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Solid TumorEarly Phase 1VARTUTRACENCT06645808

PET-imaging of Two Vartumabs in Patients With Solid Tumors

A Early Phase 1 study testing 89Zr-DFO-N-Suc-F8scFv, 89Zr-DFO-N-Suc-C9scFv and PET/CT scan in people with Solid Tumor and Colon Carcinoma, run by Var2 Pharmaceuticals at 1 site in Netherlands.

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

VARTUTRACE is a first-in-human PET/CT molecular imaging study in patients with solid tumors. This study will investigate the biodistribution and pharmacology of two antibody fragments binding oncofetal Chondroitin Sulfate (CS). Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Solid Tumor, Colon Carcinoma, Rectal Carcinoma
What is being tested?
89Zr-DFO-N-Suc-F8scFv, 89Zr-DFO-N-Suc-C9scFv and PET/CT scan
Could I receive a placebo?
No, everyone receives an active treatment
How many people
32 participants
Where
1 siteNetherlands
Study dates
10 Dec 2024to Sep 2026
Phase
Early 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

General Inclusion Criteria:

  1. Willing to adhere to the prohibitions and restrictions specified in this protocol.
  2. Capable of giving signed informed consent (voluntarily), indicating that the patient understands the purpose and procedures required for the study and is willing to comply with the requirements and restrictions listed in the informed consent form and in this protocol.
  3. Patients aged ≥ 18 years at moment of signing informed consent form.
  4. Life expectancy of > 12 weeks.
  5. ECOG (Eastern Cooperative Oncology Group) performance status of 0 or 1.
  6. BMI ≥ 18.0 and ≤ 35.0 kg/m2 and weight at least 50 kg and no more than 120 kg at screening.
  7. Overtly healthy based on medical history, physical findings, vital signs, ECG at the time of screening, as judged by the Investigator. Note: one retest of vital functions and ECG is allowed within the screening window.
  8. Adequate liver- and kidney function, defined by the following laboratory results obtained during screening visit:
  • AST, ALT, and alkaline phosphatase ≤ 2.5x the upper limit of normal (ULN) as determined by the UMCG laboratory reference values.
  • Serum bilirubin ≤ 2.0x ULN as determined by the UMCG laboratory reference values. Patients with known Gilbert disease who have serum bilirubin level ≤ 3x ULN may be enrolled.
  • INR or APTT ≤ 1.5x ULN as determined by the UMCG laboratory reference values. This applies only to patients who are not receiving therapeutic anticoagulation; patients receiving therapeutic anticoagulation should be on a stable dose.
  • eGFR (based on plasma-creatinine) = >30 mL/min.
  • Serum albumin >35 g/L.
  1. No other clinically significant laboratory abnormalities as determined by the investigator. Note: one retest of lab tests is allowed within the screening window.
  2. Female patients should be at least 1 year post-menopausal (amenorrhea >12 months and/or follicle-stimulating hormone >30 mIU/mL) at screening or surgically sterile (bilateral oophorectomy, hysterectomy, or tubal ligation).
  3. Male subjects who are sexually active with a female partner of childbearing potential must agree to the use of an effective method of birth control, and must not donate sperm, until 3 months after administration of 89Zr-DFO-N-Suc-scFv (F8 or C9).

Medical inclusion Criteria:

Colon Carcinoma:

  1. Patients diagnosed with colon carcinoma stage I-IV, according to the 8th edition of the TNM-classification.
  2. Histologically confirmed diagnosis of colon carcinoma.
  3. Neo-adjuvant treatment according to the standard of care.

Rectal Carcinoma:

  1. Patients diagnosed with rectal carcinoma stage I-IV, according to the 8th edition of the TNM-classification.
  2. Histologically confirmed diagnosis of rectal carcinoma.
  3. Neo-adjuvant treatment according to the standard of care.

Bone- and soft-tissue sarcoma

  1. Patients diagnosed with a bone- or soft-tissue sarcoma stage I-IV, according to AJCC staging for Sarcoma.
  2. Histologically confirmed diagnosis of sarcoma.
  3. Neo-adjuvant treatment according to the standard of care.

Breast carcinoma

  1. Patients diagnosed with breast carcinoma stage I-IV, according to the 8th edition of the TNM-classification.
  2. Histologically confirmed diagnosis of breast carcinoma.
  3. Neo-adjuvant treatment according to the standard of care.

Lung Carcinoma:

  1. Anticipated diagnosis of Non-Small Cell Lung Carcinoma (NSCLC) stage I-IV, according to the 8th edition of the TNM-classification, based on imaging modalities such as (PET)/CT or based on cytology.
  2. Neo-adjuvant treatment according to the standard of care.

Head and Neck Squamous Cell carcinoma (HNSCC):

  1. Patients diagnosed with HNSCC of the oral cavity, oropharynx, nasal cavity, nasopharynx, hypopharynx and larynx.
  2. Histologically confirmed diagnosis of HNSCC.
  3. Neo-adjuvant treatment according to the standard of care.

Oesophageal and gastric carcinoma:

  1. Patients diagnosed with oesophagus carcinoma stage I-IV according to the 7th edition of the TNM-classification.
  2. Patients diagnosed with gastric carcinoma stage I-IV according to the 7th edition of the TNM-classification.
  3. Histologically confirmed diagnosis of oesophageal- or gastric carcinoma.
  4. Neo-adjuvant treatment according to the standard of care.

Pancreas carcinoma:

  1. Anticipated diagnosis of pancreas carcinoma stage I-IV according to the 8th edition of the TNM-classification, based on imaging modalities such as (PET)/CT or based on cytology.
  2. Histologically or cytologically confirmed diagnosis of pancreas carcinoma.
  3. Neo-adjuvant treatment according to the standard of care.

Bladder carcinoma:

  1. Patients diagnosed with invasive bladder carcinoma stage I-IV according to the 7th edition of the TNM-classification.
  2. Histologically confirmed diagnosis of bladder carcinoma.
  3. Neo-adjuvant treatment according to the standard of care.

Glioblastoma:

  1. Anticipated diagnosis of a high-grade glioma (glioblastoma, grade 4 according to the WHO classification) based on imaging modalities such as MRI and/or CT or a biopsy.
  2. Karnofsky performance status of at least 70%.
  3. Neo-adjuvant treatment according to the standard of care.

General Exclusion Criteria:

  1. Behavioral or cognitive impairment or psychiatric disease that, in the investigator's opinion, affects the patient's ability to understand and cooperate with the study protocol.
  2. Insufficient venous access for the study procedures.
  3. Close affiliation with the investigator, e.g. a close relative of the investigator, dependent person (e.g. employee or student), employee of the department of surgery or nuclear department of the UMCG,TRACER or affiliates.
  4. Any finding in the medical examinations or medical history giving, in the opinion of the investigator, reasonable suspicion of a disease or condition that makes treatment with the investigational drug unadvisable, or that might affect interpretation of the results of the study or render the patient at high risk for treatment complications.
  5. Participation in an interventional clinical study within 30 days prior to tracer administration that involved treatment with any drug (excluding vitamins and minerals) or medical device.

Medical Exclusion Criteria:

  1. The existence of a second concomitant active malignancy or treatment for a second malignancy within 1 year prior to IMP-administration that is not a solid tumor indication included in the VARTUTRACE study, except for localized basal or squamous cell cancer that has been cured at least 90 days before screening.
  2. Cardiac impairment with an estimated LVEF <35 % Prolonged QTcF (>450 ms), cardiac arrhythmias or any clinically significant abnormalities in the resting ECG at the time of screening, as judged by the investigator.
  3. Any abnormalities in the vital signs of the patient, as judged by the investigator, as a result of which the patient cannot participate. Note: One retest of vital functions is allowed within the screening window.
  4. Any other diseases, metabolic dysfunction, physical examination finding, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or that may affect the interpretation of the results or render the patient at high risk from treatment complications.
  5. Major surgical procedure other than for the included diagnosis within four weeks before IMP administration. Disease-related procedures, e.g. the placement of a port-a-cath, placement of a drain, ERCP, are allowed.
  6. Current evidence or history of bacterial, viral or fungal infections within 7 days before 89Zr-DFON-Suc-scFv (F8 or C9) administration as judged by the Investigator.
  • T > 38.0°C or lab confirmed viral/bacterial/fungal infection (PCR) or symptoms suggestive of an infection)
  • Received oral or IV antibiotics within <7 days before administration.
  1. Any planned major surgery within the duration of the study (until follow-up visit) that is not related to the tumor, with the exception of any emergency surgeries.
  2. Prior allogeneic bone marrow transplantation or solid organ transplant.
  3. A history of anaphylaxis, history of allergic reaction(s), known allergy to one of the drugs or excipients administered as part of this study. Mild allergies without angio-edema or treatment need can be acceptable if deemed not of clinical significance (including allergy to animals or mild seasonal hay fever).
  4. Any other diseases, metabolic dysfunction, physical examination finding, or clinically significant laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or that may affect the interpretation of the results or render the patient at high risk from treatment complications.

Trial locations and contacts

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

Anne-Fleur Verhaar, MD contact

0031622989025

anne-fleur@tracercro.com

Noortje van Dijk, Msc contact

noortje@tracercro.com

Netherlands1 site, 1 recruiting
  • University Medical Center Groningen (UMCG)

    Groningen, Provincie Groningen, 9713GZ

    Anne-Fleur Verhaar, MD, 0031622989025, anne-fleur@tracercro.com

    Noortje van Dijk, Msc, noortje@tracercro.com

    Recruiting

Other trials in Netherlands

About this study

Official title: The Safety, Tolerability and Biodistribution of a Single Intravenous Administration of Two Zirconium-89 Labelled Vartumabs (F8scFV or C9scFv) in Patients With Solid Tumors - a Phase 0, Open Label, PET/CT Molecular Imaging Basket Trial

VARTUTRACE is a first-in-human PET/CT molecular imaging study in patients with solid tumors. This study will investigate the biodistribution and pharmacology of two antibody fragments binding oncofetal Chondroitin Sulfate (CS).

Oncofetal CS are tumor-specific carbohydrate motifs present in proteoglycans and identified by VAR2 Pharmaceuticals as expressed during fetal development. Oncofetal CS reappears in the vast majority of cancers while remaining largely absent from normal tissues.

VAR2 Pharmaceuticals recently developed antibodies specific for oncofetal CS. VARTUTRACE uses two of these as radiolabeled antibody fragments to study biodistribution, tumor accumulation, pharmacodynamics and clearance pathways in a diverse patient population.

Read the detailed description

VARTUTRACE aims to investigate the biodistribution and pharmacology in patients with solid tumors of two antibody fragments specific for oncofetal CS.

VAR2 Pharmaceuticals has identified and characterized oncofetal CS as a group of tumor-specific carbohydrate motifs that appear in placental tissue during fetal development and in most cancers while remaining largely absent from healthy tissue. VAR2 Pharmaceuticals recently developed a panel of antibodies specific for oncofetal CS and characterized their tumor specificity, therapeutic, and safety in pre-clinical models under various formats.

VARTUTRACE is a Phase 0 microdosing study of a single administration of <30 nmol of one of the two most promising antibody fragments identified by VAR2 Pharmaceuticals - C9 and F8. Both antibody fragments will be used as short chain variable fragments (scFvs) labelled with the radioisotope Zirconium-89 (89Zr) and are therefore respectively named 89Zr-C9scFv or 89Zr-F8scFv. As it remains unclear from the pre-clinical in vitro and in vivo data which of the two will have the most optimal tumor targeting properties in patients with solid tumors, both scFvs will be evaluated.

The biodistribution, pharmacokinetics, pharmacodynamics, and clearance of two of these antibody fragments is planned to be studied in up to 32 patients with various cancers (i.e. a basket-trial).

Being tested
89Zr-DFO-N-Suc-F8scFv, 89Zr-DFO-N-Suc-C9scFv, PET/CT scan
Keywords
Basket-trial, Oncology, Solid tumors
Medical subject headings
Colonic Neoplasms, Rectal Neoplasms, Osteosarcoma, Chondrosarcoma, Lung Neoplasms, Squamous Cell Carcinoma of Head and Neck, Esophageal Neoplasms, Stomach Neoplasms

What participants receive

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

  • 89Zr-DFO-N-Suc-F8scFvBiological

    89-Zirconium labeled short-chain variable fragment F8 targeting oncofetal CS.

  • 89Zr-DFO-N-Suc-C9scFvBiological

    89-Zirconium labeled short-chain variable fragment C9 targeting oncofetal CS.

  • PET/CT scanRadiation

    IMP administration will be followed by PET/CT scans on day 1, 2 and 4.

Study groups in NCT06645808
Study groupRoleWhat they receive
89Zr-F8scFvExperimentalThe first 3 patients of this arm will receive a single i.v. microdose (1 mg) administration of 89Zr-F8scFv 15 MBq, followed by three whole-body PET/CT scans on day 1, 2 and 4. After the first three patients, an interim analysis will be conducted to determine the optimal scanning time point and radiation dose. The following 13 patients will receive a single i.v. microdose administration of 89Zr-F8scFv between 15 - 30 MBq, followed by one whole-body PET/CT scan on the optimal scanning day (day 1-7). Each subject will have a follow-up visit approximately 28 days after IMP administration.
Receives: Biological: 89Zr-DFO-N-Suc-F8scFv; Radiation: PET/CT scan
89Zr-C9scFvExperimentalThe first 3 patients of this arm will receive a single i.v. microdose (1 mg) administration of 89Zr-C9scFv 15 MBq, followed by three whole-body PET/CT scans on day 1, 2 and 4. After the first three patients, an interim analysis will be conducted to determine the optimal scanning time point and radiation dose. The following 13 patients will receive a single i.v. microdose administration of 89Zr-C9scFv between 15 - 30 MBq, followed by one whole-body PET/CT scan on the optimal scanning day (day 1-7). Each subject will have a follow-up visit approximately 28 days after IMP administration.
Receives: Biological: 89Zr-DFO-N-Suc-C9scFv; Radiation: PET/CT scan

What is being measured

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

  1. Biodistribution and pharmacokinetics of the radiolabeled IMP

    Biodistribution and pharmacokinetics of the IMP are defined by the amount of IMP that is taken up per target organ or tissue over time. The radioactive dose absorbed per target organ or tissue over time is determined using whole-body PET/CT imaging at various time points post-injection. In addition, blood samples will be taken at various time points post-injection to determine IMP plasma level concentrations. The ICRP 89 values will be used to calculate the effective dose in each organ. Descriptive statistics of absorbed doses to target organs and tissues specified will be tabulated. The blood concentrations will be presented using descriptive summary statistics.

    Measured: Day 1, 2, and 4 after dosing

  2. Tumor-specific uptake of the IMP

    Tumor-specific uptake of the IMP is defined as the amount of IMP that tumors uptake compared to normal tissue. Tumor-specific uptake of the IMP is captured using PET/CT imaging and quantified by calculating the tumor-to-background ratio (TBR), which is determined by the ratio of radioactivity taken up by the tumor and radioactivity taken up by healthy reference tissue. A qualified PET investigator will obtain the raw data. PET/CT-derived TBR will be quantified for each patient and compared to standard of care imaging techniques. Variables will be presented as qualitative data. Data interpretation is considered descriptive.

    Measured: Day 1 - 7 after dosing

  3. Incidence of treatment emergent adverse events (AE) (safety and tolerability)

    Safety and tolerability will be assessed by the number of participants with treatment-emergent AEs, with abnormal laboratory tests results (including the occurrence of anti-drug antibodies), abnormal vital signs, abnormal ECG readings, and abnormal physical examination findings from the time of i.v. administration of the IMP until the end of the follow-up period. For this objective, variables will be presented as qualitative data. Interpretations of this data will be descriptive

    Measured: Study duration (up to 56 days)

Secondary outcomes (1)
  1. Tumor-specific uptake of the IMP per cancer type

    Tumor-specific uptake of the IMP will be quantified, as described in outcome measure 2, for each cancer type and compared across cancer types included in this study. Variables will be presented as qualitative data. Data interpretation is considered descriptive.

    Measured: Day 1 -7 after dosing

Timeline

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

  1. First posted17 Oct 2024
  2. Study start10 Dec 2024
  3. Primary completionAug 2026 (estimated)
  4. Study completionSep 2026 (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
Early Phase 1
Primary purpose
Other
Allocation
Non-randomised
Intervention model
Sequential
Model description
Initially, three patients per compound (89Zr-C9scFv and 89Zr-F8scFv) will be included according to alternating inclusion or patient availability (n=6). Subsequently, an interim analysis will be conducted to determine the optimal radiation dose and optimal scanning day for each radiolabeled antibody fragment. After the interim analysis, cohorts will be expanded with additional solid tumor indications and will include 13 more subjects per compound (n=26), resulting in 32 subjects overall. This basket trial aims to include at least one patient per indication. For expansion cohort subjects, IMP-administration will occur on day 1, with one PET/CT scan performed on the most optimal day (this was determined to be day 4). Optionally, patients can receive an additional day 6 scan to gain more insight into tumor retention.
Masking
None (open label)
Enrolment
32 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06645808
Sponsor's protocol ID
VAR2-2024-CS01
Other IDs
2024-513827-18-00
Acronym
VARTUTRACE
Status last verified
Dec 2025
First submitted
28 Aug 2024
Last updated
29 Dec 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Early Phase 1 study testing 89Zr-DFO-N-Suc-F8scFv, 89Zr-DFO-N-Suc-C9scFv and PET/CT scan in people with Solid Tumor and Colon Carcinoma, run by Var2 Pharmaceuticals at 1 site in Netherlands.

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

Who may be eligible to take part?

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 29 Dec 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Netherlands. 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?

Early Phase 1 (sometimes called Phase 0) studies give a very small amount of a treatment to a few people, mainly to see how the body handles it.

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 Anne-Fleur Verhaar, MD (0031622989025, anne-fleur@tracercro.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Biodistribution and pharmacokinetics of the radiolabeled IMP (time frame: Day 1, 2, and 4 after dosing). 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 29 Dec 2025.

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