The API-CALF Study: Apixaban to Treat Calf Vein Thrombosis

Обзор

Isolated distal DVT (iDDVT) is the most frequent clinical presentation of VTE and is associated with a significant morbidity and risks of long-term complications. Data from clinical trials highlighted that patients with iDDVT might require some level of AC treatment. However, the optimal anticoagulant intensity is uncertain, and it is plausible that the best benefit/risk ratio for AC might be achieved with lower intensity doses rather than therapeutic doses. The principal research question of the Apixaban to treat calf vein thrombosis (API-CALF) study is to determine whether, after a conventional course of 7 days of Apixaban 10mg BID, Apixaban 2.5mg BID (experimental arm) is non inferior to Apixaban 5 mg BID (standard arm) in preventing VTE recurrence and bleeding in patients with iDDVT. Patients will be treated with Apixaban for a total of 3 months. In that perspective we will conduct an international multicentre open-label assessor-blinded study

Подробное описание

Isolated distal deep vein thrombosis (iDDVT) is an infra-popliteal DVT, without concomitant proximal DVT and without pulmonary embolism (PE). Until recently, few large studies have focused on iDDVT, and the clinical significance and therapeutic management of iDDVT was mostly based on expert opinion and "gestalt" rather than on strong scientific data. iDDVT is the most frequent presentation of venous thromboembolic disease (VTE). Indeed, in the large French, multicentre, observational, OPTIMEV study, where all patients with suspected DVT underwent systematic whole leg compression ultrasound (CUS) exploration, iDDVT represented 56% of all DVTs. A similar high proportion of distal DVT among DVT (52.1%) was reported in Johnson's meta-analysis.

The risk of proximal extension of iDDVT to the proximal veins is substantial. In an extensive review of the literature published 15 years ago, the investigators reported that the risk of proximal extension of iDDVT, whether treated or left untreated, ranged from 0-44%, underlining the heterogeneity of the available data. Data from the CALTHRO study and CACTUS trial and extrapolation of data from management studies comparing the safety of serial proximal CUS vs. whole leg CUS for DVT diagnosis suggest that the rate of extension of untreated iDDVT to proximal deep veins was \~ 10% and up to 28% in high-risk populations, such as patients with cancer (3, 7-9). This 10% average risk of proximal extension is far above the usual 2% cut-off for an acceptable false-negative rate for negative findings in DVT diagnostic strategies. Hence, from a strict natural history standpoint, clinical significance of iDDVT is no longer in question. In summary, iDDVT is the most frequent clinical presentation of VTE and patients with iDDVT are at significant risk of proximal extension and of adverse outcomes both in the short and in the long-term.

Management of iDDVT is one of the most debated issue in the field of VTE. Thus, in all trials that validated the use of DOAC, distal location of DVT was an exclusion criterion.

While the American society of Hematology (ASH) guidelines do not comment on iDDVT specific treatment, the American college of chest physicians (ACCP) guidelines state that only 'high risk' distal DVT should be systematically treated with anticoagulation. Non high risk iDDVT could benefit from surveillance by repeated CUS. However, in the international CACTUS study, the investigators observed that a primary reason for refusal of participation and failure to fulfil recruitment was that patients and their treating physicians refused that iDDVT be left untreated. In routine clinical practice, data from observational registries showed that the majority iDDVT are treated with full dose of anticoagulants: 97% of iDDVT in the French OPTIMEV study, 98% in the Italian MASTER registry and 99% in the international RIETE registry. These therapeutic attitudes reflect physicians' beliefs (and patients' preference) that anticoagulation is important in case of iDDVT.

For proximal DVT and PE, "therapeutic" doses of anticoagulants are prescribed as use of lower doses was associated with an unacceptably high VTE risk. In contrast, for superficial vein thrombosis (SVT), "prophylactic" doses (fondaparinux 2.5mg or rivaroxaban 10 mg daily) were shown to be very effective and associated with a very low bleeding risk. Regarding iDDVT, risk of VTE recurrence and effectiveness of different dose regimen of anticoagulation are less clear and literature suggests that it could depend on patients' characteristics . Based on literature review, main risk factors for VTE extension/recurrence include cancer, calf trifurcation involvement, previous VTE, unprovoked character of DVT or presence of a permanent risk factor, and multiple vein distal vein thromboses.

In the CACTUS study, at 3 months, the proportion of extension to proximal deep veins in the therapeutic anticoagulation arm was lower than in the placebo arm (3.3% vs. 6.2% at 3 months; p=NS), but the risk of significant bleeding was significantly higher (4.1% vs. 0.0%)(3). Namely, in CACTUS, the benefit of therapeutic anticoagulation in terms of VTE risk reduction was offset by the excess in risk of bleeding.

In summary, iDDVT is the most frequent clinical presentation of VTE and is associated with a significant morbidity and risks of long-term complications. Data from clinical trials highlighted that patients with iDDVT might require some level of AC treatment. However, the optimal anticoagulant intensity is uncertain, and it is plausible that the best benefit/risk ratio for AC might be achieved with lower intensity doses rather than therapeutic doses.

The principal research question of the Apixaban to treat calf vein thrombosis (API-CALF) study is to determine whether, after a conventional course of 7 days of Apixaban 10mg BID, Apixaban 2.5mg BID (experimental arm) is non inferior to Apixaban 5 mg BID (standard arm) in preventing VTE recurrence and bleeding in patients with iDDVT. Patients will be treated with Apixaban for a total of 3 months. In that perspective we will conduct an international multicentre open-label assessor-blinded study

Вмешательства

• Препарат Apixaban 2.5 MG Oral Tablet [ELIQUIS]
  Apixaban 5 MG BID versus Apixaban 2.5 MG BID

Первичные конечные точки

• Rate of i) symptomatic VTE; ii) major bleeding and clinically relevant non major bleeding (CRNMB); iii) VTE and bleeding related death. [Срок оценки: 1 year]

Вторичные конечные точки (5)

• Individual components of the composite endpoint at 3 months and 1 year - Generic and venous disease-specific QOL scores at 1 year - Patient's compliance with treatment at 3 months - Serious adverse events during follow-up - PTS as measured at 1 year [Срок оценки: 1 year]
• Generic and venous disease-specific QOL scores at 1 year [Срок оценки: 1 year]
• Patient's observance with treatment at 3 months [Срок оценки: 3 months]
• Serious adverse events during follow-up [Срок оценки: 1 year]
• PTS as measured at 1 year [Срок оценки: 1 year]

Критерии участия

Критерии включения

Consecutive patients with acute (symptoms <10 days) symptomatic iDDVT diagnosed on leg CUS who have none of the following exclusion criteria and who provided informed consent to participate. Diagnosis of iDDVT is made in the presence of an incompressible distal deep vein (deep calf vein (posterior tibial, anterior tibial or peroneal veins) or muscular vein (soleal or gastrocnemius veins)).

Критерии исключения

• Age < 18 years
• Ipsi or contralateral Proximal DVT
• Distal DVT involving the tibio-peroneal trunk (i.e. calf trifurcation)
• DVT occurring while on anticoagulation (started ≥48hours before DVT diagnosis); However, inpatients that developed their iDDVT while on prophylactic anticoagulation are eligible if their expected date of discharge is <6 days post randomization.
• Clinically suspected PE (patient eligible if PE ruled out with objective tests)
• Active cancer, receiving cancer treatment or cured for < 6 months
• Indication for long-term therapeutic anticoagulation (e.g. atrial fibrillation, mechanical heart valve…)
• Thrombocytopenia (platelet count <100 g/l)
• Severe renal impairment (creatinine clearance <30 ml/min)
• Liver disease (including Child-Pugh Class B and C) associated with coagulopathy
• Pregnant or breast-feeding woman
• Body weight >120kg or <40 kg
• Ongoing active bleeding or condition at high risk of bleeding with anticoagulation (e.g. peptic ulcer…)
• Treatment with daily NSAIDs (aspirin ≤160 mg/day or clopidogrel ≤75 mg day permitted)
• Allergy to Apixaban
• Use of concomitant drugs that significantly interact with Apixaban: strong inhibitors of P-gp and CYP3A4 or strong inducers of CYP3A4
• Treatment with anticoagulants at therapeutic dose >2 days after DVT diagnosis
• Life expectancy < 1 year
• Enrolled in another clinical trial within previous 30 days
• Inability or refusal to provide informed consent

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Нет

Дизайн исследования

Распределение

Рандомизированное

Модель

Параллельные группы

Маскирование

Простое слепое

Основная цель

Лечение

Центры проведения

Список центров уточняется — проверьте первичный протокол.

Публикации

• Galanaud JP, Bosson JL, Quere I. Risk factors and early outcomes of patients with symptomatic distal vs. proximal deep-vein thrombosis. Curr Opin Pulm Med. 2011 Sep;17(5):387-91. doi: 10.1097/MCP.0b013e328349a9e3. PMID 21832920
• Schellong SM. Distal DVT: worth diagnosing? Yes. J Thromb Haemost. 2007 Jul;5 Suppl 1:51-4. doi: 10.1111/j.1538-7836.2007.02490.x. PMID 17635708
• Righini M, Galanaud JP, Guenneguez H, Brisot D, Diard A, Faisse P, Barrellier MT, Hamel-Desnos C, Jurus C, Pichot O, Martin M, Mazzolai L, Choquenet C, Accassat S, Robert-Ebadi H, Carrier M, Le Gal G, Mermilllod B, Laroche JP, Bounameaux H, Perrier A, Kahn SR, Quere I. Anticoagulant therapy for symptomatic calf deep vein thrombosis (CACTUS): a randomised, double-blind, placebo-controlled trial. La PMID 27836513
• Galanaud JP, Sevestre-Pietri MA, Bosson JL, Laroche JP, Righini M, Brisot D, Boge G, van Kien AK, Gattolliat O, Bettarel-Binon C, Gris JC, Genty C, Quere I; OPTIMEV-SFMV Investigators. Comparative study on risk factors and early outcome of symptomatic distal versus proximal deep vein thrombosis: results from the OPTIMEV study. Thromb Haemost. 2009 Sep;102(3):493-500. doi: 10.1160/TH09-01-0053. PMID 19718469
• Johnson SA, Stevens SM, Woller SC, Lake E, Donadini M, Cheng J, Labarere J, Douketis JD. Risk of deep vein thrombosis following a single negative whole-leg compression ultrasound: a systematic review and meta-analysis. JAMA. 2010 Feb 3;303(5):438-45. doi: 10.1001/jama.2010.43. PMID 20124539
• Righini M, Bounameaux H. Clinical relevance of distal deep vein thrombosis. Curr Opin Pulm Med. 2008 Sep;14(5):408-13. doi: 10.1097/MCP.0b013e32830460ea. PMID 18664970
• Palareti G, Cosmi B, Lessiani G, Rodorigo G, Guazzaloca G, Brusi C, Valdre L, Conti E, Sartori M, Legnani C. Evolution of untreated calf deep-vein thrombosis in high risk symptomatic outpatients: the blind, prospective CALTHRO study. Thromb Haemost. 2010 Nov;104(5):1063-70. doi: 10.1160/TH10-06-0351. Epub 2010 Aug 5. PMID 20694281
• Bernardi E, Camporese G, Buller HR, Siragusa S, Imberti D, Berchio A, Ghirarduzzi A, Verlato F, Anastasio R, Prati C, Piccioli A, Pesavento R, Bova C, Maltempi P, Zanatta N, Cogo A, Cappelli R, Bucherini E, Cuppini S, Noventa F, Prandoni P; Erasmus Study Group. Serial 2-point ultrasonography plus D-dimer vs whole-leg color-coded Doppler ultrasonography for diagnosing suspected symptomatic deep vei PMID 18840838

Идентификаторы

NCT: NCT04981327 · APICALF

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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