ET140203 T Cells in Pediatric Subjects With Hepatoblastoma, HCN-NOS, or Hepatocellular Carcinoma

Phase 1

Recruiting

• Conditions: Hepatoblastoma; Liver Neoplasms; Metastatic Liver Cancer; Hepatocellular Carcinoma (HCC); Liver Cancer; HEMNOS
• Interventions: Drug: ET140203 T Cells

• Registration Number: NCT04634357
• Lead Sponsor: Eureka Therapeutics Inc.

Brief Summary

Open-label, dose escalation, multi-center, Phase I/II clinical trial to assess the safety/tolerability and determine the recommended Phase II Dose (RP2D) of ET140203 T-cells in pediatric subjects who are AFP-positive/HLA-A2-positive and have relapsed/refractory HB, HCN-NOS, or HCC.

Detailed Description

The trial starts with a dose escalation phase. A traditional dose escalation model (3+3) design will be used to determine the recommended phase II dose (RP2D). Subjects will then be treated at the RP2D in the expansion phase of the trial.

Following treatment, tumor response assessments will be performed at Months 1, 3, 6, 9, 12, 18, and 24. At each tumor response assessment visit, imaging will be performed (triphasic CT Scan) and used for response evaluation. Serum AFP levels will also be measured at each tumor response assessment visit.

The active assessment phase of the study will continue for 2 years. Subjects will be followed for 15 years post-treatment for assessment of treatment safety and overall survival.

Study Timeline

• Study First Submitted: 2020-11-04
• Study First Submitted QC: 2020-11-12
• Study First Posted: 2020-11-18
• Study Start: 2022-07-19
• Status Verified: 2025-04
• Last Update Submitted: 2025-04-07
• Last Update Posted: 2025-04-09
• Primary Completion: 2026-01-31
• Study Completion: 2028-01-31

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 15

Inclusion Criteria

1. Histologically confirmed HB, HCN-NOS, or HCC with serum AFP >100ng/mL at the time of screening and following the most recent line of therapy.
2. Disease reoccurrence after remission following initial standard-of care (SOC) treatment (i.e., relapse) or failure of response to SOC treatment (i.e., refractory).
3. Age ≥ 1 year and ≤ 21 years.
4. Molecular Human Leukocyte Antigen (HLA) class I allele typing that confirms subject carries at least one HLA-A2 allele.
5. Life expectancy of > 4 months per the Investigator's opinion.
6. Lansky or Karnofsky Performance Scale ≥ 70.
7. For enrollment to the dose-finding cohort, subjects must have at least one (1) lesion ≥ 5 mm in diameter or two (2) or more lesions ≥ 3 mm in diameter. For the dose-expansion cohort, subjects must have measurable disease by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.
8. Child-Pugh score of A6 or better.
9. Adequate organ function.

Exclusion Criteria

1. Recurrent HB who are candidates for complete surgical resection (e.g., isolated pulmonary relapse amendable to pulmonary metastasectomy).
2. Pre-existing illness including heart failure, uncontrolled pulmonary disease not cancer-related, or psychiatric illness/social situation that would limit compliance with study requirements.
3. Active, uncontrolled systemic bacterial, fungal, or viral infection. Subjects with Human Immunodeficiency Virus (HIV), hepatitis B, or hepatitis C are eligible provided their infection is being treated and the viral load is controlled.
4. Any known active malignancy (other than HB, HCN-NOS, or HCC).
5. Pregnant or lactating women.
6. Received the following within two (2) weeks of leukapheresis or within two (2) weeks of conditioning chemotherapy: cytotoxic chemotherapy, radiation, other anti-cancer therapies (including immunotherapeutic agents), immunosuppressive therapy, or systemic corticosteroids at doses greater than 5 mg/day of prednisone or equivalent doses of other corticosteroids. (Note: Topical and inhaled corticosteroids in standard doses and physiological replacement doses of corticosteroids for adrenal insufficiency are allowed).
7. Concurrently receiving other investigational agents, biological, chemical, or radiation therapies, while participating in the study.
8. Contraindication for receipt of conditioning chemotherapeutic agents including Fludarabine and Cyclophosphamide.
9. Active autoimmune disease requiring systemic immunosuppressive therapy.
10. Compromised circulation in the main portal vein, hepatic vein, or vena cava due to partial or complete obstruction which, in the opinion of the Investigator, would make the subject unsuitable for the study.
11. History of organ transplant.
12. HB, HCN-NOS, or HCC involving greater than 50% of the liver (volumetric).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
ET140203 T Cells	ET140203 T Cells	ET140203 Autologous T Cells

Primary Outcome Measures

Name	Time	Method
The recommended phase 2 dose (RP2D) regimen of ET140203 T cell therapy primarily based on DLT	Up to 2 years	The RP2D will be determined by the study Dose Escalation Committee (DEC) and primarily based on DLTs.
Incidence rates of adverse events (AEs) after infusion of ET140203 T cells	28 days	Safety of ET140203 T cells as assessed by the number of adverse events (AEs) after infusion
Severity rates of adverse events (AEs) after infusion of ET140203 T cells	28 days	Safety of ET140203 T cells as assessed by the severity of adverse events (AEs) after infusion.
Incidence rates of dose limiting toxicities (DLTs) after infusion of ET140203 T cells	28 days	Tolerability of ET140203 T cells after infusions assessed by committee review of dose limiting toxicities (DLTs)

Secondary Outcome Measures

Name	Time	Method
Determine the pharmacokinetics of ET140203 T cells after infusion.	Up to 2 years	Assess the expansion and persistence of ET140203 T cells circulating in blood over time.
Assess the efficacy of ET140203 T cells in pediatric subjects with relapsed/refractory HB, HCN-NOS, or HCC	Up to 2 years	Response rate will be assessed by radiographic scans and assessed according to RECIST criteria.

Trial Locations

Locations (2)

Dana-Farber/Boston Children's Cancer and Blood Disorders Center; 🇺🇸 Boston, Massachusetts, United States

UCSF Benioff Children's Hospitals; 🇺🇸 San Francisco, California, United States