Myeloproliferative NeoplasmIFN&SMPNCT05850273
Mechanism of Action of Interferon in the Treatment of Myeloproliferative Neoplasms
An observational study of Myeloproliferative Neoplasm, run by Institut National de la Santé Et de la Recherche Médicale, France at 1 site in France.
Trial summary
Classical BCR-ABL-negative myeloproliferative neoplasms (MPN) include: Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). They are myeloid malignancies resulting from the transformation of a multipotent hematopoietic stem cell (HSC) caused by mutations activating the JAK2/STAT… Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Myeloproliferative Neoplasm
- How many people
- 80 participants
- Where
- 1 siteFrance
- Study dates
- 16 Mar 2023to 16 Mar 2033
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
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: The studied population will be all men and women of legal age who were not vulnerable and whose diagnosis of MPN had been previously established by the referring physician. They are therefore voluntary patients of legal age who are not vulnerable and who suffer from PV, ET or MF. The selection of patients is according to the availability of the caregivers for this study but with a preference for this second study towards CALRm patients (rarer) rather than JAK2V617F. Our wish is to integrate a maximum of 50 patients (10/year) knowing that the limitation is the capacity (personnel and finance) of our INSERM laboratory to study this high number of patients.
Who may be able to join
- Adult male or female 18 years of age or older
- Diagnosis of MPN has been previously established by the referring physician and that physician will have decided to treat with pegylated IFN. Patients will be treated or untreated at the time of inclusion and may be newly diagnosed patients.
- These patients will be affiliated with or benefit from a social security plan
- For all these patients an additional 20-40 mL will be collected except for some PV patients who are treated conventionally by phlebotomy. In this case, we will collect blood bags from these patients. The volumes vary between 300 and 450 mL of blood depending on the weight and size of the patients.
- We will also include in this protocol any patient whose MPN, either PV, TE or MF, will have progressed to acute leukemia (AL) during treatment. These will be patients with AP of MPN (MPN can also progress to acute myeloid leukemia (AML) by acute transformation (AT) of MPN).
- Patient with signed informed consent
Who cannot join
- The non-inclusion criterion concerns the anemia that some MF patients may suffer from. Therefore, patients with anemia (Hb<10g) or transfusion dependency (≥ 1 packed red blood cell per month) at the time of the referral monitoring visit are not included in the research.
- Persons under court protection, guardianship or curatorship
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Léa Durix, MD,PhD contact
France1 site, 1 recruiting
- Recruiting
Inserm U1287
Villejuif, Île-de-France Region, 94805
Isabelle Plo, PhD, +33 1 42 11 54 93, isabelle.plo@gustaveroussy.fr
Léa Durix, +33 1 42 11 54 93, lea.durix@gustaveroussy.fr
About this study
Classical BCR-ABL-negative myeloproliferative neoplasms (MPN) include: Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). They are myeloid malignancies resulting from the transformation of a multipotent hematopoietic stem cell (HSC) caused by mutations activating the JAK2/STAT pathway. The most prevalent mutation is JAK2V617F. Type 1 and Type 2 calreticulin (CALR) and thrombopoietin receptor (MPL) mutations are also observed in ET and PMF. Additional non-MPN mutations affecting different pathways are also found, particularly in PMF, and are involved in disease initiation and/or in phenotypic changes and /or disease progression and/or response to therapy.
There is an obvious and urgent need for an efficient therapy for MPN. In particular, PMF remain without curative treatment, except allogeneic HSC transplantation and JAK inhibitors have limited effects on the disease outcome. Among novel therapeutic approaches, Peg-IFNα2a (IFN) is the most efficient harboring both high rates of hematological responses in JAK2V617F and CALRmut MPN patients and some molecular responses mainly in JAK2V617F patients including deep molecular response (DMR). Nevertheless, several studies, including our own, have demonstrated that the IFN molecular response in CALRmut patients is heterogeneous and overall much lower than in JAK2V617F patients. Moreover, some JAK2V617F MPN patients do not respond to IFN, and DMR is only observed in around 20% of JAK2V617F patients. Finally, long-term treatments are needed (2-5 years) to obtain a DMR, jeopardizing its success due to possible long-term toxicity.
Read more
The underlying reasons for failure, drug resistance, heterogeneous molecular response in CALRmut patients and the long delays for DMR in JAK2V617F patients remain unclear, largely because the mechanisms by which IFNα targets MPN malignant clones remain elusive.
Significant improvement of IFN efficacy cannot be achieved without basic and clinical research. Hence our two lines of research are to
- Understand how IFNα specifically targets neoplastic HSCs
- Predicting and improving patient response during IFNα therapy
Read the detailed description
Classical BCR-ABL-negative myeloproliferative neoplasms (MPN) include: Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). They are myeloid malignancies resulting from the transformation of a multipotent hematopoietic stem cell (HSC) caused by mutations activating the JAK2/STAT pathway. The most prevalent mutation is JAK2V617F. Type 1 and Type 2 calreticulin (CALR) and thrombopoietin receptor (MPL) mutations are also observed in ET and PMF. Additional non-MPN mutations affecting different pathways are also found, particularly in PMF, and are involved in disease initiation and/or in phenotypic changes and /or disease progression and/or response to therapy.
There is an obvious and urgent need for an efficient therapy for MPN. In particular, PMF remain without curative treatment, except allogeneic HSC transplantation and JAK inhibitors have limited effects on the disease outcome. Among novel therapeutic approaches, Peg-IFNα2a (IFN) is the most efficient harboring both high rates of hematological responses in JAK2V617F and CALRmut MPN patients and some molecular responses mainly in JAK2V617F patients including deep molecular response (DMR). Nevertheless, several studies, including our own, have demonstrated that the IFN molecular response in CALRmut patients is heterogeneous and overall much lower than in JAK2V617F patients. Moreover, some JAK2V617F MPN patients do not respond to IFN, and DMR is only observed in around 20% of JAK2V617F patients. Finally, long-term treatments are needed (2-5 years) to obtain a DMR, jeopardizing its success due to possible long-term toxicity.
The underlying reasons for failure, drug resistance, heterogeneous molecular response in CALRmut patients and the long delays for DMR in JAK2V617F patients remain unclear, largely because the mechanisms by which IFNα targets MPN malignant clones remain elusive.
Significant improvement of IFN efficacy cannot be achieved without basic and clinical research. Hence our two lines of research are to
- Understand how IFNα specifically targets neoplastic HSCs
- Predicting and improving patient response during IFNα therapy
The main objective from the basic point of view is to draw the clonal architecture of the mutated cells of the patients during IFN treatment to provide a better understanding of the mechanism of action of IFN in MPN: namely how and at what level of hematopoietic differentiation the IFN specifically targets JAK2V617F HSCs and if and why it does not have the same effect on CALRm patients.
Our previous clinical study using clonal architecture data combined with a mathematical model indicates that depletion of JAK2V617F HSC by differentiation into progenitors and thus loss of self-renewal may be the critical mechanism for eradication of JAK2V617F disease by IFN. We hope to confirm this hypothesis in a larger number of patients and to understand the basis of the differential effects of JAK2V617F and CALRm mutations on disease-initiating stem cells.
The secondary objectives are to:
- Validate the resistance of CALRm patients to IFN treatment in a larger number of patients. Moreover, high IFN doses, in contrast to JAK2V617F patients, are deleterious to the molecular response for reasons that remain to be understood.
- Investigate the role of associated mutations in IFN-induced molecular responses.
IFN treatments have been shown to promote the appearance of clones (JAK2V617F positive or JAK2V617F negative) with additional mutations, such as Tet2 or DNMT3a, which could be responsible for resistance to IFN treatment . We would like to increase the number of patients and their follow-up to analyze the role of these mutations in treatment success. Moreover, these additional mutations (new or selected by the treatment) could favor the development of more severe pathologies (MF, MDS, AML) than PV or TE and would be important to monitor on the follow-up of IFN-treated patients.
-Explore in vitro the effect of IFN in combination with other molecules on primary patients' cells. Indeed, our basic study already showed the involvement of PML in the mechanism of action of IFN and we found that arsenic greatly potentiates the effect of IFN. We will deeply investigate by which exact mechanisms.
All the data will be collected in patients before IFN treatment or during the IFN treatment and data will be collected by single cell genotyping of colonies and/or by single cell RNA sequencing coupled to genotyping of mutations and/or in vitro assays.
- Conditions
- Myeloproliferative Neoplasm
- Keywords
- interferon alpha, Hematopoietic stem cell, mechanism of action
- Medical subject headings
- Myeloproliferative Disorders
What is being measured
The primary outcome is the main question the study is designed to answer.
Clonal architecture of hematopoietic progenitors of patients
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors are isolated and separated by FACS according to their more or less mature CD34+/CD38±/CD90± phenotype and then cultured for 14 days at the single-cell level. The cells resulting from their differentiation in culture are lysed and their DNA is isolated and stored for PCR or NGS analysis in order to define their mutational profile. Once the genotyping of these cells is established, the DNA is destroyed and nothing remains of the initial biological sample.
Measured: During 5 years from day 0 of IFN treatment, 3 to 4 times per year
Single cell RNA sequencing coupled to genotyping
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors are isolated and subjected to scRNA-seq using long-read techniques (PromethION). The trajectories of hematopoietic differentiation and RNA sequencing will be analyzed in each cell
Measured: at day 0 of IFN treatment and at two other time point (between 3 and 24 months of treatment)
Culture of progenitors in vitro
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors (CD34+) are then cultured in serum free medium with cytokines or in semisolid medium in the presence of IFN alone or in association.
Measured: during 5 years from day 0
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted9 May 2023
- Study start16 Mar 2023
- Primary completion16 Mar 2028 (estimated)
- Study completion16 Mar 2033 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (8)Papers the sponsor has linked to this study.
- Other trials for Myeloproliferative NeoplasmStudies of the same condition, open and under way.
- More trials run by Institut National de la Santé Et de la Recherche Médicale, FranceThe 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
- Prospective
- Enrolment
- 80 participants (estimated)
Sponsor and investigators
- Sponsor type
- Other government
- Responsible party
- Sponsor
- Investigators
- Florence Pasquier, MD,PhD, Principal investigator, florence.pasquier@gustaveroussy.fr
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05850273
- Sponsor's protocol ID
- C21-46
- Other IDs
- 2021-A03067-34
- Acronym
- IFN&SMP
- Status last verified
- Apr 2026
- First submitted
- 28 Apr 2023
- Last updated
- 14 Apr 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
James C, Ugo V, Le Couedic JP, Staerk J, Delhommeau F, Lacout C, Garcon L, Raslova H, Berger R, Bennaceur-Griscelli A, Villeval JL, Constantinescu SN, Casadevall N, Vainchenker W. A unique clonal JAK2 mutation leading to constitutive signalling causes polycythaemia vera. Nature. 2005 Apr 28;434(7037):1144-8. doi: 10.1038/nature03546.
PubMed 15793561Klampfl T, Gisslinger H, Harutyunyan AS, Nivarthi H, Rumi E, Milosevic JD, Them NC, Berg T, Gisslinger B, Pietra D, Chen D, Vladimer GI, Bagienski K, Milanesi C, Casetti IC, Sant'Antonio E, Ferretti V, Elena C, Schischlik F, Cleary C, Six M, Schalling M, Schonegger A, Bock C, Malcovati L, Pascutto C, Superti-Furga G, Cazzola M, Kralovics R. Somatic mutations of calreticulin in myeloproliferative neoplasms. N Engl J Med. 2013 Dec 19;369(25):2379-90. doi: 10.1056/NEJMoa1311347. Epub 2013 Dec 10.
PubMed 24325356Mascarenhas J, Kosiorek HE, Prchal JT, Rambaldi A, Berenzon D, Yacoub A, Harrison CN, McMullin MF, Vannucchi AM, Ewing J, O'Connell CL, Kiladjian JJ, Mead AJ, Winton EF, Leibowitz DS, De Stefano V, Arcasoy MO, Kessler CM, Catchatourian R, Rondelli D, Silver RT, Bacigalupo A, Nagler A, Kremyanskaya M, Levine MF, Arango Ossa JE, McGovern E, Sandy L, Salama ME, Najfeld V, Tripodi J, Farnoud N, Penson AV, Weinberg RS, Price L, Goldberg JD, Barbui T, Marchioli R, Tognoni G, Rampal RK, Mesa RA, Dueck AC, Hoffman R. A randomized phase 3 trial of interferon-alpha vs hydroxyurea in polycythemia vera and essential thrombocythemia. Blood. 2022 May 12;139(19):2931-2941. doi: 10.1182/blood.2021012743.
PubMed 35007321Mosca M, Hermange G, Tisserand A, Noble R, Marzac C, Marty C, Le Sueur C, Campario H, Vertenoeil G, El-Khoury M, Catelain C, Rameau P, Gella C, Lenglet J, Casadevall N, Favier R, Solary E, Cassinat B, Kiladjian JJ, Constantinescu SN, Pasquier F, Hochberg ME, Raslova H, Villeval JL, Girodon F, Vainchenker W, Cournede PH, Plo I. Inferring the dynamics of mutated hematopoietic stem and progenitor cells induced by IFNalpha in myeloproliferative neoplasms. Blood. 2021 Dec 2;138(22):2231-2243. doi: 10.1182/blood.2021010986.
PubMed 34407546Dagher T, Maslah N, Edmond V, Cassinat B, Vainchenker W, Giraudier S, Pasquier F, Verger E, Niwa-Kawakita M, Lallemand-Breitenbach V, Plo I, Kiladjian JJ, Villeval JL, de The H. JAK2V617F myeloproliferative neoplasm eradication by a novel interferon/arsenic therapy involves PML. J Exp Med. 2021 Feb 1;218(2):e20201268. doi: 10.1084/jem.20201268.
PubMed 33075130Gisslinger H, Klade C, Georgiev P, Krochmalczyk D, Gercheva-Kyuchukova L, Egyed M, Rossiev V, Dulicek P, Illes A, Pylypenko H, Sivcheva L, Mayer J, Yablokova V, Krejcy K, Grohmann-Izay B, Hasselbalch HC, Kralovics R, Kiladjian JJ; PROUD-PV Study Group. Ropeginterferon alfa-2b versus standard therapy for polycythaemia vera (PROUD-PV and CONTINUATION-PV): a randomised, non-inferiority, phase 3 trial and its extension study. Lancet Haematol. 2020 Mar;7(3):e196-e208. doi: 10.1016/S2352-3026(19)30236-4. Epub 2020 Jan 31.
PubMed 32014125Verger E, Cassinat B, Chauveau A, Dosquet C, Giraudier S, Schlageter MH, Ianotto JC, Yassin MA, Al-Dewik N, Carillo S, Legouffe E, Ugo V, Chomienne C, Kiladjian JJ. Clinical and molecular response to interferon-alpha therapy in essential thrombocythemia patients with CALR mutations. Blood. 2015 Dec 10;126(24):2585-91. doi: 10.1182/blood-2015-07-659060. Epub 2015 Oct 20.
PubMed 26486786Knudsen TA, Skov V, Stevenson K, Werner L, Duke W, Laurore C, Gibson CJ, Nag A, Thorner AR, Wollison B, Hansen DL, Ellervik C, El Fassi D, de Stricker K, Ocias LF, Brabrand M, Bjerrum OW, Overgaard UM, Frederiksen M, Kristensen TK, Kruse TA, Thomassen M, Mourits-Andersen T, Severinsen MT, Stentoft J, Starklint J, Neuberg DS, Kjaer L, Larsen TS, Hasselbalch HC, Lindsley RC, Mullally A. Genomic profiling of a randomized trial of interferon-alpha vs hydroxyurea in MPN reveals mutation-specific responses. Blood Adv. 2022 Apr 12;6(7):2107-2119. doi: 10.1182/bloodadvances.2021004856.
PubMed 34507355
Study at a glance
From the registry record, last updated by the sponsor on 14 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Mechanism of Action of Interferon in the Treatment of Myeloproliferative Neoplasms
- ClinicalTrials.gov ID
- NCT05850273
- Acronym / sponsor ID
- IFN&SMP / C21-46
- Conditions
- Myeloproliferative Neoplasm
- Keywords
- interferon alpha, Hematopoietic stem cell, mechanism of action
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 80 participants (estimated)
- Lead sponsor
- Institut National de la Santé Et de la Recherche Médicale, FranceOther government
- Study start
- 16 Mar 2023 (actual)
- Primary completion
- 16 Mar 2028 (estimated)
- Study completion
- 16 Mar 2033 (estimated)
- First posted
- 9 May 2023 (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.
Classical BCR-ABL-negative myeloproliferative neoplasms (MPN) include: Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). They are myeloid malignancies resulting from the transformation of a multipotent hematopoietic stem cell (HSC) caused by mutations activating the JAK2/STAT pathway. The most prevalent mutation is JAK2V617F. Type 1 and Type 2 calreticulin (CALR) and thrombopoietin receptor (MPL) mutations are also observed in ET and PMF. Additional non-MPN mutations affecting different pathways are also found, particularly in PMF, and are involved in disease initiation and/or in phenotypic changes and /or disease progression and/or response to therapy.
There is an obvious and urgent need for an efficient therapy for MPN. In particular, PMF remain without curative treatment, except allogeneic HSC transplantation and JAK inhibitors have limited effects on the disease outcome. Among novel therapeutic approaches, Peg-IFNα2a (IFN) is the most efficient harboring both high rates of hematological responses in JAK2V617F and CALRmut MPN patients and some molecular responses mainly in JAK2V617F patients including deep molecular response (DMR). Nevertheless, several studies, including our own, have demonstrated that the IFN molecular response in CALRmut patients is heterogeneous and overall much lower than in JAK2V617F patients. Moreover, some JAK2V617F MPN patients do not respond to IFN, and DMR is only observed in around 20% of JAK2V617F patients. Finally, long-term treatments are needed (2-5 years) to obtain a DMR, jeopardizing its success due to possible long-term toxicity.
The underlying reasons for failure, drug resistance, heterogeneous molecular response in CALRmut patients and the long delays for DMR in JAK2V617F patients remain unclear, largely because the mechanisms by which IFNα targets MPN malignant clones remain elusive.
Significant improvement of IFN efficacy cannot be achieved without basic and clinical research. Hence our two lines of research are to
- Understand how IFNα specifically targets neoplastic HSCs
- Predicting and improving patient response during IFNα therapy
Detailed description
Classical BCR-ABL-negative myeloproliferative neoplasms (MPN) include: Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). They are myeloid malignancies resulting from the transformation of a multipotent hematopoietic stem cell (HSC) caused by mutations activating the JAK2/STAT pathway. The most prevalent mutation is JAK2V617F. Type 1 and Type 2 calreticulin (CALR) and thrombopoietin receptor (MPL) mutations are also observed in ET and PMF. Additional non-MPN mutations affecting different pathways are also found, particularly in PMF, and are involved in disease initiation and/or in phenotypic changes and /or disease progression and/or response to therapy.
There is an obvious and urgent need for an efficient therapy for MPN. In particular, PMF remain without curative treatment, except allogeneic HSC transplantation and JAK inhibitors have limited effects on the disease outcome. Among novel therapeutic approaches, Peg-IFNα2a (IFN) is the most efficient harboring both high rates of hematological responses in JAK2V617F and CALRmut MPN patients and some molecular responses mainly in JAK2V617F patients including deep molecular response (DMR). Nevertheless, several studies, including our own, have demonstrated that the IFN molecular response in CALRmut patients is heterogeneous and overall much lower than in JAK2V617F patients. Moreover, some JAK2V617F MPN patients do not respond to IFN, and DMR is only observed in around 20% of JAK2V617F patients. Finally, long-term treatments are needed (2-5 years) to obtain a DMR, jeopardizing its success due to possible long-term toxicity.
The underlying reasons for failure, drug resistance, heterogeneous molecular response in CALRmut patients and the long delays for DMR in JAK2V617F patients remain unclear, largely because the mechanisms by which IFNα targets MPN malignant clones remain elusive.
Significant improvement of IFN efficacy cannot be achieved without basic and clinical research. Hence our two lines of research are to
- Understand how IFNα specifically targets neoplastic HSCs
- Predicting and improving patient response during IFNα therapy
The main objective from the basic point of view is to draw the clonal architecture of the mutated cells of the patients during IFN treatment to provide a better understanding of the mechanism of action of IFN in MPN: namely how and at what level of hematopoietic differentiation the IFN specifically targets JAK2V617F HSCs and if and why it does not have the same effect on CALRm patients.
Our previous clinical study using clonal architecture data combined with a mathematical model indicates that depletion of JAK2V617F HSC by differentiation into progenitors and thus loss of self-renewal may be the critical mechanism for eradication of JAK2V617F disease by IFN. We hope to confirm this hypothesis in a larger number of patients and to understand the basis of the differential effects of JAK2V617F and CALRm mutations on disease-initiating stem cells.
The secondary objectives are to:
- Validate the resistance of CALRm patients to IFN treatment in a larger number of patients. Moreover, high IFN doses, in contrast to JAK2V617F patients, are deleterious to the molecular response for reasons that remain to be understood.
- Investigate the role of associated mutations in IFN-induced molecular responses.
IFN treatments have been shown to promote the appearance of clones (JAK2V617F positive or JAK2V617F negative) with additional mutations, such as Tet2 or DNMT3a, which could be responsible for resistance to IFN treatment . We would like to increase the number of patients and their follow-up to analyze the role of these mutations in treatment success. Moreover, these additional mutations (new or selected by the treatment) could favor the development of more severe pathologies (MF, MDS, AML) than PV or TE and would be important to monitor on the follow-up of IFN-treated patients.
-Explore in vitro the effect of IFN in combination with other molecules on primary patients' cells. Indeed, our basic study already showed the involvement of PML in the mechanism of action of IFN and we found that arsenic greatly potentiates the effect of IFN. We will deeply investigate by which exact mechanisms.
All the data will be collected in patients before IFN treatment or during the IFN treatment and data will be collected by single cell genotyping of colonies and/or by single cell RNA sequencing coupled to genotyping of mutations and/or in vitro assays.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- The studied population will be all men and women of legal age who were not vulnerable and whose diagnosis of MPN had been previously established by the referring physician. They are therefore voluntary patients of legal age who are not vulnerable and who suffer from PV, ET or MF. The selection of patients is according to the availability of the caregivers for this study but with a preference for this second study towards CALRm patients (rarer) rather than JAK2V617F. Our wish is to integrate a maximum of 50 patients (10/year) knowing that the limitation is the capacity (personnel and finance) of our INSERM laboratory to study this high number of patients.
Key inclusion criteria (6 listed)
- Adult male or female 18 years of age or older
- Diagnosis of MPN has been previously established by the referring physician and that physician will have decided to treat with pegylated IFN. Patients will be treated or untreated at the time of inclusion and may be newly diagnosed patients.
- These patients will be affiliated with or benefit from a social security plan
- For all these patients an additional 20-40 mL will be collected except for some PV patients who are treated conventionally by phlebotomy. In this case, we will collect blood bags from these patients. The volumes vary between 300 and 450 mL of blood depending on the weight and size of the patients.
- We will also include in this protocol any patient whose MPN, either PV, TE or MF, will have progressed to acute leukemia (AL) during treatment. These will be patients with AP of MPN (MPN can also progress to acute myeloid leukemia (AML) by acute transformation (AT) of MPN).
Key exclusion criteria (2 listed)
- The non-inclusion criterion concerns the anemia that some MF patients may suffer from. Therefore, patients with anemia (Hb<10g) or transfusion dependency (≥ 1 packed red blood cell per month) at the time of the referral monitoring visit are not included in the research.
- Persons under court protection, guardianship or curatorship
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
Clonal architecture of hematopoietic progenitors of patients
Time frame: During 5 years from day 0 of IFN treatment, 3 to 4 times per year
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors are isolated and separated by FACS according to their more or less mature CD34+/CD38±/CD90± phenotype and then cultured for 14 days at the single-cell level. The cells resulting from their differentiation in culture are lysed and their DNA is isolated and stored for PCR or NGS analysis in order to define their mutational profile. Once the genotyping of these cells is established, the DNA is destroyed and nothing remains of the initial biological sample.
Single cell RNA sequencing coupled to genotyping
Time frame: at day 0 of IFN treatment and at two other time point (between 3 and 24 months of treatment)
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors are isolated and subjected to scRNA-seq using long-read techniques (PromethION). The trajectories of hematopoietic differentiation and RNA sequencing will be analyzed in each cell
Culture of progenitors in vitro
Time frame: during 5 years from day 0
Blood samples are processed to separate mature cells (granulocytes) from progenitors (CD34+ marker). Progenitors (CD34+) are then cultured in serum free medium with cytokines or in semisolid medium in the presence of IFN alone or in association.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 14 Apr 2026.
- Results publication: PubMed 15793561James C, Ugo V, Le Couedic JP, Staerk J, Delhommeau F, Lacout C, Garcon L, Raslova H, Berger R, Bennaceur-Griscelli A, Villeval JL, Constantinescu SN, Casadevall N, Vainchenker W. A unique clonal JAK2 mutation leading to constitutive signalling causes polycythaemia vera. Nature. 2005 Apr 28;434(7037):1144-8. doi: 10.1038/nature03546.
- Results publication: PubMed 24325356Klampfl T, Gisslinger H, Harutyunyan AS, Nivarthi H, Rumi E, Milosevic JD, Them NC, Berg T, Gisslinger B, Pietra D, Chen D, Vladimer GI, Bagienski K, Milanesi C, Casetti IC, Sant'Antonio E, Ferretti V, Elena C, Schischlik F, Cleary C, Six M, Schalling M, Schonegger A, Bock C, Malcovati L, Pascutto C, Superti-Furga G, Cazzola M, Kralovics R. Somatic mutations of calreticulin in myeloproliferative neoplasms. N Engl J Med. 2013 Dec 19;369(25):2379-90. doi: 10.1056/NEJMoa1311347. Epub 2013 Dec 10.
- Results publication: PubMed 35007321Mascarenhas J, Kosiorek HE, Prchal JT, Rambaldi A, Berenzon D, Yacoub A, Harrison CN, McMullin MF, Vannucchi AM, Ewing J, O'Connell CL, Kiladjian JJ, Mead AJ, Winton EF, Leibowitz DS, De Stefano V, Arcasoy MO, Kessler CM, Catchatourian R, Rondelli D, Silver RT, Bacigalupo A, Nagler A, Kremyanskaya M, Levine MF, Arango Ossa JE, McGovern E, Sandy L, Salama ME, Najfeld V, Tripodi J, Farnoud N, Penson AV, Weinberg RS, Price L, Goldberg JD, Barbui T, Marchioli R, Tognoni G, Rampal RK, Mesa RA, Dueck AC, Hoffman R. A randomized phase 3 trial of interferon-alpha vs hydroxyurea in polycythemia vera and essential thrombocythemia. Blood. 2022 May 12;139(19):2931-2941. doi: 10.1182/blood.2021012743.
- Results publication: PubMed 34407546Mosca M, Hermange G, Tisserand A, Noble R, Marzac C, Marty C, Le Sueur C, Campario H, Vertenoeil G, El-Khoury M, Catelain C, Rameau P, Gella C, Lenglet J, Casadevall N, Favier R, Solary E, Cassinat B, Kiladjian JJ, Constantinescu SN, Pasquier F, Hochberg ME, Raslova H, Villeval JL, Girodon F, Vainchenker W, Cournede PH, Plo I. Inferring the dynamics of mutated hematopoietic stem and progenitor cells induced by IFNalpha in myeloproliferative neoplasms. Blood. 2021 Dec 2;138(22):2231-2243. doi: 10.1182/blood.2021010986.
- Results publication: PubMed 33075130Dagher T, Maslah N, Edmond V, Cassinat B, Vainchenker W, Giraudier S, Pasquier F, Verger E, Niwa-Kawakita M, Lallemand-Breitenbach V, Plo I, Kiladjian JJ, Villeval JL, de The H. JAK2V617F myeloproliferative neoplasm eradication by a novel interferon/arsenic therapy involves PML. J Exp Med. 2021 Feb 1;218(2):e20201268. doi: 10.1084/jem.20201268.
- Results publication: PubMed 32014125Gisslinger H, Klade C, Georgiev P, Krochmalczyk D, Gercheva-Kyuchukova L, Egyed M, Rossiev V, Dulicek P, Illes A, Pylypenko H, Sivcheva L, Mayer J, Yablokova V, Krejcy K, Grohmann-Izay B, Hasselbalch HC, Kralovics R, Kiladjian JJ; PROUD-PV Study Group. Ropeginterferon alfa-2b versus standard therapy for polycythaemia vera (PROUD-PV and CONTINUATION-PV): a randomised, non-inferiority, phase 3 trial and its extension study. Lancet Haematol. 2020 Mar;7(3):e196-e208. doi: 10.1016/S2352-3026(19)30236-4. Epub 2020 Jan 31.
- Results publication: PubMed 26486786Verger E, Cassinat B, Chauveau A, Dosquet C, Giraudier S, Schlageter MH, Ianotto JC, Yassin MA, Al-Dewik N, Carillo S, Legouffe E, Ugo V, Chomienne C, Kiladjian JJ. Clinical and molecular response to interferon-alpha therapy in essential thrombocythemia patients with CALR mutations. Blood. 2015 Dec 10;126(24):2585-91. doi: 10.1182/blood-2015-07-659060. Epub 2015 Oct 20.
- Results publication: PubMed 34507355Knudsen TA, Skov V, Stevenson K, Werner L, Duke W, Laurore C, Gibson CJ, Nag A, Thorner AR, Wollison B, Hansen DL, Ellervik C, El Fassi D, de Stricker K, Ocias LF, Brabrand M, Bjerrum OW, Overgaard UM, Frederiksen M, Kristensen TK, Kruse TA, Thomassen M, Mourits-Andersen T, Severinsen MT, Stentoft J, Starklint J, Neuberg DS, Kjaer L, Larsen TS, Hasselbalch HC, Lindsley RC, Mullally A. Genomic profiling of a randomized trial of interferon-alpha vs hydroxyurea in MPN reveals mutation-specific responses. Blood Adv. 2022 Apr 12;6(7):2107-2119. doi: 10.1182/bloodadvances.2021004856.
- 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.
Léa Durix, MD,PhD contact
Florence Pasquier, MD,PhD principal investigator
florence.pasquier@gustaveroussy.fr
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 Myeloproliferative Neoplasm, run by Institut National de la Santé Et de la Recherche Médicale, France 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 6 inclusion and 2 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: looking for participants now, as of the sponsor's last update on 14 Apr 2026. 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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact isabelle Plo, PhD (+33 1 42 11 54 93, isabelle.plo@gustaveroussy.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Clonal architecture of hematopoietic progenitors of patients (time frame: During 5 years from day 0 of IFN treatment, 3 to 4 times per year). The study lists 3 primary outcomes in all. 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 NCT05850273, which also lists 8 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 14 Apr 2026.