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TerminatedPhase 3

A Study Comparing Abelacimab to Apixaban in the Treatment of Cancer-associated VTE

Key facts

Who runs it
Anthos Therapeutics, Inc.
Where
Aurora, Boston, Cleveland, Commack, Detroit, Durham, Evanston, Harrison, Houston, La Crosse, Lexington, Miami, Middletown, Milwaukee, New York, Oklahoma City, Philadelphia, Rochester, San Antonio, St Louis, Washington D.C., and West Haven, United StatesSee the 23 sitesAlso in 20 other countries, 186 sites
Status
Terminated
Phase
Phase 3
People taking part
1,150 people enrolled
Started
5 May 2022
Ended
4 Feb 2026
Type of study
Interventional, 2 groupsOne group gets an existing treatment, for comparison.
Treatments tested
  • Abelacimab
  • Apixaban
Record updated
23 February 2026
Why it stopped
Sponsor decision

Who can take part

Age
18 years and older
Sex
Women and men
Healthy volunteers
Cannot take part

The registry criteria, word for word

Show all 30 criteriaShow less

Who can take part

  • Male or female subjects ≥18 years old or other legal maturity age according to the country of residence
  • Confirmed diagnosis of cancer (by histology, adequate imaging modality), other than basal-cell or squamous-cell carcinoma of the skin alone with one of the following:; Active cancer, defined as either locally active, regionally invasive, or metastatic cancer at the time of randomization and/or; Currently receiving or having received anticancer therapy (radiotherapy, chemotherapy, hormonal therapy, any kind of targeted therapy or any other anticancer therapy) in the last 6 months
  • Confirmed symptomatic or incidental proximal lower limb deep vein thrombosis (DVT) (i.e., popliteal, femoral, iliac, and/or inferior vena cava [IVC] thrombosis) and/or a confirmed symptomatic pulmonary embolism (PE), or an incidental PE in a segmental, or larger pulmonary artery; Patients are eligible within 120 hours from diagnosis of the qualifying VTE
  • Anticoagulation therapy with a therapeutic dose of DOAC for at least 6 months is indicated
  • Able to provide written informed consent

Who cannot take part

  • More than 120 hours of pre-treatment with therapeutic doses of UFH, LMWH, fondaparinux, DOAC, or other anticoagulants
  • An indication to continue treatment with therapeutic doses of an anticoagulant other than that VTE treatment prior to randomization (e.g., atrial fibrillation [AF], mechanical heart valve, prior VTE)
  • Brain trauma or a cerebral or spinal cord surgery or spinal procedures such as lumbar puncture or epidural/spinal anesthesia within 4 weeks of screening
  • Patients known to be receiving strong dual inducers or inhibitors of both CYP3A4 and P gp
  • Use of other investigational (not registered) drugs within 5 half-lives prior to enrollment or until the expected pharmacodynamic(s) (PD) effect has returned to baseline, whichever is longer. Participation in academic non-interventional studies or interventional studies, comprising testing different strategies or different combinations of registered drugs is permitted
  • Acute ischemic or hemorrhagic stroke or intracranial hemorrhage within the 4 weeks preceding screening
  • Primary brain cancer or untreated intracranial metastases at baseline
  • Bleeding requiring medical attention at the time of randomization or in the preceding 4 weeks
  • Planned brain, spinal cord, cardiac, vascular, major thoracic and/or major abdominal surgery in the 4 weeks following randomization
  • Uncontrolled hypertension (systolic BP>180 mm Hg or diastolic BP >100 mm Hg despite antihypertensive treatment)
  • History of hypersensitivity to any of the study drugs (including apixaban) or excipients, to drugs of similar chemical classes, or any contraindication listed in the label for apixaban
  • Subjects with any condition that in the Investigator's judgement would place the subject at increased risk of harm if he/she participated in the study
  • Platelet count <50,000/mm3 at the screening visit
  • Calculated creatinine clearance (CrCl) <30 mL/min (Cockcroft-Gault equation) at the screening visit
  • Hemoglobin <8 g/dL at the screening visit
  • Acute hepatitis, chronic active hepatitis, liver cirrhosis; or an alanine aminotransferase (ALT) ≥3 x and/or bilirubin ≥2 x upper limit of normal (ULN) at the screening visit in absence of clinical explanation
  • Thrombectomy, insertion of a caval filter or use of a fibrinolytic agent to treat the current (index) DVT and/or PE
  • PE leading to hemodynamic instability (blood pressure [BP] <90 mmHg or shock)
  • Need for aspirin in a dosage of >100 mg/day or any other antiplatelet agent alone or in combination with aspirin
  • Acute myeloid or lymphoid leukemia
  • Eastern Cooperative Oncology Group (ECOG) performance status of 3 or 4 at screening
  • Life expectancy <3 months at randomization
  • Women of child-bearing potential (WOCBP) who are unwilling or unable to use highly effective contraceptive measures during the study from screening up to 3 days after last treatment of apixaban or 100 days after administration of abelacimab (See Section 5.3.6. for highly effective contraceptive measures)
  • Sexually active males with sexual partners of childbearing potential must agree to use a condom or other reliable contraceptive measure up to 3 days after last treatment of apixaban or 100 days after administration of abelacimab
  • Pregnant or breast-feeding women

Where in United States

Also in 20 other countries, 186 sites

  • University of Colorado Anschutz Medical CampusAurora, United States
  • Beth Israel Deaconess Medical CenterBoston, United States
  • Brigham and Women's HospitalBoston, United States
  • Cleveland Clinic FoundationCleveland, United States
  • Memorial Sloan Kettering Cancer Center - CommackCommack, United States
  • Henry Ford Health SystemDetroit, United States
  • Duke University Medical CenterDurham, United States
  • Northshore University Health SystemEvanston, United States
  • Memorial Sloan Kettering Cancer Center West HarrisonHarrison, United States
  • MD Anderson Cancer CenterHouston, United States
  • Gundersen Health SystemLa Crosse, United States
  • University of Kentucky/Markey Cancer CenterLexington, United States
  • University of Miami HealthMiami, United States
  • Memorial Sloan Kettering Cancer Center-MiddletownMiddletown, United States
  • Blood Center of WisconsinMilwaukee, United States
  • Memorial Sloan-Kettering Cancer CenterNew York, United States
  • University of Oklahoma Health Sciences CenterOklahoma City, United States
  • University of Pennsylvania - Penn Blood Disorders CenterPhiladelphia, United States
  • Lipson Cancer InstituteRochester, United States
  • University of Texas Mays Cancer CenterSan Antonio, United States
  • Washington UniversitySt Louis, United States
  • Washington DC VAMCWashington D.C., United States
  • VA Connecticut Healthcare SystemWest Haven, United States

About the trial

What the trial wants to find out

This is a Phase 3,multicenter, randomized, open-label, blinded endpoint evaluation study comparing the effect of abelacimab relative to apixaban on venous thromboembolism (VTE) recurrence and bleeding in patients with cancer associated VTE (ASTER)

The 2 groups in the trial

  • AbelacimabTreatment being tested

    Abelacimab intravenous administration followed by monthly administration of the same dose subcutaneously

  • ApixabanExisting treatment, for comparison

    Apixaban administered orally twice a day

Data and sources

Registry record
Listed on ClinicalTrials.gov and on the EU's official list of trials (CTIS).
Official title
A Multicenter, Randomized, Open-label, Blinded Endpoint Evaluation, Phase 3 Study Comparing the Effect of Abelacimab Relative to Apixaban on Venous Thromboembolism (VTE) Recurrence and Bleeding in Patients With Cancer Associated VTE
Record updated
23 February 2026