HF50 in HER-2 Positive and Low-expression Advanced Solid Tumors

NCT ID: NCT06822998

Last Updated: 2025-08-17

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: EARLY_PHASE1
• Total Enrollment: 10 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-06-11
• Study Completion Date: 2026-06-01

Brief Summary

This is an open-label, single-arm, non-randomized, single-center, dose-escalation study designed to evaluate the safety and tolerability of HF50 in patients with HER-2 positive and HER-2 low-expression advanced solid tumors. The primary objectives are to assess the safety, tolerability, and determine the maximum tolerated dose (MTD) and/or recommended Phase II dose (RP2D) of HF50. Secondary objectives include evaluating the pharmacokinetic (PK) profile and preliminary antitumor activity of HF50.

Conditions

Advanced Solid Tumors

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Dose Level 1 - 1 mg

Participants in this arm will receive HF50 via intravenous infusion once weekly for 3 weeks in a 3-week treatment cycle. The dose is 1 mg, with a lead-in dose on Cycle 1 Day 1 (C1D1) followed by the target dose on C1D8, C1D15, and C1D22.

Group Type: EXPERIMENTAL

HF50

Intervention Type: DRUG

HF50 is a liposomal T-cell engager with an unique design based on the lipid bilayer. It was also named a T cell Redirecting Antibody Fragment-anchored Liposomes (TRAFsome). The liposomal surface carries anti-CD3ε and anti-HER2 antibody-conjugated lipid molecules, enabling T-cell redirection and activation at HER2-positive or HER2-low tumor sites. In addition, the liposome internal space contains a TLR7/8 agonist Resiquimod (R848), which has been shown to help modulate the myeloid cells in the tumor micro-environement to complement the immune activation effects.

Dose Level 2 - 10 mg

Participants in this arm will receive HF50 via intravenous infusion once weekly for 3 weeks in a 3-week treatment cycle. The dose is 10 mg, with a lead-in dose on C1D1 followed by the target dose on C1D8, C1D15, and C1D22.

Group Type: EXPERIMENTAL

HF50

Intervention Type: DRUG

HF50 is a liposomal T-cell engager with an unique design based on the lipid bilayer. It was also named a T cell Redirecting Antibody Fragment-anchored Liposomes (TRAFsome). The liposomal surface carries anti-CD3ε and anti-HER2 antibody-conjugated lipid molecules, enabling T-cell redirection and activation at HER2-positive or HER2-low tumor sites. In addition, the liposome internal space contains a TLR7/8 agonist Resiquimod (R848), which has been shown to help modulate the myeloid cells in the tumor micro-environement to complement the immune activation effects.

Dose Level 3 - 60 mg

Participants in this arm will receive HF50 via intravenous infusion once weekly for 3 weeks in a 3-week treatment cycle. The dose is 60 mg, with a lead-in dose on C1D1 followed by the target dose on C1D8, C1D15, and C1D22.

Group Type: EXPERIMENTAL

HF50

Intervention Type: DRUG

HF50 is a liposomal T-cell engager with an unique design based on the lipid bilayer. It was also named a T cell Redirecting Antibody Fragment-anchored Liposomes (TRAFsome). The liposomal surface carries anti-CD3ε and anti-HER2 antibody-conjugated lipid molecules, enabling T-cell redirection and activation at HER2-positive or HER2-low tumor sites. In addition, the liposome internal space contains a TLR7/8 agonist Resiquimod (R848), which has been shown to help modulate the myeloid cells in the tumor micro-environement to complement the immune activation effects.

Dose Level 4 - 240 mg

Participants in this arm will receive HF50 via intravenous infusion once weekly for 3 weeks in a 3-week treatment cycle. The dose is 240 mg, with a lead-in dose on C1D1 followed by the target dose on C1D8, C1D15, and C1D22.

Group Type: EXPERIMENTAL

HF50

Intervention Type: DRUG

HF50 is a liposomal T-cell engager with an unique design based on the lipid bilayer. It was also named a T cell Redirecting Antibody Fragment-anchored Liposomes (TRAFsome). The liposomal surface carries anti-CD3ε and anti-HER2 antibody-conjugated lipid molecules, enabling T-cell redirection and activation at HER2-positive or HER2-low tumor sites. In addition, the liposome internal space contains a TLR7/8 agonist Resiquimod (R848), which has been shown to help modulate the myeloid cells in the tumor micro-environement to complement the immune activation effects.

Interventions

HF50

HF50 is a liposomal T-cell engager with an unique design based on the lipid bilayer. It was also named a T cell Redirecting Antibody Fragment-anchored Liposomes (TRAFsome). The liposomal surface carries anti-CD3ε and anti-HER2 antibody-conjugated lipid molecules, enabling T-cell redirection and activation at HER2-positive or HER2-low tumor sites. In addition, the liposome internal space contains a TLR7/8 agonist Resiquimod (R848), which has been shown to help modulate the myeloid cells in the tumor micro-environement to complement the immune activation effects.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Participants must voluntarily provide written informed consent (ICF) prior to any study-related procedures, and be capable of complying with all protocol requirements.
• Adult participants aged between 18 and 75 years (inclusive) at the time of ICF signing.
• Histologically or cytologically confirmed advanced HER-2 positive or HER-2 low-expression solid tumors that are unresectable, metastatic, or have relapsed after standard therapies, are intolerant to standard therapies (e.g., chemotherapy, targeted therapy), or lack effective treatment options.
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• Life expectancy of at least 3 months.
• At least one measurable lesion as defined by RECIST version 1.1.
• Adequate organ and bone marrow function as demonstrated by the following laboratory parameters:Hematologic Function:Absolute neutrophil count (ANC) ≥1.5×10⁹/L、Lymphocyte count ≥1.0×10⁹/L、Platelet count ≥90×10⁹/L、Hemoglobin ≥9.0 g/dL (without transfusion or erythropoietin-stimulating agents within 14 days)； Coagulation Parameters:Activated partial thromboplastin time (aPTT) ≤1.5×ULN、 International normalized ratio (INR) ≤1.5. Hepatic Function:Total bilirubin (TBIL) ≤1.5×ULN、Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤2.5×ULN (≤5×ULN for participants with liver metastases, and TBIL ≤3×ULN)； Renal Function:Creatinine clearance (CrCl) ≥50 mL/min (Cockcroft-Gault formula).
• Female participants of childbearing potential must have a negative serum pregnancy test at screening and prior to the first dose. Male and female participants of childbearing potential must agree to use effective contraception during the study and for 6 months after the last dose.

Exclusion Criteria

• History of active autoimmune disease or autoimmune disease considered unsuitable for study participation, with exceptions for localized skin conditions (e.g., eczema involving <10% of body surface area, vitiligo, psoriasis, alopecia) or childhood asthma resolved without treatment in adulthood.
• Current use of immunosuppressants or systemic corticosteroids (>10 mg/day prednisone or equivalent) within 4 weeks prior to the first dose, except for local steroid use.
• Receipt of systemic chemotherapy, radiotherapy, targeted therapy, or immunotherapy less than 2 weeks (or 4 weeks for nitrosourea or mitomycin C) or within 5 half-lives of the prior therapy before the first dose.
• Symptomatic brain metastases or leptomeningeal disease unless adequately treated (e.g., surgery or radiotherapy) with no evidence of progression for ≥28 days and off systemic steroids for ≥14 days prior to the first dose.
• Unresolved toxicities from prior therapies ≥Grade 2 (CTCAE v5.0) at baseline, except for toxicities deemed by the investigator to pose no safety risk (e.g., alopecia, stable hypothyroidism with hormone replacement).
• Significant cardiovascular or cerebrovascular conditions, including but not limited to:Thromboembolic events requiring therapeutic anticoagulation within 3 months prior to the first dose.NYHA Class III or IV heart failure.Acute coronary syndrome, congestive heart failure, aortic dissection, or stroke within 6 months prior to the first dose.Uncontrolled hypertension (systolic blood pressure >160 mmHg or diastolic blood pressure >100 mmHg), unless controlled with antihypertensive medication.
• Active infection or unexplained fever >38.5°C within 1 week prior to the first dose (tumor-related fever may be eligible at the investigator's discretion).
• Known HIV infection, active hepatitis B virus (HBV) infection (HBV DNA >ULN), or active hepatitis C virus (HCV) infection (HCV RNA >ULN).
• Gastrointestinal symptoms or other conditions requiring intervention within 4 weeks prior to the first dose that would, in the investigator's judgment, impair study participation.
• Pregnant or breastfeeding women.
• Any other severe systemic disease, psychological condition, or significant clinical abnormality deemed unsuitable for study participation by the investigator.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 75 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

HighField Biopharmaceuticals Corporation

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Lei Liu, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

West China Hospital

Locations

West China Hospital of Sichuan University

Chengdu, Sichuan, China

Site Status: RECRUITING

Countries

China

Central Contacts

Zelei Dai, MMedSc

Role: CONTACT

daisydzl@icloud.com

+86 17691161216

Facility Contacts

Zelei Dai

Role: primary

daisydzl@163.com

+86 176 9116 1216

Other Identifiers

HF50-101

Identifier Type: -

Identifier Source: org_study_id