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CancerPhase 1NCT07424547

Phase I Study of SYS6043 in Patients With Advanced/Metastatic Solid Tumors

A Phase 1 study testing SYS6043 in people with Cancer and Solid Tumor Cancer, run by Conjupro Biotherapeutics, Inc. at 5 sites in United States.

Recruiting

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

Sites and contacts
Official record
Search all trials

Trial summary

The goal of this clinical trial is to learn if investigational drug called SYS6043 works in adults with advanced or metastatic solid tumors that have spread or cannot be treated with standard therapies. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
SYS6043
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
386 participants
Where
5 sitesUnited States
Study dates
3 Mar 2026to Apr 2030
Phase
Phase 1
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 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Major:
  • Aged ≥18 years old (on the date of signing the ICF).
  • Advanced/unresectable or metastatic solid tumors confirmed by histology or cytology, disease recurrence or progression during or after systemic standard of care, and should be intolerant of or have no available standard of care therapy.
  • Have at least one measurable lesion, according to the Response Evaluation Criteria in Solid Tumors (RECIST V1.1). Participants with metastatic castration-resistant prostate cancer (mCRPC) who have only metastases to bone will be evaluated through discussion with the sponsor's medical monitor, before determining whether they can be enrolled.
  • Expected life expectancy of ≥ 3 months.
  • ECOG performance status of 0-1 and no worsening of the score within 28 days prior to enrollment.
  • LVEF ≥ 50% as shown by ECHO or MUGA within 28 days prior to enrollment.

Who cannot join

  • Major:
  • Prior B7-H3 targeted therapy.
  • Previously received drug therapy with topoisomerase inhibitor antibody-drug conjugate (e.g., trastuzumab deruxtecan).
  • Symptomatic congestive heart failure (CHF) (New York Heart Association [NYHA] Class II-IV) or a history of severe arrhythmia requiring treatment.
  • History of myocardial infarction or unstable angina within 6 months prior to enrollment.
  • Based on the results of three 12-lead electrocardiogram (ECG) examinations, the mean QT interval (QTcF) corrected by the Fridericia formula for both males and females is prolonged to >470 ms.
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  • Unable or unwilling to discontinue concomitant medications known to prolong the QT interval.
  • History of interstitial lung disease (e.g., ILD/non-infectious pneumonia requiring glucocorticoid treatment in the past), or currently have interstitial lung disease, or are suspected to have such diseases through imaging examinations during screening.
  • History of underlying lung disorders, including but not limited to pulmonary embolism within 3 months prior to the start of study treatment, severe asthma, severe COPD, restrictive pulmonary disease, and other clinically significant lung injuries or requiring supplemental oxygen.
  • Any autoimmune diseases, connective tissue disorders, or inflammatory diseases involving the lungs recorded or suspected during screening (e.g., rheumatoid arthritis, Sjögren's syndrome, sarcoidosis, etc.).
  • Presence of uncontrolled infection requiring intravenous injection of antibiotics, antiviral drugs, or antifungal drugs.
  • Active and clinically significant bacterial, fungal, viral infection, or Hepatitis C infection at screening (HCV antibodies test positive and HCV-RNA levels higher than the lower limit of quantification or 1000 copies/mL (whichever is lower); HIV antibody positive or syphilis antibody positive (with confirmation)..
  • HBsAg positive and HBV-DNA above the lower limit of quantification or 1,000 copies/mL (500 IU/mL) (whichever is lower). Liver tumor: For participants with liver metastases and HBV infection, HBV DNA must be <2000 IU/mL before the first dose. Participants who are HBsAg-positive and/or HBV DNA-positive should receive at least 2 weeks of anti-Hepatitis B virus treatment prior to the first dose and be willing to continue treatment during the study.
  • Lactating women (women who are willing to temporarily discontinue breastfeeding will also be excluded), or women confirmed to be pregnant by pregnancy test within 7 days prior to enrollment.
  • Presence of spinal cord compression or clinically active brain metastasis, and/or meningeal metastases, defined as untreated, symptomatic, or requiring corticosteroids or anticonvulsants.

Trial locations and contacts

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

Director, Clinical Operations contact

609-356-0210

clinicaltrials.gov@cspcus.com

Regulatory Operations Manager contact

609-356-0210

clinicaltrials.gov@cspcus.com

5 sites in 1 country

United States5 sites, 5 recruiting
  • NEXT Oncology Austin

    Austin, Texas, 78758

    Dr Sahota, Principal Investigator, 210-580-9500

    Dr Sahota

    Recruiting
  • NEXT Oncology Virginia

    Fairfax, Virginia, 22031

    Dr Salkeni, Principal Investigator, 210-580-9500

    Dr Salkeni

    Recruiting
  • BRCR Global

    Plantation, Florida, 33322

    Dr Sawhney, Principal Investigator, 561-447-0614

    Dr Sawhney

    Recruiting
  • Florida Clinical Trials Group

    Plantation, Florida, 33322

    Dr Amin, Principal Investigator, 772-297-3057

    Dr Amin

    Recruiting
  • NEXT Oncology San Antonio

    San Antonio, Texas, 78229

    Dr Sommerhaulder, Principal Investigator, 210-580-9500

    Dr Sommerhalder

    Recruiting

Other trials in United States

About this study

Official title: Phase I Dose Escalation and Cohort Expansion Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Efficacy of SYS6043 in Patients With Advanced/Metastatic Solid Tumors

The goal of this clinical trial is to learn if investigational drug called SYS6043 works in adults with advanced or metastatic solid tumors that have spread or cannot be treated with standard therapies. The main goals of the study are to understand how safe SYS6043 is, what side effects it may cause, and what dose can be given safely. Researchers will also study how the drug moves through the body and whether the immune system reacts to it. In addition, the study will look for early signs that SYS6043 may help slow or shrink tumors and explore whether the amount of a tumor protein called B7-H3 is related to how well the treatment works.

Participants will:

  • Provide written informed consent
  • Undergo screening tests to ensure they are eligible for study treatment
  • Attend all required study visits and receive SYS6043 by intravenous infusion once every 3 weeks (Q3W), with 21 days as one treatment cycle until the study doctor determines that study treatment should be stopped based on how well a participant is doing on treatment.
  • Have safety follow-up (SFU), and long-term follow-up.
  • Be followed until progression.
Read the detailed description

This is a multicenter, open-label, Phase I study of dose escalation, PK expansion, and cohort expansion, aiming to evaluate the safety, tolerability, PK characteristics, and preliminary anti-tumor efficacy of SYS6043 (a B7-H3-targeted antibody-drug conjugate) in patients with advanced/metastatic solid tumors. It includes three parts, namely dose escalation, PK expansion, and cohort expansion.

Phase Ia dose escalation is the first part (Part 1) of this study. The dose escalation is carried out using BOIN design, to evaluate the MTD/maximum administered dose (MAD) and the RP2D.

Phase Ia PK expansion (Part 2) will be conducted at 2-3 dose levels deemed acceptable (≤MTD) in terms of safety/tolerability as assessed by the SMC, to further evaluate the safety, tolerability, PK characteristics, and preliminary anti-tumor activity of SYS6043.

Phase Ib cohort expansion (Part 3) will further evaluate the safety and efficacy of SYS6043 at the selected RP2D dose (1-2 dose levels).

A safety monitoring committee (SMC) will be established for this study. The SMC will continuously review safety during the study period and make decisions on adjustments to dose escalation, addition of new dose groups, recommended doses, and recommended exploratory cohorts. For details, please refer to the SMC Charter.

Being tested
SYS6043
Keywords
ovarian cancer, breast cancer, small cell lung cancer, prostate cancer
Medical subject headings
Neoplasms, Small Cell Lung Carcinoma, Ovarian Neoplasms, Breast Neoplasms, Prostatic Neoplasms

What participants receive

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

  • SYS6043Drug

    Administered by intravenous injection

Study groups in NCT07424547
Study groupRoleWhat they receive
Phase Ia dose escalation is the first part (Part 1) of this study.ExperimentalThe dose escalation is carried out using BOIN design, to evaluate the MTD/maximum administered dose (MAD) and the RP2D (Recommended phase II dose).
Receives: Drug: SYS6043
Phase Ia PK expansion (Part 2).ExperimentalPhase Ia PK expansion (Part 2) will be conducted at 2-3 dose levels deemed acceptable (≤MTD) in terms of safety/tolerability as assessed by the SMC, to further evaluate the safety, tolerability, PK characteristics, and preliminary anti-tumor activity of SYS6043.
Receives: Drug: SYS6043
Phase Ib cohort expansion (Part 3).ExperimentalPhase Ib cohort expansion (Part 3) will further evaluate the safety and efficacy of SYS6043 at the selected RP2D dose (1-2 dose levels). Based on the obtained clinical study data and the participants' benefit/risk assessments, the SMC may consider initiating some or all of the following cohorts and may terminate enrollment for certain cohorts early based on clinical study data after initiation: Cohort 1: Extensive-stage small cell lung cancer (ES-SCLC) after treatment failure of systemic standard of care; Cohort 2: Advanced/unresectable or metastatic HR+ HER2- breast carcinoma Cohort 3: Advanced/unresectable or metastatic castration-resistant prostate cancer (mCRPC) after treatment failure of systemic standard of care. Participants with prostate cancer whose disease is limited to metastases to bone will comprise no more than 20% of the enrolled population; Cohort 4: Advanced/unresectable or metastatic ovarian carcinoma
Receives: Drug: SYS6043

What is being measured

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

  1. Assessment of the MTD and/or RP2D (recommended Phase II dose) (Phase 1a).

    Assessment of the MTD and/or RP2D (recommended Phase II dose).

    Measured: An average of 1 year.

  2. Incidence of Treatment-Emergent Adverse Events and dose-limiting toxicities (DLTs) [Safety and Tolerability] of SYS6043 during the study (Phase 1a)

    Number of participants with dose-limiting toxicities (DLTs) as assessed by NCI CTCAE v5.0

    Measured: An average 1 year

Secondary outcomes (7)
  1. SYS6043 Pharmacokinetic

    SYS6043 Pharmacokinetic: Peak Plasma Concentration (Cmax)

    Measured: An average 1 year

  2. SYS6043 Pharmacokinetic

    SYS6043 Pharmacokinetic: Area under the plasma concentration versus time curve (AUC)

    Measured: An average 1 year

  3. SYS6043 Pharmacokinetic

    SYS6043 Pharmacokinetic: Elimination half-life (t1/2)

    Measured: An average 1 year

  4. SYS6043 Pharmacokinetic

    SYS6043 Pharmacokinetic: Clearance (CL)

    Measured: An average 1 year

  5. Objective response rate (ORR)

    Objective response rate (ORR). ORR is defined as the proportion of patients in whom a complete response (CR) or partial response (PR), per Response Evaluation Criteria in Solid Tumors is observed as best overall response.

    Measured: An average 1 year

  6. SYS6043 Immunogenicity

    SYS6043 Immunogenicity: Number of participants with anti-drug-antibody (ADA).

    Measured: An average 1 year

  7. B7-H3 protein expression levels

    B7-H3 protein expression levels

    Measured: An average 1 year

Timeline

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

  1. First posted20 Feb 2026
  2. Study start3 Mar 2026
  3. Primary completionDec 2029 (estimated)
  4. Study completionApr 2030 (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
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Sequential
Model description
This study will employ the Bayesian optimal interval (BOIN) design. BOIN design stage: The target toxicity rate for MTD is 0.3; the sample size of the BOIN design stage is approximately 36. Dose escalation and de-escalation decisions will be made based on the occurrence of DLTs during the observation period. After the end of study, isotonic regression will be used to determine the MTD.
Masking
None (open label)
Enrolment
386 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07424547
Sponsor's protocol ID
SYS6043-US-001
Status last verified
Mar 2026
First submitted
4 Feb 2026
Last updated
7 Apr 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Publications

  • Diagnosis And Treatment Guidelines For Colorectal Cancer Working Group CSOCOC. Chinese Society of Clinical Oncology (CSCO) diagnosis and treatment guidelines for colorectal cancer 2018 (English version). Chin J Cancer Res. 2019 Feb;31(1):117-134. doi: 10.21147/j.issn.1000-9604.2019.01.07. No abstract available.

    PubMed 30996570
  • Chengyu Yan et al., 2023.Research Progress in Immunotherapy of Esophageal Cancer. Advances in Clinical Medicine; 13(5): 8107-8115.

  • Ganti AKP, Loo BW, Bassetti M, Blakely C, Chiang A, D'Amico TA, D'Avella C, Dowlati A, Downey RJ, Edelman M, Florsheim C, Gold KA, Goldman JW, Grecula JC, Hann C, Iams W, Iyengar P, Kelly K, Khalil M, Koczywas M, Merritt RE, Mohindra N, Molina J, Moran C, Pokharel S, Puri S, Qin A, Rusthoven C, Sands J, Santana-Davila R, Shafique M, Waqar SN, Gregory KM, Hughes M. Small Cell Lung Cancer, Version 2.2022, NCCN Clinical Practice Guidelines in Oncology. J Natl Compr Canc Netw. 2021 Dec;19(12):1441-1464. doi: 10.6004/jnccn.2021.0058.

    PubMed 34902832

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing SYS6043 in people with Cancer and Solid Tumor Cancer, run by Conjupro Biotherapeutics, Inc. at 5 sites in United States.

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 7 inclusion and 15 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 7 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 5 sites in United States. 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 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.

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 Director, Clinical Operations (609-356-0210, clinicaltrials.gov@cspcus.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Assessment of the MTD and/or RP2D (recommended Phase II dose) (Phase 1a). (time frame: An average of 1 year.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07424547, which also lists 3 linked publications.

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 7 Apr 2026.

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