Philadelphia-negative myeloproliferative neoplasms (MPN) are frequent and chronic myeloid malignancies including Polycythemia Vera (PV), essential thrombocythemia (ET), Primary Myelofibrosis (PMF) and Prefibrotic myelofibrosis (PreMF). These MPNs are caused by the acquisition of mutations affecting activation/proliferation pathways in hematopoietic stem cells. The principal mutations are JAK2V617F, calreticulin (CALR exon 9) and MPL W515. ET or MFP/PreMF patients who do not carry one of these three mutations are declared as triple-negative (3NEG) cases even if they are real MPN cases.

These diseases are at high risk of thrombo-embolic complications and with high morbidity/mortality. This risk varies from 4 to 30% depending on MPN subtype and mutational status.

In terms of therapy, all patients with MPNs should also take daily low-dose aspirin (LDA) as first antithrombotic drug, which is particularly efficient to reduce arterial but not venous events.

Despite the association of a cytoreductive drug and LDA, thromboses still occur in 5-8% patients/year.

All these situations have been explored in biological or clinical assays. All of them could increase the bleeding risk. We should look at different ways to reduce the thrombotic incidence: Direct Oral Anticoagulants (DOAC)? In the general population, in medical or surgical contexts, DOACs have demonstrated their efficiency to prevent or cure most of the venous or arterial thrombotic events.

At the present time, DOAC can be used in cancer populations according to International Society on Thrombosis and Haemostasis (ISTH) recommendations, except in patients with cancer at high bleeding risk (gastro-intestinal or genito-urinary cancers). Unfortunately, in trials evaluating DOAC in cancer patients, most patients have solid rather than hematologic cancers (generally less than 10% of the patients, mostly lymphoma or myeloma).

In cancer patients, DOAC are also highly efficient to reduce the incidence of thrombosis (-30 to 60%), but patients are exposed to a higher hemorrhagic risk, especially in digestive cancer patients.

In the cancer population, pathophysiology of both thrombotic and hemorrhagic events may be quite different between solid cancers and MPN. If MPN patients are also considered to be cancer patients in many countries, the pathophysiology of thrombosis is quite specific (hyperviscosity, platelet abnormalities, clonality, specific cytokines…) and they are exposed to a lower risk of digestive hemorrhages. It is thus difficult to extend findings from the "general cancer population" to MPN patients.

Unfortunately, only scarce, retrospective data regarding the use of DOAC in MPNs are available data.

We were the first to publish a "real-life" study about the use, the impact, and the risks in this population. In this local retrospective study, 25 patients with MPN were treated with DOAC for a median time of 2.1 years. We observed only one thrombosis (4%) and three major hemorrhages (12%, after trauma or unprepared surgery). Furthermore, we have compared the benefit/risk balance compared to patients treated with LDA without difference.

With the increasing evidences of efficacy and tolerance of DOAC in large cohorts of patients including cancer patients, with their proven efficacy on prevention of both arterial and venous thrombotic events and because of the absence of prospective trial using these drugs in MPN patients, we propose to study their potential benefit as primary thrombotic prevention in MPN.

Inclusion Criteria:

• Patients with diagnosis of PV or ET or PreMF according to WHO or BSCH criteria (bone marrow biopsy not compulsory).

• Patients with JAK2V617F mutation (threshold allele burden > 1%).

• Patients considered as "high-risk" patients:

  1. based on age (> 60-year-old)
  2. based on thrombotic history (compatible with antithrombotic randomization) but aged ≥ 18-year-old.

• Length of time from MPN diagnostic to inclusion will not exceed 12 months.

Exclusion Criteria:

• Contra-indication to aspirin or DOAC due to allergic situation or recent history of major bleeding.
• Formal indication of treatment with aspirin or DOAC (thus precluding randomization).
• Inability to give informed consent.
• Patients under curatorship/guardianship
• Concomitant use of a strong inhibitor or inducer of CYP3A4 (like ruxolitinib).
• Chronic liver disease or chronic hepatitis.
• Renal insufficiency with creatinine <30 ml/mn on Cockcroft and Gault Formula
• Patient considered at high-risk of bleeding: patients with current or recent major or clinical relevant non major bleeding gastrointestinal or cerebral bleedings
• Planned pregnancy within 24 months
• No appropriate contraception (estrogen contraception or no contraception) in women of childbearing age or breastfeeding woman
• PS>2 or life expectancy <12 months.

All collected data that underlie results in a publication

Data will be available beginning five years and ending fifteen years following the final study report completion.

Data access requests will be reviewed by the internal committee of Brest UH. Requestors will be required to sign and complete a data access agreement.