A Phase 1 First-in-Human Study of CRPA1A2, a MAGE-A1/HLA-A*02:01 Bispecific T-Cell Engager, in Patients With Solid Tumors

A Phase I First-In-Human Clinical Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Preliminary Anti-tumor Activity of CRPA1A2, a Bispecific T Cell Engager, in Patients With HLA-A*02:01 and MAGE-A1 Positive Advanced Solid Tumors

This is a Phase I, first-in-human, open-label study of CRPA1A2, a bispecific T-cell engager, in participants with HLA-A*02:01-positive and MAGE-A1-positive advanced solid tumors. The study is designed to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary anti-tumor activity of CRPA1A2, and to identify recommended dose(s) for further evaluation.

The study consists of 2 parts: a dose escalation part (Part A) and a dose optimization part (Part B). In Part A, participants will receive escalating doses of CRPA1A2 to determine the recommended dose(s) for optimization, with additional backfill cohorts permitted. In Part B, 2 to 3 selected recommended dose(s) will be further evaluated in participants with selected tumor types to better characterize safety and preliminary anti-tumor activity.

CRPA1A2 will be administered by intravenous infusion in 28-day cycles, starting at 0.0003 mg/kg. Weekly dosing is planned, although alternative dosing schedules may be explored based on emerging data. Treatment will continue until disease progression, intolerable toxicity, initiation of new anti-tumor therapy, other discontinuation criteria are met, or study termination.

Study Overview

• Status: Not yet recruiting
• Conditions: Head and Neck Cancer; Hepatocellular Carcinoma (HCC); Esophagus Cancer; Lung Cancer (Locally Advanced or Metastatic)
• Intervention / Treatment: Drug: CRPA1A2

• Study Type: Interventional
• Enrollment (Estimated): 192
• Phase: Phase 1

Contacts and Locations

Study Locations

• China
  • Beijing Municipality
    • Beijing, Beijing Municipality, China, 100142
      • Beijing Cancer hospital
      • Contact: Lin Shen; Phone Number: 010-881965671; Email: doctorshenlin@sina.cn

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Patients with a histological and/or cytological confirmed locally advanced or metastatic unresectable solid tumor (including but not limited to esophageal squamous cell carcinoma, hepatocellular carcinoma, head and neck squamous cell carcinoma and lung squamous cell carcinoma) who have experienced disease progression following available standard therapy and for whom no further standard treatment options are available.
2. Patients with confirmed positive expression of MAGE-A1 (H-score ≥1, testing by IHC for FFPE) by central lab.
3. Patients with positive HLA-A*02:01 (confirmed by the central lab).
4. There must be at least one measurable lesion per RECIST v1.1 criteria. (Lesions that have received radiotherapy previously cannot be considered target lesions unless there is evident progression after radiotherapy).
5. Eastern Cooperative Oncology Group (ECOG) performance status: 0-1.
6. Life expectancy ≥ 3 months, in the opinion of the investigator.
7. Has adequate organ function, as demonstrated by laboratory values obtained during the screening period.
8. Participants (both males and females) of childbearing potential must agree to use highly efficient contraception from the time of signing the informed consent form until 6 months after the last dose of the investigational drug.

Exclusion Criteria:

1. Patients with history of other malignancies (within 2 years prior to signing the ICF) are excluded, except for those with cured stage IB or earlier stage cervical cancer, non-invasive basal cell or squamous cell skin cancer, malignant melanoma in complete remission (CR) for over 10 years, or other malignancies in complete remission (CR) for over 5 years.
2. Patients with positive HLA-A*02:05 (confirmed by the central lab).
3. Patients with known sensitivity or immediate hypersensitivity to any components of CRPA1A2 or ingredients of CRPA1A2 injection.
4. Patients who have been exposed to other MAGE-A1 targeted therapy.

5. With clinically significant cardiovascular diseases, including but not limited to:

   1. History of heart failure, myocardial ischemia or infarction, unstable angina, arrhythmias, or New York Heart Association (NYHA) Class III-IV within the past 6 months or currently.
   2. With prolonged QT/QTc intervals on the electrocardiogram during the screening period (QTcF: > 480 ms).
   3. Echocardiogram (ECHO) indicates a left ventricular ejection fraction (LVEF) of ≤50% at screening.
   4. Poorly controlled hypertension at screening (systolic blood pressure ≥150 mmHg, diastolic blood pressure ≥100 mmHg) despite pharmacological treatment.
   5. History of vascular angioplasty, coronary artery bypass grafting, or other cardiac surgical procedures.
6. With clinically significant active hepatitis B, HBsAg or HBcAb positive and have an HBV-DNA level above the detection limit at screening (i.e., the upper limit of normal values at each research center's laboratory). With the exception for those that have achieved HBV-DNA negativity after antiviral treatment and have received at least 2 weeks of antiviral therapy before the initial dosing. Additionally, they must be willing to continue antiviral therapy for hepatitis B throughout the study period. For patients with hepatocellular carcinoma, HBV DNA must be <1000 IU/mL for study eligibility.
7. Clinically significant active hepatitis C, indicated by positive HCV antibodies and HCV-RNA levels higher than the detection limit at screening (upper limit of normal values).
8. Positive Treponema pallidum antibodies (TP-Ab) and positive result for nonspecific syphilis antibodies titer (RPR) at screening.
9. Prior or concurrent therapies/procedures that may confound study evaluation or increase risk, including recent participation in another clinical study; recent anticancer therapy, investigational treatment, or invasive investigational medical device use; major surgery without full recovery; prior solid organ transplantation or allogeneic hematopoietic stem cell transplantation; recent autologous hematopoietic stem cell transplantation; or planned transplantation during the study period.
10. Active, uncontrolled, or clinically significant medical conditions that may increase the risk of study participation or interfere with study assessments, including severe infection; symptomatic or uncontrolled central nervous system or leptomeningeal metastases; clinically significant pulmonary disease (e.g., interstitial lung disease/pneumonitis); coagulation or bleeding disorders; autoimmune disease or immunodeficiency (including HIV infection); or significant neurologic or psychiatric disorders.
11. Unresolved toxicities or other conditions considered by the investigator to make the participant unsuitable for the study, including failure to recover adequately from prior anticancer treatment-related toxicities, prior Grade ≥2 ICANS after T-cell engager or CAR-T therapy, clinically significant abnormal laboratory findings, or other severe/uncontrolled acute or chronic diseases, alcohol abuse, or substance misuse.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Part A Dose Escalation; Participants will receive CRPA1A2 by intravenous infusion in 28-day cycles in the dose-escalation part of the study. Treatment will start at 0.0003 mg/kg and proceed through protocol-defined escalating dose levels using a standard dosing approach and/or a step-up dosing strategy, as applicable. This arm is designed to evaluate safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and preliminary anti-tumor activity and to support identification of the recommended dose(s) for optimization (RDO[s]).	Drug: CRPA1A2; CRPA1A2 is an investigational bispecific T-cell engager administered by intravenous infusion in 28-day cycles. In Part A, treatment will start at 0.0003 mg/kg and proceed according to protocol-defined escalating dose levels. Weekly dosing is planned, although alternative dosing schedules may be explored during Part A based on emerging PK/PD, safety, tolerability, and efficacy data. A standard dosing approach and/or a step-up dosing strategy may be used. In Part B, participants will receive protocol-defined selected recommended dose(s) for optimization. Treatment will continue until disease progression, intolerable toxicity, initiation of new anti-tumor therapy, fulfillment of other protocol-defined discontinuation criteria, or study termination, whichever occurs first.
Experimental: Part B RDO 1; Participants with selected tumor types will be randomized in Part B to receive CRPA1A2 at Recommended Dose for Optimization 1 (RDO 1), administered by intravenous infusion in 28-day cycles according to the protocol-defined regimen, to further characterize safety and preliminary anti-tumor activity.	Drug: CRPA1A2; CRPA1A2 is an investigational bispecific T-cell engager administered by intravenous infusion in 28-day cycles. In Part A, treatment will start at 0.0003 mg/kg and proceed according to protocol-defined escalating dose levels. Weekly dosing is planned, although alternative dosing schedules may be explored during Part A based on emerging PK/PD, safety, tolerability, and efficacy data. A standard dosing approach and/or a step-up dosing strategy may be used. In Part B, participants will receive protocol-defined selected recommended dose(s) for optimization. Treatment will continue until disease progression, intolerable toxicity, initiation of new anti-tumor therapy, fulfillment of other protocol-defined discontinuation criteria, or study termination, whichever occurs first.
Experimental: Part B RDO 2; Participants with selected tumor types will be randomized in Part B to receive CRPA1A2 at Recommended Dose for Optimization 2 (RDO 2), administered by intravenous infusion in 28-day cycles according to the protocol-defined regimen, to further characterize safety and preliminary anti-tumor activity.	Drug: CRPA1A2; CRPA1A2 is an investigational bispecific T-cell engager administered by intravenous infusion in 28-day cycles. In Part A, treatment will start at 0.0003 mg/kg and proceed according to protocol-defined escalating dose levels. Weekly dosing is planned, although alternative dosing schedules may be explored during Part A based on emerging PK/PD, safety, tolerability, and efficacy data. A standard dosing approach and/or a step-up dosing strategy may be used. In Part B, participants will receive protocol-defined selected recommended dose(s) for optimization. Treatment will continue until disease progression, intolerable toxicity, initiation of new anti-tumor therapy, fulfillment of other protocol-defined discontinuation criteria, or study termination, whichever occurs first.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of dose-limiting toxicities (DLTs) in Part A	Frequency and type of dose-limiting toxicities (DLTs) during the protocol-defined DLT evaluation period in the dose-escalation phase (Part A).	Day 28
Incidence of treatment-emergent adverse events (TEAEs), treatment-related adverse events (TRAEs), and clinically significant changes in safety tests	Frequency and type of treatment-emergent adverse events, treatment-related adverse events, and clinically significant changes in protocol-specified safety tests in Parts A and B.	up tp 30 months
Maximum tolerated dose (MTD) and/or recommended dose(s) for optimization (RDO[s]) and dosing schedule in Part A	Identification of the maximum tolerated dose and/or recommended dose(s) for optimization and dosing schedule of CRPA1A2 based on an integrated assessment of safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary anti-tumor activity in the dose-escalation phase (Part A).	Day 1, Day 8, Day 15, Day 28
Objective response rate (ORR) per RECIST v1.1 in Part B	Proportion of participants with a best overall response of complete response or partial response according to RECIST v1.1 in the dose-optimization phase (Part B).	up to 30 months
Duration of response (DoR) per RECIST v1.1 in Part B	Time from the first documented objective response to the first documented disease progression or death, whichever occurs first, according to RECIST v1.1 in the dose-optimization phase (Part B).	up to 30 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Peak Plasma concentration (Cmax) of CRPA1A2	Peak Plasma concentration (Cmax) of CRPA1A2 in Parts A and B.	Day 1, Day 3, Day 5, Day 8,Day15, Day 22
Area under the plasma concentration versus time curve (AUC) of CRPA1A2	Area under the plasma concentration versus time curve (AUC) of CRPA1A2 in Part A and Part B	Day 1, Day 3, Day 5, Day 8, Day 15, Day 22
Disease control rate (DCR) and progression-free survival (PFS) per RECIST v1.1 in Part A and Part B.	Preliminary anti-tumor activity of CRPA1A2 assessed by DCR and PFS according to RECIST v1.1.	up tp 30 months
Objective response rate (ORR) and duration of response (DoR) per RECIST v1.1 in Part A.	Preliminary anti-tumor activity of CRPA1A2 assessed by ORR and DoR according to RECIST v1.1 in the dose-escalation phase (Part A).	up to 30 months
Objective response rate (ORR), duration of response (DoR), disease control rate (DCR), and progression-free survival (PFS) per iRECIST	Preliminary anti-tumor activity of CRPA1A2 assessed by ORR, DoR, DCR, and PFS according to iRECIST.	up to 30 months
Overall survival (OS)	Time from first dose to death from any cause in Parts A and B.	up to 30 months

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Immunogenicity	Incidence of detectable anti-CRPA1A2 antibodies	up to 30 months

Collaborators and Investigators

• Sponsor: Corregene Biotechnology Co., Ltd

Study record dates

Study Major Dates

• Study Start (Estimated): May 29, 2026
• Primary Completion (Estimated): March 30, 2030
• Study Completion (Estimated): September 30, 2030

Study Registration Dates

• First Submitted: April 22, 2026
• First Submitted That Met QC Criteria: May 6, 2026
• First Posted (Actual): May 13, 2026

Study Record Updates

• Last Update Posted (Actual): May 13, 2026
• Last Update Submitted That Met QC Criteria: May 6, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: Advanced solid tumors; MAGE-A1; HLA-A*02:01; CRPA1A2; Bispecific T-cell engager
• Additional Relevant MeSH Terms: Pathologic Processes; Neoplasms by Site; Neoplasms; Respiratory Tract Diseases; Neoplasms by Histologic Type; Gastrointestinal Neoplasms; Digestive System Neoplasms; Digestive System Diseases; Gastrointestinal Diseases; Lung Diseases; Liver Diseases; Neoplasms, Glandular and Epithelial; Adenocarcinoma; Liver Neoplasms; Respiratory Tract Neoplasms; Thoracic Neoplasms; Neoplastic Processes; Esophageal Diseases; Carcinoma; Pathological Conditions, Signs and Symptoms; Carcinoma, Hepatocellular; Lung Neoplasms; Esophageal Neoplasms; Neoplasm Metastasis; Head and Neck Neoplasms
• Other Study ID Numbers: CRPA1A2-101

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: No individual participant data are planned to be shared at this time.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No