grade 50 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeveritySAEs-Grade 52 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeverityAEs-Grade 40 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeveritySAEs-Grade 40 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events (AEs) and Serious AEs Based on Maximum SeverityAEs-Grade 52 Participants
Primary

Number of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)

An AESI may be of scientific and medical concern related to the treatment, monitored, and rapidly communicated by investigator to sponsor. AESIs included events of Cytokine Release Syndrome (CRS), Haematopoietic cytopenias (including pancytopenia and aplastic anaemia), Graft versus Host Disease (GvHD), Immune Effector-Cell Associated Neurotoxicity Syndrome (ICANS), Guillain-Barre Syndrome (GBS), Pneumonitis and treatment-related inflammatory response at tumor site(s) and Neutropenia Grade 4 lasting more than or equal to 28 days. AEs which start or worsen on or after T-cell infusion are classified as treatment emergent.

Time frame: Up to approximately 21 months

Population: Modified intent-to-treat (mITT) population included all ITT participants (All participants who started leukapheresis procedure) who received any dose of NY ESO 1 specific T cells.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Immune Effector-Cell Associated Neurotoxicity Syndrome1 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Participants with any AESI2 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Cytokine Release Syndrome (CRS)2 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Graft versus host disease1 Participants
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Haematopoietic cytopenias (including pancytopenia and aplastic anaemia)2 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Haematopoietic cytopenias (including pancytopenia and aplastic anaemia)2 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Graft versus host disease1 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Participants with any AESI2 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Immune Effector-Cell Associated Neurotoxicity Syndrome1 Participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsNumber of Participants With Treatment Emergent Adverse Events of Special Interest (AESI)Cytokine Release Syndrome (CRS)2 Participants
Secondary

Area Under the Time Curve From Zero to Time 28 Days (AUC[0-28])

Area under the cell expansion-time curve from first T-cell infusion to Day 28. Blood samples were collected to measure AUC (0-28 days).

Time frame: Up to 28 days

Population: Pharmacokinetic population included participants from the mITT population for whom at least one persistence sample was obtained, analyzed, and was measurable.

ArmMeasureValue (GEOMETRIC_MEAN)Dispersion
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsArea Under the Time Curve From Zero to Time 28 Days (AUC[0-28])730937.83 Days*copies per microgram genomic DNAGeometric Coefficient of Variation 151.154
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsArea Under the Time Curve From Zero to Time 28 Days (AUC[0-28])1325540.63 Days*copies per microgram genomic DNAGeometric Coefficient of Variation 4.115
Secondary

Duration of Response (DoR)

DoR is defined as the interval of time (in months) from first documented evidence of the confirmed response (PR or CR) as assessed by local investigators to the date of disease progression per RECIST v1.1 or death due to any cause, among participants with a confirmed response of PR or CR. PR was defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as reference the baseline sum diameters. CR was defined as the disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \<10 mm.

Time frame: Up to approximately 21 months

Population: Modified intent-to-treat (mITT) population. Only responders (CR or PR) by investigator assessment were included in this analysis. The participants analyzed in the arm (GSK3845097 0.1 × 10\^9 - 0.8 × 10\^9 cells) is 0, as there were no confirmed response of PR or CR.

ArmMeasureValue (MEAN)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsDuration of Response (DoR)2.53 Months
Secondary

Maximum Transgene Expansion (Cmax) of GSK3845097

Cmax was defined as peak cell expansion during the interventional phase. Blood samples were collected to measure Cmax.

Time frame: Up to 21 days

Population: Pharmacokinetic population included participants from the mITT population for whom at least one persistence sample was obtained, analysed, and was measurable.

ArmMeasureValue (GEOMETRIC_MEAN)Dispersion
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsMaximum Transgene Expansion (Cmax) of GSK384509754606.56 Copies per microgram genomic DNAGeometric Coefficient of Variation 139.944
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsMaximum Transgene Expansion (Cmax) of GSK3845097105446.79 Copies per microgram genomic DNAGeometric Coefficient of Variation 74.752
Secondary

Overall Response Rate (ORR) Assessed by Investigator According to RECIST v1.1

Overall response rate (ORR) 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. Partial response (PR) was defined as at least a 30% decrease in the sum of the diameters of target lesions, taking as reference the baseline sum diameters. Complete response (CR) was defined as the 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). Confidence intervals (CI) were calculated using the exact (Clopper-Pearson) method.

Time frame: Up to approximately 21 months

Population: Modified intent-to-treat (mITT) population.

ArmMeasureValue (NUMBER)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsOverall Response Rate (ORR) Assessed by Investigator According to RECIST v1.150.0 Percentage of participants
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsOverall Response Rate (ORR) Assessed by Investigator According to RECIST v1.10.0 Percentage of participants
Secondary

Time to Cmax (Tmax) of GSK3845097

Tmax was defined as time to peak cell expansion during the interventional phase. Blood samples were collected to measure Tmax.

Time frame: Up to 21 days

Population: Pharmacokinetic population included participants from the mITT population for whom at least one persistence sample was obtained, analyzed, and was measurable.

ArmMeasureValue (MEDIAN)
GSK3845097 1 × 10^9 - 8 × 10^9 Transduced CellsTime to Cmax (Tmax) of GSK384509714.0 Days
GSK3845097 0.1 × 10^9 - 0.8 × 10^9 Transduced CellsTime to Cmax (Tmax) of GSK384509710.5 Days

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026