Direct Oral Anticoagulants (DOACs) Versus LMWH +/- Warfarin for VTE in Cancer (CANVAS)

Alliance Foundation Trials

Status: Completed

Conditions: Venous Thromboembolism; Blood Clot; Deep Vein Thrombosis (DVT); Cancer; Pulmonary Embolism (PE)

Treatments: Drug: Warfarin; Drug: Rivaroxaban; Drug: Dabigatran; Drug: Dalteparin; Drug: Apixaban; Drug: Edoxaban; Drug: Fondaparinux; Drug: Enoxaparin

Study type: Interventional

Funder types: Other

Identifiers

NCT02744092

CER-1503-29805 (Other Grant/Funding Number)

AFT-28

Details and patient eligibility

About

The overarching objective of the study is to determine the effectiveness of LMWH/ warfarin vs. DOAC anticoagulation for preventing recurrent VTE in cancer patients. The intervention strategy is Direct Oral AntiCoagulants (DOAC) therapy with edoxaban, apixaban, rivaroxaban, or dabigatran. The comparator is low molecular weight heparin (LMWH) alone or with warfarin. The information gained will empower cancer patients and physicians to make more informed choices about anticoagulation strategies to manage VTE.

Full description

Venous blood clots affect nearly a million Americans each year. Venous clots in the legs are called deep venous thrombosis (DVT) and are dangerous because they travel to the lungs where they cause blockages known as pulmonary emboli (PE). DVT and PE are called venous thromboemboli (VTE). Cancer is a risk factor with nearly 200,000 VTEs in cancer patients each year. The purpose of VTE treatment is to prevent the initial clot from spreading and to prevent new clots from forming. This is accomplished by thinning the blood, or anticoagulation. Without anticoagulation, VTEs recur and are often fatal.

Recently, the FDA has approved 4 new Direct Oral AntiCoagulants (DOACs) for preventing VTE recurrence. Few cancer patients were included in the efficacy trials, and practice guidelines fall silent on whether switching to DOAC therapy is advisable. To fill this knowledge gap, the Alliance Foundation Trials LLC, a research network of academic and community practices across the US, is conducting a pragmatic randomized effectiveness trial.

The overarching objective of the study is to determine the effectiveness of LMWH/ warfarin vs. DOAC anticoagulation for preventing recurrent VTE in cancer patients. The investigators will conduct a trial of 811 cancer patients followed for 6 months. The intervention strategy is DOAC therapy with edoxaban, apixaban, rivaroxaban, or dabigatran. The comparator is LMWH alone or with warfarin. Within each arm, patients can choose the agent they prefer based on side effects, drug interactions, and practical issues such as co-pays. The trial compares these two strategies in terms of treatment: 1) benefits based on VTE recurrence; 2) harms based on bleeding rates; 3) burdens based on patients' reports of their experiences; and 4) mortality rates.

The investigators hypothesize that the benefits, harms and burdens of DOAC treatment will be non-inferior to, or better than, usual care with LMWH/ warfarin among cancer patients. The information gained will empower cancer patients and physicians to make more informed choices about anticoagulation strategies to manage VTE.

Enrollment: 811 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Diagnosis of advanced solid tumor cancer, lymphoma, or myeloma (no time restrictions or limitations) -OR- diagnosis of early stage solid tumor cancer, lymphoma, or myeloma <= 12 months prior to study enrollment

• Diagnosis of VTE <= 30 days prior to study enrollment for which potential benefits of anticoagulation therapy to prevent recurrence of VTE are felt by the treating physician to exceed the potential harms

  • Any anticoagulation drug/strategy may be used to treat the index VTE; protocol treatment will begin <= 30days after the index VTE diagnosis date

• Treating physician intends to put participant on anticoagulation therapy for at least three months.

• Age >= 18 years

• Platelet count is >= 50,000/mm^3 (<= 7 days prior to enrollment)

• CrCl (Creatinine Clearance) is >= 15 ml/min (<= 7 days prior to enrollment)

Exclusion criteria

• Diagnosis of acute leukemia

• Has ever received or is scheduled to receive an Allogeneic Hematopoietic Stem Cell Transplantation (alloHSCT)

  • Patients who have ever received an Autologous Hematopoietic Stem Cell Transplantation (autoHSCT) ARE eligible.
  • Patients who are scheduled to receive an Autologous Hematopoietic Stem Cell Transplantation (autoHSCT) are NOT eligible

• Ongoing, clinically significant bleeding (CTCAE grade 3 or 4)

• Ongoing therapy with a P-gp inhibitor (e.g., nelfinavir, indinavir, or saquinavir-protease inhibitors for HIV) as these drugs interact with the factor Xa inhibitors

• Therapy with any azole antifungals (e.g., itraconazole, ketaconazole, voriconazole) at the time of enrollment

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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811 participants in 4 patient groups

Randomized Arm 1 (DOACs)

Active Comparator group

Description:

Randomized Arm 1 will get anticoagulation therapy with a Direct Oral AntiCoagulant (DOAC). There are four FDA-approved DOAC drugs that may be used for this study: Rivaroxaban, Apixaban, Edoxaban, or Dabigatran. The treatment (including dosage form, dosage, frequency and duration) should be administered in accordance with the drug's FDA package insert, and all modifications are at the discretion of the treating investigator.

Treatment:

Drug: Apixaban

Drug: Edoxaban

Drug: Rivaroxaban

Drug: Dabigatran

Randomized Arm 2 (LMWH)

Active Comparator group

Description:

Randomized Arm 2 will get anticoagulation therapy with low molecular weight heparin (LMWH) with or without a transition to warfarin. There are three FDA-approved LMWH drugs that may be used for this study: Dalteparin, Enoxaparin, or Fondaparinux. The treatment (including dosage form, dosage, frequency and duration) should be administered in accordance with the drug's FDA package insert, and all modifications are at the discretion of the treating investigator.

Treatment:

Drug: Warfarin

Drug: Enoxaparin

Drug: Dalteparin

Drug: Fondaparinux

Preference Cohort 1 (DOACs)

Active Comparator group

Description:

If an eligible participant is offered randomization and declines randomization, then a limited number of participants (up to N=190) will be allowed to enroll in the Preference Cohort. In this case, the treating physician and patient choose Arm 1 or Arm 2 (non-randomized). Preference cohort: Non-randomized Arm 1 will get anticoagulation therapy with a Direct Oral AntiCoagulant (DOAC).

Treatment:

Drug: Apixaban

Drug: Edoxaban

Drug: Rivaroxaban

Drug: Dabigatran

Preference Cohort 2 (LMWH)

Active Comparator group

Description:

If an eligible participant is offered randomization and declines randomization, then a limited number of participants (up to N=190) will be allowed to enroll in the Preference Cohort. In this case, the treating physician and patient choose Arm 1 or Arm 2 (non-randomized). Preference cohort: Non-randomized Arm 2 will get anticoagulation therapy with Low Molecular Weight Heparin (LMWH) with or without a transition to warfarin.

Treatment:

Drug: Warfarin

Drug: Enoxaparin

Drug: Dalteparin

Drug: Fondaparinux