Hydroxyurea Versus Aspirin and Hydroxyurea in Essential Thrombocythemia — FAST  

Essential Thrombocythemia Clinical Trial

Official title: French Aspirin Study in Essential Thrombocythemia: an Open and Randomized Study

Status Recruiting

Clinical Trial Summary

The hypothesis is that efficient prevention of thrombosis with aspirin at diagnosis becomes less useful once patients have achieved a hematologic response (HR) (modified by amendment 1/03/2017) and/or that this benefit is hampered by an increased hemorrhagic risk especially in elderly patients.

Hence, investigator propose a prospective randomized study to assess the benefit / risk ratio of aspirin maintenance in high risk Essential thrombocythemia (ET) patients, in hematological response (modified by amendment 1/03/2017) on Hydroxyurea.

Clinical Trial Description

ET is a myeloproliferative neoplasm (MPN) characterized by a high platelet level. Increased occurrence of thrombosis and hemorrhages are the main complications in ET. In this regard, the key factors defining high risk ET include age over 60 years, past history of thrombosis, platelet > 1500 109/L and to a lesser degree cardiovascular risk factors. These criteria currently serve as therapeutic guidelines for the use of cytoreductive therapy, with hydroxyurea (HU) being the treatment of choice in the first line setting.

The use of antiplatelet agent i.e. low-dose aspirin is also generally recommended. However, the benefit of aspirin has never been formally demonstrated in ET. Only indirect evidence come from the ECLAP study that enrolled patients with polycythemia vera (PV). Of note in the ECLAP study, the efficacy of aspirin was assessed only at diagnosis but not correlated thereafter with the hematological response on cytoreductive therapy.

In general non-MPN population studies, primary prophylaxis with aspirin has been associated with a risk reduction of major vascular events, but an increased risk of hemorrhage, especially considering age and prior gastrointestinal history. In a recent retrospective study, the combination of aspirin and cytoreduction was reported to prevent thrombosis but concomitantly increase the bleeding risk when compared to HU alone , especially in patients older than 60 years, thus questioning the benefits of long term use of aspirin therapy. These data raise the question of the actual benefit of aspirin maintenance, once patients have been efficiently treated with cytoreductive therapy.

Hence, investigator propose a prospective randomized study to assess the benefit / risk ratio of aspirin maintenance in high risk ET patients, in hematological response (modified by amendment 1/03/2017) on Hydroxyurea. Patients for which Aspirin interruption will not be possible because of extra-ET indications will be enrolled in the control observational arm. ;

Related Conditions & MeSH terms

• Essential Thrombocythemia
• MPN
• Thrombocythemia, Essential
• Thrombocytosis

• NCT number: NCT02611973
• Study type: Interventional
• Source: Assistance Publique - Hôpitaux de Paris
• Contact: Stéphane Giraudier, MD, PhD
• Phone: (0)149812880
• Email: stephane.giraudier@aphp.fr
• Status: Recruiting
• Phase: Phase 3
• Start date: March 10, 2016
• Completion date: November 2022