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Residual Vein Thrombosis and the Optimal Duration of Low Molecular Weight Heparin in Cancer Patients With Deep Vein Thrombosis (Cancer-DACUS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00450645
Recruitment Status : Unknown
Verified March 2009 by Azienda Ospedaliera Universitaria Policlinico.
Recruitment status was:  Recruiting
First Posted : March 22, 2007
Last Update Posted : March 4, 2009
Information provided by:
Azienda Ospedaliera Universitaria Policlinico

Tracking Information
First Submitted Date  ICMJE March 20, 2007
First Posted Date  ICMJE March 22, 2007
Last Update Posted Date March 4, 2009
Study Start Date  ICMJE March 2005
Estimated Primary Completion Date March 2009   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: March 3, 2009)
Recurrent Deep Vein Thrombosis and/or Pulmonary Embolism [ Time Frame: 30 days ]
Original Primary Outcome Measures  ICMJE
 (submitted: March 20, 2007)
  • Recurrent Deep Vein Thrombosis and/or Pulmonary Embolism
  • Major bleeding
  • Death to venous thromboembolism
Change History
Current Secondary Outcome Measures  ICMJE
 (submitted: March 3, 2009)
  • Minor bleeding [ Time Frame: 30 days ]
  • Death due to cancer [ Time Frame: 30 days ]
Original Secondary Outcome Measures  ICMJE
 (submitted: March 20, 2007)
  • Minor bleeding
  • Death due to cancer
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE Residual Vein Thrombosis and the Optimal Duration of Low Molecular Weight Heparin in Cancer Patients With Deep Vein Thrombosis
Official Title  ICMJE Residual Vein Thrombosis Establishes the Optimal Duration of Low Molecular Weight Heparins in Cancer Patients With Deep Vein Thrombosis of the Lower Limbs
Brief Summary The duration of anticoagulant treatment in cancer patients with Deep Vein Thrombosis (DVT) of the lower limbs is still uncertain. The present study addresses the possible role of the Residual Vein Thrombosis (RVT) for establishing the optimal duration of Low Molecular Weight Heparin (LMWH). Patients with a first episode of symptomatic unprovoked or provoked proximal DVT will received LMWHs for 6 months; RVT, ultrasonographically-detected, will be then assessed. Patients without RVT stop LMWH, whereas those with RVT will be randomized to either stop or continue OAT for additional 6 months. Patients were followed-up at least 1 year after anticoagulant discontinuation focusing on the study outcomes: occurrence of recurrent venous thromboembolism and major bleeding
Detailed Description

BACKGROUND. Currently there is no consensus on the optimal duration of antithrombotic therapy in cancer patients experiencing a first episode of deep vein thrombosis (DVT) of lower limbs. Recent guidelines suggest that patients with active cancer suffering of DVT of the lower limbs should be treated for at least six months with low molecular weight heparin (LMWH). However, although the current scheme for establishing the duration of LMWH and/or Oral Anticoagulants (OA) is based on the nature of index DVT (idiopathic or provoked), some new data starting to select other parameters to individualise this decision. The use of D-dimer has been proven to be effective for selecting OA duration but this information is valid only for non cancer patients with idiopathic DVT. Moreover, D-dimer does not seem reliable in patients with chronic condition (such as cancer).

Recently, the presence of a Residual Vein Thrombosis (RVT) has been found to be associated with an increased risk for recurrency (even in the contralateral leg or other venous sites) and it can establishes the optimal duration of anticoagulant. However, such information is not present in cancer patients, a population considered at high risk for recurrent thrombosis. To test this hypothesis, we planned a randomized study in cancer patients with a first episode of symptomatic idiopathic or provoked DVT treated with LMWH for 6 months. Patients without RVT will not continue anticoagulation (group B), whereas those with RVT will be randomized to either stop (group A2) or continue heparin (group A1).

METHODS Study patients. Cancer patients with a first episode of documented unprovoked and provoked proximal DVT will be eligible for the study if they had completed 6 months of LMWH (at therapeutic dosage for the first month, then dose reduced by 25% for the remaining 5 months). Provoked DVTs are defined as thrombotic episodes associated with pregnancy or puerperium, recent (i.e. within three months) fracture or plaster casting of a leg, immobilization with confinement to bed for three consecutive days and surgery with general anesthesia lasting longer than 30 minutes. Unprovoked DVTs are defined as thrombotic episodes occurred in apparently absence of risk factor other than cancer. Patients with known thrombophilia, serious liver disease, renal insufficiency (creatinine clearance < 30 ml/min.) or those who lived too far from the center will be excluded from the study. The study has to be approved by the institutional review boards of all participating centers. All enrolled patients will provide written informed consent.

STUDY DESIGN. This is a multicenter prospective study in cancer patients with a first episode of symptomatic (either provoked or idiopathic) proximal DVT detected by Compression UltraSonography (C-US) and receiving LMWH for 6 months. At this time, subjects who agreed to participate in the study have a physical examination to assess baseline clinical conditions and to exclude contraindications. C-US of the proximal deep vein system in both legs will be performed, measuring the diameters of any detectable thrombus in the Common Femoral Vein (CFV) and Popliteal Veins (PV). Images will be obtained in transverse section only. Lumen compressibility will be then evaluated on CFV and PV by gentle pressure of the probe, as previously described. Briefly, the major and the minor diameters of the vein segment are measured and recorded before and after compression. C-US findings are scored as "absence of RVT" when residual thrombus occupied, at maximum compressibility, less than 40% of the vein area. Patients without RVT will not continue anticoagulation, whereas those with RVT will be randomized to either stop or continue LMWH for additional 6 months. A different randomization sequence for each different study site is computer generated and encapsulated in a randomization computer program. The sequences are balanced by blocks of ten.

STUDY OUTCOMES AND FOLLOW-UP. From the assignment visit, patients will be followed up for at least one year after LMWH discontinuation; during the follow-up period, patients will be contacted by the clinical centers every 3 months. C-US will be performed only when recurrent symptomatic DVT is suspected. The study outcome is the composite of confirmed recurrent venous thromboembolism (including DVT and/or fatal or non-fatal pulmonary embolism) and major bleeding events from the index DVT to the last day of follow-up. In cases of suspected DVT recurrence the results of C-US will be compared with the previous examination. A diagnosis of recurrent venous thrombosis is made if a previously fully compressible segment (contralateral or ipsilateral) became incompressible. In absence of a previous normal C-US, DVT recurrence is diagnosed if a previously non-occlusive thrombus shifted to occlusive thrombus, provided the vein area before compression had increased by more than 50%); in undetermined cases, contrast venography will be performed. In patients with suspected pulmonary embolism, diagnosis of recurrence is based on objective algorithms using clinical probability, ventilation-perfusion lung scanning/helical computed tomography, C-US and/or D-dimer if indicated. The diagnosis of clinically relevant haemorrhage will be made in case of decrease of haemoglobin levels > 2.0 gr/dl, retroperitoneal, intracranial or life-threatening. Patients will be instructed to contact the clinical center immediately if symptoms developed suggestive of venous thromboembolism or bleeding. All suspected outcome events and all deaths will be evaluated by a central adjudication committee whose members were unaware of the name of the subject, the enrolling center, the C-US findings and the assigned group.

STATISTICAL ANALYSIS. The sample size has been calculated by considering, for the group with worst prognosis (being it A1, or A2 or B) an incidence of recurrent venous thromboembolism of 20%, and a percentage of complications of 5% in the group with the best prognosis. An overall sample size of 300 patients (100 for each study group) has been calculated to reach a power of 80% to document a difference of at least 15% in at least one of the different head-to-head comparisons, by using Bonferroni method to distribute type I error (0.05) among multiple comparisons. An interim analysis is planned after the inclusion of 200 patients. The chi square test and 95% confidence intervals will be used to evaluate the difference in recurrence of VTE or bleeding between groups. A multivariable analysis with logistic regression model will be performed to identify risk factors predictive for recurrence of VTE. The model of logistic regression will be applied for both possible categories of patients, those with idiopathic or post-operative DVT. The planned duration of the enrollment phase is 3 years.

Study Type  ICMJE Interventional
Study Phase  ICMJE Phase 4
Study Design  ICMJE Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Condition  ICMJE
  • Deep Vein Thrombosis
  • Cancer
Intervention  ICMJE Drug: low molecular weight heparin
LMWH were continued for additional 6 months after detection of residual vein thrombosis (6 months after the index deep vein thrombosis) in patients randomized to group A. LMWH are stopped in patients randomized to group B or in those patients without residual vein thrombosis after 6 months from the index DVT. Dosage of LMWH are 75% of the therapeutic dosage (almost 1 mg/Kg every 12 hours)
Study Arms  ICMJE Not Provided
Publications * Napolitano M, Saccullo G, Malato A, Sprini D, Ageno W, Imberti D, Mascheroni D, Bucherini E, Gallucci P, D'Alessio A, Prantera T, Spadaro P, Rotondo S, Di Micco P, Oriana V, Urbano O, Recchia F, Ghirarduzzi A, Lo Coco L, Mancuso S, Casuccio A, Rini GB, Siragusa S. Optimal duration of low molecular weight heparin for the treatment of cancer-related deep vein thrombosis: the Cancer-DACUS Study. J Clin Oncol. 2014 Nov 10;32(32):3607-12. doi: 10.1200/JCO.2013.51.7433. Epub 2014 Sep 29.

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Unknown status
Estimated Enrollment  ICMJE
 (submitted: March 20, 2007)
Original Enrollment  ICMJE Same as current
Estimated Study Completion Date  ICMJE March 2011
Estimated Primary Completion Date March 2009   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

Inclusion Criteria:

  • Cancer patients with a first episode of symptomatic proximal DVT of the lower limbs
  • No signs of unstable pulmonary embolism

Exclusion Criteria:

  • Indication to antithrombotic therapy/OAT for > 6 months (i.e. valvular prothesis, atrial fibrillation etc.)
  • Previous DVT/PE
  • Hypersensitivity to contrast media
  • Pregnancy
  • Life expectancy < 1 year
  • Patients who are unable to fulfill study requirements as for repeated clinical controls
Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 18 Years and older   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE Italy
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT00450645
Other Study ID Numbers  ICMJE 1/05
Has Data Monitoring Committee Yes
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement  ICMJE Not Provided
Responsible Party Sergio Siragusa, University Hospital of Palermo
Study Sponsor  ICMJE Azienda Ospedaliera Universitaria Policlinico
Collaborators  ICMJE Not Provided
Investigators  ICMJE
Study Chair: Sergio Siragusa, MD University Hospital of Palermo
PRS Account Azienda Ospedaliera Universitaria Policlinico
Verification Date March 2009

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP