Study aims to predict drug failure in rare blood cancer
NCT ID NCT05853458
First seen Jun 27, 2026 · Last updated Aug 19, 2026 · Updated 2 times
Summary
This study looked at whether two simple blood test results—hemoglobin and red blood cell distribution width—could predict if a person with polycythemia vera would stop responding to the drug hydroxyurea. Researchers planned to follow 76 adults starting hydroxyurea for the first time. The study was terminated early, so results are limited.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 4
Runs after approval, following long-term safety and how well the treatment works in everyday use.
- Participants
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76 people
The number who actually took part.
- Started
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Jul 2023
- Finished
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Feb 2026
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 99 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Key Inclusion criteria 1. Signed informed consent must be obtained prior to participation in the study 2. Patients ≥18 years 3. Confirmed diagnosis of Polycythemia vera (according to WHO 2008, 2016, or 2022 criteria) (Tefferi and Vardiman 2008, Arber et al 2016, Khoury et al 2022) 4. Eastern Cooperative Oncology Group (ECOG) ≤ 2 5. No previous pharmacologic cytoreductive therapy (including investigational drugs) 6. No phlebotomy in last 14 days 7. HU-eligible * High-risk: age ≥ 60 years and/or prior history of thrombosis * Low-risk: showing at least one of the defined criteria * Signs of disease progression (myeloproliferation): * Increase in spleen size or symptomatic splenomegaly * Platelet increase to \> 1,000,000/µl * WBC increase to \> 15,000/µl or higher * Frequent (\> 10 per year) or increasing frequency of phlebotomies * Increasing risk of thromboembolism and bleeding: * New thromboembolism and/or hemorrhagic complications * Microcirculation disorders despite acetyl salicylic acid (ASA) 2x 100 mg/day * Restricted feasibility or intolerance of phlebotomies * Symptomatic iron deficiency * Uncontrolled increase in hematocrit * Severe or distressing disease-related symptoms 8. Female participants of childbearing potential should have a negative serum pregnancy test within 72 hours prior to receiving the first dose of study treatment. Key Exclusion criteria 1. Patients with post-polycythemia vera myelofibrosis (post-PV MF) or accelerated phase/ blast phase myeloproliferative neoplasm acute myeloid leukemia (AP/BP-MPN AML). 2. Patients with a contraindication to HU according to the SmPC (severe bone marrow depression, leukopenia (\< 2.5 x 109 leukocytes/l), thrombocytopenia (\< 100 x 109 platelets/L), severe anemia (\< 10 g/dL HGB). 3. Patients with rare hereditary galactose intolerance, total lactase deficiency or glucose-galactose malabsorption in their past medical history. 4. Active uncontrolled infection that is considered by the Investigator as a reason for exclusion. 5. Active malignancies (except for carcinoma in situ; prostate cancer and breast cancer in remission and - where necessary - ongoing hormonal therapy). 6. Inadequate renal function as demonstrated by Modification of Diet in Renal Disease estimate glomerular filtration rate (MDRDeGFR) \< 30 mL/min/1.73m2 or on dialysis. 7. Pregnant or nursing (lactating) women, where pregnancy is defined as the state of a female after conception and until the termination of gestation, confirmed by a positive human chorionic gonadotrophin (hCG) laboratory test. 8. Sexually active males unwilling to use a condom during intercourse while taking study treatment and for at least 3 months after stopping study treatment. 9. HIV patients treated with nucleoside reverse transcriptase inhibitors like didanosine and stavudine. Other inclusion/exclusion criteria may apply
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Novartis Investigative Site
Heidelberg, Baden-Wurttemberg, 69115, Germany
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Novartis Investigative Site
Kronach, Bavaria, 96317, Germany
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Novartis Investigative Site
Straubing, Bavaria, 94315, Germany
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Novartis Investigative Site
Langen, Hesse, 63225, Germany
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Novartis Investigative Site
Lingen, Lower Saxony, 49808, Germany
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Novartis Investigative Site
Aachen, North Rhine-Westphalia, 52064, Germany
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Novartis Investigative Site
Cologne, North Rhine-Westphalia, 50674, Germany
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Novartis Investigative Site
Dortmund, North Rhine-Westphalia, 44309, Germany
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Novartis Investigative Site
Velbert, North Rhine-Westphalia, 42551, Germany
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Novartis Investigative Site
Saarbrücken, Saarland, 66113, Germany
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Novartis Investigative Site
Merseburg, Saxony-Anhalt, 06217, Germany
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Novartis Investigative Site
Berlin, 10407, Germany
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Novartis Investigative Site
Donauwörth, 86609, Germany
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Novartis Investigative Site
Dresden, 01307, Germany
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Novartis Investigative Site
Erding, 85435, Germany
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Novartis Investigative Site
Gütersloh, 33332, Germany
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Novartis Investigative Site
Hanover, 30161, Germany
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Novartis Investigative Site
Kiel, 24105, Germany
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Novartis Investigative Site
Mutlangen, 73557, Germany
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Novartis Investigative Site
Naunhof, 04683, Germany
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Novartis Investigative Site
Würselen, 52146, Germany
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