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Solid Tumor CancerPhase 1/2NCT06848699

A Phase Ib/II Clinical Study to Evaluate HLX43 in Combination With Serplulimab in Patients With Advanced/Metastatic Solid Tumors

A Phase 1/2 study testing HLX43 dose 1, HLX43 dose 2 and HLX43 dose 3 in people with Solid Tumor Cancer and Non Small Cell Lung Cancer, run by Shanghai Henlius Biotech at 3 sites in China.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

The study is being conducted to explore the reasonable dosage and evaluate the efficacy, safety and tolerability of HLX43 (Anti-PD-L1 ADC) in combination with Serplulimab (anti-PD-1 humanized monoclonal antibody injection) in patients with advanced/metastatic solid tumors Read more about this study

Who is it for?
Ages 18 to 75 years
What is being tested?
HLX43 dose 1, HLX43 dose 2 and HLX43 dose 3
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
105 participants
Where
3 sitesChina
Study dates
25 Feb 2025to 1 Oct 2027
Phase
Phase 1/2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 75 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Voluntarily participate in the clinical trial; fully understand and be informed about this study and sign the Informed Consent Form (ICF); be willing and able to comply with and complete all trial procedures;
  • Age at the time of signing the ICF is ≥ 18 years and ≤ 75 years;
  • Phase Ib enrollment of patients with histologically or cytologically confirmed advanced /metastatic solid tumor who have experienced treatment failure or for whom no standard treatment is available;Phase II enrollment includes advanced /metastatic NSCLC subjects confirmed by histology or cytology, requiring the presence of EGFR mutation and failure or intolerance to EGFR-TKI or/and platinum-based chemotherapy.
  • Within 4 weeks prior to the first dose, at least one measurable lesion assessed by the investigator according to RECIST 1.1;
  • Subjects must provide qualified tumor tissue samples for the determination of PD-L1 expression levels.
  • The ECOG PS score within 7 days prior to the first use of the Investigational Product is 0 or 1;
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  • Expected survival ≥ 12 weeks;
  • Major organ functions are normal, meeting the following criteria (within 14 days prior to the first administration in this study, no transfusion, albumin, recombinant human thrombopoietin, or colony-stimulating factor (CSF) treatment was received):
  • Female subjects of childbearing potential must meet the following criteria:
  • a)The blood pregnancy test must be negative within 7 days prior to the first administration of the medication; b)Agree to use at least one highly effective method of contraception during the trial period and for at least 6 months after the last administration of the drug;c)Breastfeeding is contraindicated.
  • Male subjects must meet the following criteria: agree to use at least one highly effective method of contraception during the trial and for at least 6 months after the last dose.

Who cannot join

  • History of any second malignancy within 3 years prior to randomization, except for early-stage malignancies (carcinoma in situ or stage I tumors) that have received radical treatment, such as non-melanoma skin cancer, cervical carcinoma in situ, localized prostate cancer, ductal carcinoma in situ of the breast, and papillary thyroid carcinoma.
  • Previously experienced ≥ Grade 3 immune-related Adverse Events during immunotherapy.
  • Pleural effusion or pericardial effusion, or ascites requiring clinical intervention as determined by the investigator;
  • Subjects with clinical symptoms of brain metastases, spinal cord compression, meningitis carcinomatosa, or other evidence indicating that brain or spinal cord metastatic lesions are not yet controlled; Note: Subjects with asymptomatic or stable brain metastases, spinal cord compression, or meningitis carcinomatosa as determined by theinvestigator may be eligible for enrollment;
  • Subjects with a history or current condition of interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-related pneumonia, or severe impairment of pulmonary function, as determined by the sub investigator, that may interfere with the detection and management of suspected drug-related pulmonary toxicity;
  • The subject has poorly controlled cardiovascular and cerebrovascular clinical symptoms or diseases, including but not limited to: (1) NYHA class II or higher heart failure or left ventricular ejection fraction (LVEF) <50%; (2) unstable angina; (3) myocardial infarction or cerebrovascular accident within the past 6 months (excluding lacunar infarction, minor cerebral ischaemia, or transient ischaemic attack); (4) uncontrolled arrhythmia (including QTc interval ≥450 ms for males and ≥470 ms for females, with QTc interval calculated using the Fridericia formula); (5) poorly controlled hypertension (systolic blood pressure >150 mmHg and/or diastolic blood pressure >100 mmHg despite active treatment);
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  • History of immunodeficiency diseases, including testing positive for human immunodeficiency virus (HIV), or having other acquired or congenital immunodeficiency diseases, or a history of organ transplant;
  • Has active pulmonary tuberculosis;
  • Subjests with active HBV, HCV infection or co-infection;
  • There is a known active or suspected autoimmune disease. Enrollment is allowed for subjects in a stable condition who do not require systemic immunosuppressive therapy.
  • Subjects requiring systemic corticosteroids (>10 mg/day prednisone therapeutic dosage) or other immunosuppressive drug therapy within 14 days prior to the first administration of the Investigational Product or during the study. However, the following situations allow for enrollment: in the absence of active autoimmune disorders, the use of topical external application or inhaled steroids and adrenal hormone replacement therapy at a dosage ≤10 mg/day prednisone therapeutic dosage is permitted; prophylactic medication is allowed.
  • Any active infection requiring systemic anti-infective therapy within 14 days prior to the first administration of the Investigational Product;
  • Within 28 days prior to the first administration of the Investigational Product, the subject has undergone major surgery. In this study, major surgery is defined as a procedure requiring at least 3 weeks of postoperative recovery before being eligible to receive treatment in this study. Tumor paracentesis or lymph node incisional biopsy is permitted for enrollment.
  • Strong inhibitors or strong inducers of CYP2D6 or CYP3A were used within 2 weeks prior to the first administration of the drug.
  • Received live viral vaccine treatment within 28 days prior to the first administration of the Investigational Product; however, inactivated viral vaccines for seasonal flu and novel coronavirus are permitted;
  • Participating in another clinical trial or planning to start this study with less than 14 days since the end-of-therapy of the previous clinical trial; less than 5 half-lives since the last course of anti-tumor therapy;
  • Known to have a severe allergy to any monoclonal antibody;
  • Subjects who are not suitable for participating in this clinical study due to any clinical or laboratory abnormalities or other reasons as assessed by the investigator.

Trial locations and contacts

3 sites in 1 country. Contact the study team or a site near you to ask about taking part.

China3 sites, 3 recruiting
  • Second Affiliated Hospital of Army Medical University, PLA

    Chongqing, 400000

    Bo Zhu, Dr

    Recruiting
  • Hunan Provincial Cancer Hospital

    Hunan, Changsha, 410031

    Lin Wu, Dr, 0731-89766300, wulin-calf@vip.163.com

    Lin Wu, Dr

    Recruiting
  • Shandong Cancer Hospital

    Jinan, Shangdong

    Recruiting

Other trials in China

About this study

Official title: A Phase Ib/ II Clinical Study to Evaluate the Safety ,Torlerbility , and Efficacy of HLX43 (Anti-PD-L1 ADC) in Combination With Serplulimab (Anti-PD-1 Humanized Monocl ) in Patients With Advanced/Metastatic Solid Tumors

The study is being conducted to explore the reasonable dosage and evaluate the efficacy, safety and tolerability of HLX43 (Anti-PD-L1 ADC) in combination with Serplulimab (anti-PD-1 humanized monoclonal antibody injection) in patients with advanced/metastatic solid tumors

Read the detailed description

This study is an open-label phase Ib/II clinical study to explore the reasonable dosage and evaluate the efficacy, safety and tolerability of HLX43 (Anti-PD-L1 ADC) in combination with Serplulimab (anti-PD-1 humanized monoclonal antibody injection) in Patients with advanced/metastatic solid tumors. The study is divided into two phases: phase Ib dose escalation and phase II dose expansion.The subjects will receive different dosages of HLX43 combined with a fixed dosage (300 mg) of serplulimab, administered via intravenous infusion every 3 weeks (Q3W) .

Being tested
HLX43 dose 1, HLX43 dose 2, HLX43 dose 3, HLX43 dose 4, HLX43 dose 5
Keywords
HLX43
Medical subject headings
Carcinoma, Non-Small-Cell Lung

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • HLX43 dose 1Drug

    HLX43 is an anti-PD-L1 monoclonal antibody conjugated with a novel high potency DNA topoisomerase I (topo I) inhibitor, with a drug-antibody-ratio (DAR) of 8.

  • HLX43 dose 2Drug

    HLX43 is an anti-PD-L1 monoclonal antibody conjugated with a novel high potency DNA topoisomerase I (topo I) inhibitor, with a drug-antibody-ratio (DAR) of 8.

  • HLX43 dose 3Drug

    HLX43 is an anti-PD-L1 monoclonal antibody conjugated with a novel high potency DNA topoisomerase I (topo I) inhibitor, with a drug-antibody-ratio (DAR) of 8.

  • HLX43 dose 4Drug

    HLX43 is an anti-PD-L1 monoclonal antibody conjugated with a novel high potency DNA topoisomerase I (topo I) inhibitor, with a drug-antibody-ratio (DAR) of 8.

  • HLX43 dose 5Drug

    HLX43 is an anti-PD-L1 monoclonal antibody conjugated with a novel high potency DNA topoisomerase I (topo I) inhibitor, with a drug-antibody-ratio (DAR) of 8.

  • SerplulimabDrug

    anti-PD-1 humanized monoclonal antibody injection

Study groups in NCT06848699
Study groupRoleWhat they receive
HLX43 dose 1ExperimentalPatients with good tolerability and well controlled disease will receive the treatment once every 3 weeks (Q3W), Until disease progression, initiation of a new anti-tumor therapy, death, emergence of intolerable toxicity, or withdrawal of informed consent (whichever occurs first)
Receives: Drug: HLX43 dose 1; Drug: Serplulimab
HLX43 dose 2Experimental: Patients with good tolerability and well controlled disease will receive the treatment once every 3 weeks (Q3W), Until disease progression, initiation of a new anti-tumor therapy, death, emergence of intolerable toxicity, or withdrawal of informed consent (whichever occurs first)
Receives: Drug: HLX43 dose 2; Drug: Serplulimab
HLX43 dose 3Experimental: Patients with good tolerability and well controlled disease will receive the treatment once every 3 weeks (Q3W), Until disease progression, initiation of a new anti-tumor therapy, death, emergence of intolerable toxicity, or withdrawal of informed consent (whichever occurs first)
Receives: Drug: HLX43 dose 3; Drug: Serplulimab
HLX43 dose 4Experimental: Patients with good tolerability and well controlled disease will receive the treatment once every 3 weeks (Q3W), Until disease progression, initiation of a new anti-tumor therapy, death, emergence of intolerable toxicity, or withdrawal of informed consent (whichever occurs first)
Receives: Drug: HLX43 dose 4; Drug: Serplulimab
HLX43 dose 5ExperimentalPatients with good tolerability and well controlled disease will receive the treatment once every 3 weeks (Q3W), Until disease progression, initiation of a new anti-tumor therapy, death, emergence of intolerable toxicity, or withdrawal of informed consent (whichever occurs first)
Receives: Drug: HLX43 dose 5; Drug: Serplulimab

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. DLT

    The proportion of subjects experiencing dose-limiting toxicity (DLT) events in each dosage group during the DLT observation period

    Measured: 21 days after the first dose

  2. MTD

    The maximum tolerated dose of HLX43 incombination with serplulimab

    Measured: through study completion, an average of 12 months

  3. ORR

    Objective response rate (ORR) (assessed by the IRRC according to the RECIST v1.1 criteria)

    Measured: up to 24 weeks

Secondary outcomes (6)
  1. Incidence and severity of adverse events (AEs)

    severity determined according to National Cancer Institute Common Terminology Criteria for Adverse Events [NCI CTCAE] Version [v] 5.0

    Measured: from the date of the first dose to to 90 days after the last dose or the initiation of another anticancer treatment (whichever occurs first).

  2. RP2/3D

    RP2/3D of HLX43 combined with serplulimab in NSCLC patients

    Measured: through study completion, an average of 12 months

  3. PFS

    Defined as the time (in months) from randomization to the first confirmed and documented progressive disease or death (whichever occurs first) as assessed by the IRRC according to the RECIST v1.1 criteria.

    Measured: From date of randomization until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 15 months

  4. PFS

    Defined as the time (in months) from randomization to the first confirmed and documented progressive disease or death (whichever occurs first) as assessed by INV according to the RECIST v1.1 criteria.

    Measured: From date of randomization until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 15 months

  5. ORR

    Objective response rate (ORR) (assessed by INV according to the RECIST v1.1 criteria)

    Measured: up to 24 week

  6. OS

    Overall Survival

    Measured: From randomization to death from any cause (up to approximately 25 months)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Feb 2025
  2. Study start25 Feb 2025
  3. Primary completion30 Oct 2026 (estimated)
  4. Study completion1 Oct 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
105 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06848699
Sponsor's protocol ID
HLX43HLX10-ST201
Status last verified
Nov 2025
First submitted
22 Jan 2025
Last updated
17 Nov 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing HLX43 dose 1, HLX43 dose 2 and HLX43 dose 3 in people with Solid Tumor Cancer and Non Small Cell Lung Cancer, run by Shanghai Henlius Biotech at 3 sites in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 11 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 17 Nov 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Bo Zhu, Dr (86-023-68755626, bo.zhu@tmmu.edu.cn), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

DLT (time frame: 21 days after the first dose). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Nov 2025.

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