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THOR-707

Phase 2

Oesophageal Squamous Cell Carcinoma | Small molecule | Oncology |Sanofi|Trials Updated: Sep 24, 2025

THOR-707 development status

Highest phase Phase 2
Registered trials 6 across 2 sponsors since Jul 2019

THOR-707 target and mechanism

Molecular targetIL-2
Target classCytokine
ModalitySmall molecule

Also known as Pegenzileukin

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment138

FDA Designations

No designations recorded

THOR-707 clinical trials

THOR-707 · 1 trial · 5 indications

Phase 2 1
NCT05104567A Study of SAR444245 Combined With Other Anticancer Therapies for the Treatment of Participants With Gastrointestinal Cancer (Master Protocol) (Pegathor Gastrointestinal 203)Oesophageal Squamous Cell Carcinoma
COMPLETED138 Analytics
PHASE2COMPLETED
A Study of SAR444245 Combined With Other Anticancer Therapies for the Treatment of Participants With Gastrointestinal Cancer (Master Protocol) (Pegathor Gastrointestinal 203)
Oesophageal Squamous Cell CarcinomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Cohort A: Objective Response Rate (ORR)
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 8 months

ORR was defined as the percentage of participants who had a confirmed complete response (CR) or partial response (PR) as per Response Evaluation Criteria in Solid Tumors (RECIST) version (v) 1.1. CR was defined as the disappearance of all target lesions, any pathological lymph nodes (whether target or non-target) with reduction in short axis to \<10 millimeter (mm) (\<1 centimeter \[cm\]). 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.

Cohorts B1, B2 and B3: Objective Response Rate
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 25 months

ORR was defined as the percentage of participants who had a confirmed CR or PR as per RECIST v 1.1. CR was defined as the disappearance of all target lesions, any pathological lymph nodes (whether target or non-target) with reduction in short axis to \<10 mm (\<1 cm). 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.

Cohort C: Objective Response Rate
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 20 months

ORR was defined as the percentage of participants who had a confirmed CR or PR as per RECIST v 1.1. CR was defined as the disappearance of all target lesions, any pathological lymph nodes (whether target or non-target) with reduction in short axis to \<10 mm (\<1 cm). 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.

Cohorts D1 and D2: Objective Response Rate
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 8 months

ORR was defined as the percentage of participants who had a confirmed CR or PR as per RECIST v 1.1. CR was defined as the disappearance of all target lesions, any pathological lymph nodes (whether target or non-target) with reduction in short axis to \<10 mm (\<1 cm). 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.

Secondary Endpoints

All Cohorts: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) and Treatment-Emergent Serious Adverse Events (TESAEs)
From first dose of study treatment administration (Day 1) up to 30 days post last dose of study treatment administration, up to approximately 9 months (Cohorts A, D1 and D2), 26 months (Cohorts B1, B2 and B3) and 21 months (Cohort C)
All Cohorts: Time to Response (TTR)
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 8 months (Cohort A, D1 and D2), 25 months (Cohort B1, B2 and B3), 20 months (Cohort C)
All Cohorts: Duration of Response (DOR)
From first dose of study treatment administration (Day 1) up to maximum exposure of study treatment; approximately 8 months (Cohort A, D1 and D2), 25 months (Cohort B1, B2 and B3), 20 months (Cohort C)
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort A: ESCC Post PD-1/PD-L1; SAR444245 24 mcg/kg + Pembrolizumab as 2/3L TherapyEXPERIMENTALParticipants with advanced unresectable or metastatic esophageal squamous cell carcinoma (ESCC), regardless of programmed cell death-ligand 1 (PD-L1) expression (any combined positive score \[CPS\]), who had received at least 1 but no more than 2 prior lines of treatment and had progressed after primary or secondary resistance to an anti-programmed cell death-1 (PD-1)/PD-L1 based regimen were included in this cohort. Participants received SAR444245 24 microgram per kilogram (mcg/kg) along with pembrolizumab 200 milligram (mg) via intravenous (IV) infusion every 3 weeks (q3w) on Day 1 of each cycle (each cycle is 21 days) (as second-line or third-line \[2/3L\] therapy), until disease progression (PD), unacceptable adverse event (AE) or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort B1: GC/GEJ PD-1/PD-L1 naïve non-MSI-H CPS >=1EXPERIMENTALCohort B1: GC/GEJ PD-1/PD-L1 naïve non-MSI-H CPS \>=1; SAR444245 24mcg/kg+Pembrolizumab as 1-3L Therapy. Participants with advanced unresectable or metastatic gastric cancer (GC) or Siewert Type 2 \& 3 gastro-esophageal junction adenocarcinoma (GEJ) and for whom standard of care (SOC) was not in best interest or where no SOC was established, non-high-level microsatellite instability (MSI-H) disease and had not received more than 2 prior lines of treatment that did not include an anti-PD-1/PD-L1-based regimen with the level of PD-L1 expression at baseline as CPS \>=1 GC/GEJ were included in this cohort. Participants received SAR444245 24 mcg/kg along with pembrolizumab 200 mg via IV infusion q3w on Day 1 of each cycle (each cycle is 21 days) (as first to \[1-\]3L therapy), until PD, unacceptable AE or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort B2: GC/GEJ PD-1/PD-L1 naïve non-MSI-H CPS <1EXPERIMENTALCohort B2: GC/GEJ PD-1/PD-L1 naïve non-MSI-H CPS \<1; SAR444245 24 mcg/kg+Pembrolizumab as 1-3L Therapy. Participants with advanced unresectable or metastatic GC or Siewert Type 2 \& 3 GEJ and for whom SOC was not in best interest or where no SOC was established, non-MSI-H disease and had not received more than 2 prior lines of treatment that did not include an anti-PD-1/PD-L1-based regimen with the level of PD-L1 expression at baseline as CPS \<1 GC/GEJ were included in this cohort. Participants received SAR444245 24 mcg/kg along with pembrolizumab 200 mg via IV infusion q3w on Day 1 of each cycle (each cycle is 21 days) (as 1-3L therapy), until PD, unacceptable AE or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort B3: GC/GEJ Post PD-1/PD-L1 non-MSI-H; SAR444245 24 mcg/kg + Pembrolizumab as 2-4L TherapyEXPERIMENTALParticipants with advanced unresectable or metastatic GC or Siewert Type 2 \& 3 GEJ and for whom SOC was not in best interest or where no SOC was established, non-MSI-H disease and had received atleast 1 and no more than 3 prior lines of treatment and had progressed after primary or secondary resistance to an anti-PD-1/PD-L1-based regimen (regardless of the disease CPS status) were included in this cohort. Participants received SAR444245 24 mcg/kg along with pembrolizumab 200 mg via IV infusion q3w on Day 1 of each cycle (each cycle is 21 days) (as 2-fourth \[4\]L therapy), until PD, unacceptable AE or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort C: HCC Post PD-1/PD-L1; SAR444245 24 mcg/kg + Pembrolizumab as 2/3L TherapyEXPERIMENTALParticipants with advanced unresectable or metastatic hepatocellular carcinoma (HCC), regardless of any CPS, who relapsed on prior PD-1/PD-L1-based regimens, with at least stable disease (SD) as best response and with no more than 2 prior lines of treatment were included in this cohort. Participants received SAR444245 24 mcg/kg along with pembrolizumab 200 mg via IV infusion q3w on Day 1 of each cycle (each cycle is 21 days) (as 2/3L therapy), until PD, unacceptable AE or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort D1: CRC non-MSI-H any RAS; SAR444245 24 mcg/kg + Pembrolizumab as 3-6L TherapyEXPERIMENTALParticipants with advanced unresectable or metastatic colorectal cancer (CRC), regardless of any CPS, non-MSI-H disease, any RAS type, who had progressed on prior regimens having contained fluoropyrimidine, oxaliplatin, irinotecan, with either bevacizumab or cetuximab, and with no more than 5 prior lines of treatments were included in this cohort. Participants received SAR444245 24 mcg/kg along with pembrolizumab 200 mg via IV infusion q3w on Day 1 of each cycle (each cycle is 21 days) (as 3-sixth \[6\]L therapy), until PD, unacceptable AE or other full permanent discontinuation criteria was met or completion of Cycle 35.
Cohort D2: CRC non-MSI-H RAS Wild Type; SAR444245 24 mcg/kg + Cetuximab as 3-6L TherapyEXPERIMENTALParticipants with advanced unresectable or metastatic CRC, regardless of any CPS, non-MSI-H disease, RAS wild type, who had progressed on prior regimens having contained fluoropyrimidine, oxaliplatin, irinotecan, with either bevacizumab or cetuximab, and with no more than 5 prior lines of treatments were included in this cohort. Participants received SAR444245 24 mcg/kg q3w on Day 1 of each cycle along with cetuximab as an initial loading dose of 400 mg/square meter (m\^2) on Cycle 1 Day 1 followed by 250 mg/m\^2 starting via IV infusion once weekly from Cycle 1 Day 8 (each cycle is 21 days) (as 3-6L therapy) until PD.

Interventions

NameTypeDescription
THOR-707DRUGSolution for infusion: intravenous infusion
PembrolizumabDRUGSolution for infusion: intravenous infusion
CetuximabDRUGSolution for infusion: intravenous infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites29

Inclusion Criteria: * Participant must be ≥18 years of age (or country's legal age of majority if \>18 years), at the time of signing the informed consent. * Participants with: * Sub-study01: Histologically or cytologically confirmed diagnosis of advanced unresectable or metastatic esophageal ca...

Countries:United StatesBelgiumChileChinaFranceItalyNetherlandsSouth KoreaSpain
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Frequently asked questions about THOR-707

What is THOR-707?

THOR-707 is an investigational small molecule developed by Sanofi for the treatment of oesophageal squamous cell carcinoma and other gastrointestinal cancers. It is designed to act on the IL-2 cytokine pathway. It is currently in Phase 2 clinical development and has not been approved by the FDA.

What is THOR-707 used for in oesophageal squamous cell carcinoma?

THOR-707 is being studied for the treatment of oesophageal squamous cell carcinoma, a cancer of the esophagus. It has also been evaluated in gastric cancer, hepatocellular carcinoma, colorectal cancer, and oesophageal adenocarcinoma. It remains investigational and is not approved for any indication.

What does THOR-707 target?

THOR-707 targets IL-2, a cytokine that regulates immune cell activity. By acting on the IL-2 pathway, the drug is intended to stimulate an anti-tumor immune response. IL-2 belongs to the cytokine class of molecular targets.

Who makes THOR-707?

THOR-707 is developed by Sanofi, which trades on the New York Stock Exchange under the ticker SNY. Sanofi is the sponsor of the clinical program evaluating the drug in gastrointestinal cancers.

What phase is THOR-707 in?

THOR-707 is in Phase 2 clinical development. It is an investigational agent and has not received FDA approval. The Phase 2 program has been conducted in patients with gastrointestinal cancers, including oesophageal squamous cell carcinoma.

What clinical trials is THOR-707 in?

THOR-707 has been evaluated in the Phase 2 trial NCT05104567, titled Pegathor Gastrointestinal 203. The study enrolled 138 participants across the United States, Belgium, Chile, China, France, Italy, Netherlands, South Korea, and Spain. It is listed as completed and studied the drug in combination with other anticancer therapies.