Thrombotic PatientsSYTHROMNCT04539678
SYTHROM Cohort, Myeloproliferative Neoplasia With Normal CBC and Thrombotic Complications
An observational study of Thrombotic Patients and Diagnosis of Myeloproliferative Neoplasia, run by Nantes University Hospital at 1 site in France.
Trial summary
Among the etiologies of thrombosis, myeloproliferative neoplasia (MPN) is quite rare but should be investigated in case of thrombosis of atypical localization (digestive or cerebral) or in the context of recurrent idiopathic thrombosis in a young subject. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Thrombotic Patients, Diagnosis of Myeloproliferative Neoplasia, Impact of Treatment With Cytoreducing Agent
- How many people
- 253 participants
- Where
- 1 siteFrance
- Study dates
- 21 May 2019to 31 Dec 2023
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Thrombosis recurrence :treated and untreated patients with cytoreductive agents
Who may be able to join
- Adult ≥18 years old
- Diagnosis of a deep arterial or venous thrombotic event verified by imaging (Doppler or CT scan)
- Diagnosis of MPN with normal CBC according to WHO 2017 criteria characterized by the detection of a molecular abnormality JAK2V617F mutation (regardless of allelic load), CALR or MPL and/or a bone marrow biopsy with abnormalities in favor of MPN.
- Normal blood cell count not suggestive of polycythemia vera (hematocrit<48% and hemoglobin<16g/dL for women; hematocrit<49% and hemoglobin<16.5g/dL for men), essential thrombocythemia (platelets<450 G/L) nor myelofibrosis (white blood cell count<11 G/L, no anemia or erythromyelemia associated with splenomegaly) at the time of the thrombotic event.
Who cannot join
- Minors (<18 years of age)
- Microcirculation disorders (erythromelalgia, headaches, paresthesia, ischemia of the extremities)
- Superficial or deep arterial or venous thrombosis NOT verified by imaging
- Diagnosis or history of TE, PV or myelofibrosis at time of first thrombotic event
- Diagnosis of mixed myelodysplastic/myeloproliferative syndrome
- Diagnosis of unclassifiable MPN with excess blasts at the onset or signs of myelodysplasia as defined by the WHO 2017 classification
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Retrospective and Prospective Multicenter Study Evaluating the Impact of Treatment With Cytoreducing Agents on the Recurrence of Thrombosis in Thrombotic Patients With a Diagnosis of Myeloproliferative Neoplasia and Normal Blood Counts - a FIM Study
Among the etiologies of thrombosis, myeloproliferative neoplasia (MPN) is quite rare but should be investigated in case of thrombosis of atypical localization (digestive or cerebral) or in the context of recurrent idiopathic thrombosis in a young subject. Thrombosis could reveal an underlying MPN through the identification of a JAK2 V617F mutation. Rarely, MPN with thrombotic complications present with normal complete blood count(CBC). In case of a MPN with a thrombotic event but without CBC abnormality, anti-thrombotic treatment is recommended. But there is no recommendation for the indication of cytoreductive therapy and the clinician's decision is often empirical.
One of the major complications of for essential thrombocythemia (ET) or polycythemia vera (PV) is thrombosis and an age over 60 is a major risk factor. The treatment of thrombosis associated with TE or PV is based on recommendations the main therapeutic objective of which is to reduce the thrombotic risk. The combination of a cytoreducing agent and antithrombotic treatment is thus proposed in high-risk patients. The efficacy of this management is monitored by assessing CBC with the objective of normalization at <400 G/L of platelets for ET patients and <45% hematocrit in case of PV.
Read more
The absence of abnormal CBC makes it difficult to justify cytoreduction. The benefit of such a therapy in this context has not been clinically demonstrated. If a cytoreductive therapy is initiated, no biological parameters are available to assess the response to treatment.
The objective of this observational study is to evaluate the incidence of recurrence of thrombosis in patients whose thrombotic event revealed an underlying MPN with normal CBC. A comparison of groups treated or not with cytoreductive agents will be performed. Longitudinal monitoring of the patients will provide a better understanding of the nature and kinetics of hematological changes in these patients.
Read the detailed description
This study is observational and multicentric.In a first part, patients will be retrospectively included. Baseline clinical and biological data obtainedat the time of MPN diagnosis of MPN with normal CBC following venous or arterial thrombosis will be recorded and follow-up data will be collected in an e-CRF. In a second part, patients will be included prospectively and diagnostic and follow-up data will be collected. Whether or not to initiate treatment with a cytoreduction treatment is left to the discretion of the clinician.
- Conditions
- Thrombotic Patients, Diagnosis of Myeloproliferative Neoplasia, Impact of Treatment With Cytoreducing Agent
- Keywords
- Thrombosis, Myeloproliferative neoplasm, Hydroxyurea, Interferon
- Medical subject headings
- Thrombosis, Myeloproliferative Disorders
What is being measured
The primary outcome is the main question the study is designed to answer.
Cumulative incidence of recurrence of thromboembolic events after the initial thrombosis leading to the diagnosis of MPN
The diagnosis of thromboembolic events must be confirmed by imaging
Measured: 24 months follow-up
Secondary outcomes (2)
Cumulative incidence of hematological progression to essential thrombocythemia, polycythemia vera, secondary myelofibrosis or acute transformation
Hematological progression criteria will be based on the WHO classification
Measured: 24 months follow-up
Cumulative incidence of recurrence of thromboembolic events according to the type and duration of anticoagulant or anti-aggregant treatment
The diagnosis of thromboembolic event must be confirmed by imaging
Measured: 24 months follow-up
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted7 Sep 2020
- Study start21 May 2019
- Primary completion31 Dec 2023
- Study completion31 Dec 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for Thrombotic PatientsStudies of the same condition, open and under way.
- More trials run by Nantes University HospitalThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Retrospective
- Enrolment
- 253 participants (actual)
Sponsor and investigators
- Lead sponsor
- Nantes University Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- French Intergroup of Myeloproliferative syndromes
- Responsible party
- Sponsor
- Investigators
- Yannick LE BRIS, PhD, Principal investigator, Nantes University Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04539678
- Sponsor's protocol ID
- RC20_0141
- Acronym
- SYTHROM
- Status last verified
- Feb 2025
- First submitted
- 31 Aug 2020
- Last updated
- 21 Feb 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Kiladjian JJ, Cervantes F, Leebeek FW, Marzac C, Cassinat B, Chevret S, Cazals-Hatem D, Plessier A, Garcia-Pagan JC, Darwish Murad S, Raffa S, Janssen HL, Gardin C, Cereja S, Tonetti C, Giraudier S, Condat B, Casadevall N, Fenaux P, Valla DC. The impact of JAK2 and MPL mutations on diagnosis and prognosis of splanchnic vein thrombosis: a report on 241 cases. Blood. 2008 May 15;111(10):4922-9. doi: 10.1182/blood-2007-11-125328. Epub 2008 Feb 4.
PubMed 18250227De Stefano V, Fiorini A, Rossi E, Za T, Farina G, Chiusolo P, Sica S, Leone G. Incidence of the JAK2 V617F mutation among patients with splanchnic or cerebral venous thrombosis and without overt chronic myeloproliferative disorders. J Thromb Haemost. 2007 Apr;5(4):708-14. doi: 10.1111/j.1538-7836.2007.02424.x. Epub 2007 Jan 29.
PubMed 17263783Levraut M, Legros L, Drappier C, Bene MC, Queyrel V, Raynaud S, Martis N. Low prevalence of JAK2 V617F mutation in patients with thrombosis and normal blood counts: a retrospective impact study. J Thromb Thrombolysis. 2020 Nov;50(4):995-1003. doi: 10.1007/s11239-020-02100-z.
PubMed 32266587Barbui T, Thiele J, Passamonti F, Rumi E, Boveri E, Ruggeri M, Rodeghiero F, d'Amore ES, Randi ML, Bertozzi I, Marino F, Vannucchi AM, Antonioli E, Carrai V, Gisslinger H, Buxhofer-Ausch V, Mullauer L, Carobbio A, Gianatti A, Gangat N, Hanson CA, Tefferi A. Survival and disease progression in essential thrombocythemia are significantly influenced by accurate morphologic diagnosis: an international study. J Clin Oncol. 2011 Aug 10;29(23):3179-84. doi: 10.1200/JCO.2010.34.5298. Epub 2011 Jul 11.
PubMed 21747083Barbui T, Finazzi G, Carobbio A, Thiele J, Passamonti F, Rumi E, Ruggeri M, Rodeghiero F, Randi ML, Bertozzi I, Gisslinger H, Buxhofer-Ausch V, De Stefano V, Betti S, Rambaldi A, Vannucchi AM, Tefferi A. Development and validation of an International Prognostic Score of thrombosis in World Health Organization-essential thrombocythemia (IPSET-thrombosis). Blood. 2012 Dec 20;120(26):5128-33; quiz 5252. doi: 10.1182/blood-2012-07-444067. Epub 2012 Oct 1.
PubMed 23033268Pearson TC, Wetherley-Mein G. Vascular occlusive episodes and venous haematocrit in primary proliferative polycythaemia. Lancet. 1978 Dec 9;2(8102):1219-22. doi: 10.1016/s0140-6736(78)92098-6.
PubMed 82733Barosi G, Birgegard G, Finazzi G, Griesshammer M, Harrison C, Hasselbalch HC, Kiladjian JJ, Lengfelder E, McMullin MF, Passamonti F, Reilly JT, Vannucchi AM, Barbui T. Response criteria for essential thrombocythemia and polycythemia vera: result of a European LeukemiaNet consensus conference. Blood. 2009 May 14;113(20):4829-33. doi: 10.1182/blood-2008-09-176818. Epub 2009 Mar 10.
PubMed 19278953
Study at a glance
From the registry record, last updated by the sponsor on 21 Feb 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Retrospective and Prospective Multicenter Study Evaluating the Impact of Treatment With Cytoreducing Agents on the Recurrence of Thrombosis in Thrombotic Patients With a Diagnosis of Myeloproliferative Neoplasia and Normal Blood Counts - a FIM Study
- ClinicalTrials.gov ID
- NCT04539678
- Acronym / sponsor ID
- SYTHROM / RC20_0141
- Conditions
- Thrombotic Patients, Diagnosis of Myeloproliferative Neoplasia, Impact of Treatment With Cytoreducing Agent
- Keywords
- Thrombosis, Myeloproliferative neoplasm, Hydroxyurea, Interferon
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 253 participants (actual)
- Lead sponsor
- Nantes University HospitalUniversity, hospital or other
- Collaborators
- French Intergroup of Myeloproliferative syndromes
- Study start
- 21 May 2019 (actual)
- Primary completion
- 31 Dec 2023 (actual)
- Study completion
- 31 Dec 2023 (actual)
- First posted
- 7 Sep 2020 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Among the etiologies of thrombosis, myeloproliferative neoplasia (MPN) is quite rare but should be investigated in case of thrombosis of atypical localization (digestive or cerebral) or in the context of recurrent idiopathic thrombosis in a young subject. Thrombosis could reveal an underlying MPN through the identification of a JAK2 V617F mutation. Rarely, MPN with thrombotic complications present with normal complete blood count(CBC). In case of a MPN with a thrombotic event but without CBC abnormality, anti-thrombotic treatment is recommended. But there is no recommendation for the indication of cytoreductive therapy and the clinician's decision is often empirical.
One of the major complications of for essential thrombocythemia (ET) or polycythemia vera (PV) is thrombosis and an age over 60 is a major risk factor. The treatment of thrombosis associated with TE or PV is based on recommendations the main therapeutic objective of which is to reduce the thrombotic risk. The combination of a cytoreducing agent and antithrombotic treatment is thus proposed in high-risk patients. The efficacy of this management is monitored by assessing CBC with the objective of normalization at <400 G/L of platelets for ET patients and <45% hematocrit in case of PV.
The absence of abnormal CBC makes it difficult to justify cytoreduction. The benefit of such a therapy in this context has not been clinically demonstrated. If a cytoreductive therapy is initiated, no biological parameters are available to assess the response to treatment.
The objective of this observational study is to evaluate the incidence of recurrence of thrombosis in patients whose thrombotic event revealed an underlying MPN with normal CBC. A comparison of groups treated or not with cytoreductive agents will be performed. Longitudinal monitoring of the patients will provide a better understanding of the nature and kinetics of hematological changes in these patients.
Detailed description
This study is observational and multicentric.In a first part, patients will be retrospectively included. Baseline clinical and biological data obtainedat the time of MPN diagnosis of MPN with normal CBC following venous or arterial thrombosis will be recorded and follow-up data will be collected in an e-CRF. In a second part, patients will be included prospectively and diagnostic and follow-up data will be collected. Whether or not to initiate treatment with a cytoreduction treatment is left to the discretion of the clinician.
Study design
- Observational model
- Cohort
- Time perspective
- Retrospective
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Thrombosis recurrence :treated and untreated patients with cytoreductive agents
Key inclusion criteria (4 listed)
- Adult ≥18 years old
- Diagnosis of a deep arterial or venous thrombotic event verified by imaging (Doppler or CT scan)
- Diagnosis of MPN with normal CBC according to WHO 2017 criteria characterized by the detection of a molecular abnormality JAK2V617F mutation (regardless of allelic load), CALR or MPL and/or a bone marrow biopsy with abnormalities in favor of MPN.
- Normal blood cell count not suggestive of polycythemia vera (hematocrit<48% and hemoglobin<16g/dL for women; hematocrit<49% and hemoglobin<16.5g/dL for men), essential thrombocythemia (platelets<450 G/L) nor myelofibrosis (white blood cell count<11 G/L, no anemia or erythromyelemia associated with splenomegaly) at the time of the thrombotic event.
Key exclusion criteria (6 listed)
- Minors (<18 years of age)
- Microcirculation disorders (erythromelalgia, headaches, paresthesia, ischemia of the extremities)
- Superficial or deep arterial or venous thrombosis NOT verified by imaging
- Diagnosis or history of TE, PV or myelofibrosis at time of first thrombotic event
- Diagnosis of mixed myelodysplastic/myeloproliferative syndrome
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Cumulative incidence of recurrence of thromboembolic events after the initial thrombosis leading to the diagnosis of MPN
Time frame: 24 months follow-up
The diagnosis of thromboembolic events must be confirmed by imaging
2 secondary outcomes
Cumulative incidence of hematological progression to essential thrombocythemia, polycythemia vera, secondary myelofibrosis or acute transformation
Time frame: 24 months follow-up
Cumulative incidence of recurrence of thromboembolic events according to the type and duration of anticoagulant or anti-aggregant treatment
Time frame: 24 months follow-up
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Feb 2025.
- Background: PubMed 18250227Kiladjian JJ, Cervantes F, Leebeek FW, Marzac C, Cassinat B, Chevret S, Cazals-Hatem D, Plessier A, Garcia-Pagan JC, Darwish Murad S, Raffa S, Janssen HL, Gardin C, Cereja S, Tonetti C, Giraudier S, Condat B, Casadevall N, Fenaux P, Valla DC. The impact of JAK2 and MPL mutations on diagnosis and prognosis of splanchnic vein thrombosis: a report on 241 cases. Blood. 2008 May 15;111(10):4922-9. doi: 10.1182/blood-2007-11-125328. Epub 2008 Feb 4.
- Background: PubMed 17263783De Stefano V, Fiorini A, Rossi E, Za T, Farina G, Chiusolo P, Sica S, Leone G. Incidence of the JAK2 V617F mutation among patients with splanchnic or cerebral venous thrombosis and without overt chronic myeloproliferative disorders. J Thromb Haemost. 2007 Apr;5(4):708-14. doi: 10.1111/j.1538-7836.2007.02424.x. Epub 2007 Jan 29.
- Background: PubMed 32266587Levraut M, Legros L, Drappier C, Bene MC, Queyrel V, Raynaud S, Martis N. Low prevalence of JAK2 V617F mutation in patients with thrombosis and normal blood counts: a retrospective impact study. J Thromb Thrombolysis. 2020 Nov;50(4):995-1003. doi: 10.1007/s11239-020-02100-z.
- Background: PubMed 21747083Barbui T, Thiele J, Passamonti F, Rumi E, Boveri E, Ruggeri M, Rodeghiero F, d'Amore ES, Randi ML, Bertozzi I, Marino F, Vannucchi AM, Antonioli E, Carrai V, Gisslinger H, Buxhofer-Ausch V, Mullauer L, Carobbio A, Gianatti A, Gangat N, Hanson CA, Tefferi A. Survival and disease progression in essential thrombocythemia are significantly influenced by accurate morphologic diagnosis: an international study. J Clin Oncol. 2011 Aug 10;29(23):3179-84. doi: 10.1200/JCO.2010.34.5298. Epub 2011 Jul 11.
- Background: PubMed 23033268Barbui T, Finazzi G, Carobbio A, Thiele J, Passamonti F, Rumi E, Ruggeri M, Rodeghiero F, Randi ML, Bertozzi I, Gisslinger H, Buxhofer-Ausch V, De Stefano V, Betti S, Rambaldi A, Vannucchi AM, Tefferi A. Development and validation of an International Prognostic Score of thrombosis in World Health Organization-essential thrombocythemia (IPSET-thrombosis). Blood. 2012 Dec 20;120(26):5128-33; quiz 5252. doi: 10.1182/blood-2012-07-444067. Epub 2012 Oct 1.
- Background: PubMed 82733Pearson TC, Wetherley-Mein G. Vascular occlusive episodes and venous haematocrit in primary proliferative polycythaemia. Lancet. 1978 Dec 9;2(8102):1219-22. doi: 10.1016/s0140-6736(78)92098-6.
- Background: PubMed 19278953Barosi G, Birgegard G, Finazzi G, Griesshammer M, Harrison C, Hasselbalch HC, Kiladjian JJ, Lengfelder E, McMullin MF, Passamonti F, Reilly JT, Vannucchi AM, Barbui T. Response criteria for essential thrombocythemia and polycythemia vera: result of a European LeukemiaNet consensus conference. Blood. 2009 May 14;113(20):4829-33. doi: 10.1182/blood-2008-09-176818. Epub 2009 Mar 10.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Yannick LE BRIS, PhD principal investigator
Nantes University Hospital
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Thrombotic Patients and Diagnosis of Myeloproliferative Neoplasia, run by Nantes University Hospital at 1 site in France.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Feb 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Cumulative incidence of recurrence of thromboembolic events after the initial thrombosis leading to the diagnosis of MPN (time frame: 24 months follow-up). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT04539678, which also lists 7 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Feb 2025.