View clinical trials related to Thrombocythemia, Essential.
Filter by:This research is looking at two conditions, Essential Thrombocythemia (ET) and Polycythemia Vera (PV). ET causes people to produce too many blood cells called platelets and PV causes too many platelets and red blood cells to be made. Platelets are particles which circulate in the blood stream and normally prevent bleeding and bruising. Having too many platelets in the blood increases the risk of developing blood clots, which can result in life threatening events like heart attacks and strokes. When the number of red blood cells is increased in PV this will slow the speed of blood flow in the body and increases the risk of developing blood clots. The purpose of this study is to look at the effectiveness of giving participants who have been diagnosed with ET or PV one of two different study regimens over time. The study subject will be followed for their condition for about 5 years. The subject will be randomized into one of two study regimens, either Pegylated Interferon Alfa-2a (PEGASYS) or Aspirin and Hydroxyurea (also called Hydroxycarbamide). The subject must be newly diagnosed or already receiving treatment for either PV or ET. Each of the study drugs used in this study is already being used to treat subjects with ET or PV currently, but the investigators are unsure which study drug is better.
The aim of this research is to look at two conditions, Essential Thrombocythemia (ET) and Polycythemia Vera (PV). ET causes people to produce too many blood cells called platelets and PV causes too many platelets and red blood cells to be made. Platelets are particles which circulate in the blood stream and normally prevent bleeding and bruising. Having too many platelets in the blood increases the risk of developing blood clots, which can result in life threatening events like heart attacks and strokes. When the number of red blood cells is increased in PV this will slow the speed of blood flow in the body and increases the risk of developing blood clots. It is important for patients with ET or PV who are at risk of blood clots to receive drugs which will minimize the risks of developing these blood clots but at the moment the investigators are not sure which drugs will best control the disorder. The purpose of this study is to look at the effectiveness of giving patients who have been diagnosed with ET and PV a study drug regimen using Aspirin and PEGASYS (also known as Pegylated interferon alfa-2a, instead of the standard treatment drug called Hydroxyurea (or hydroxycarbamide or Hydroxyurea), for whom this drug may not be suitable. The drug may not be suitable either because it is not adequately controlling the number of blood cells or some specific side effects occur.
This is a phase II open-label study of single agent imetelstat in patients with essential thrombocytopenia or with polycythemia vera who have failed or are intolerant to at least one prior therapy, or who refuse standard therapy.
This extension protocol to the core study CCL09101 allows patients who have tolerated the drug and derived a clinical benefit, to continue to receive treatment beyond the 9 cycles of the core protocol. Long term safety and efficacy of CYT387 (momelotinib) will be evaluated.
This is a multicenter, phase III, randomized, subject and sponsor-blinded, placebo-controlled study to determine the treatment effect of "Anagrelide retard" in subjects with Essential Thrombocythaemia (ET) at "defined risk" (definition of risk criteria: see Inclusion Criteria Section 5.1) The study is planned as a 2-stage procedure according to Bauer and Köhne: After recruitment of 140 subjects an interim analysis with re-assessment of sample size is planned in an adaptive manner. As the confirmatory analysis will be based on a time-to-event evaluation (i.e. time to 1st clinically significant ET related event), there is no stipulated observation time identically applying for all subjects. Yet, with an interim analysis being performed after having recruited 140 subjects - which is expected to be reached after 1 year - the estimated observation time for a subject in stage I will also be about 1 year. (Details are explained in the section "Statistical Considerations"). Subjects will be randomized in a 1:1 ratio to one of the following two arms: Group A: Anagrelide retard Group B: Placebo An a priori stratification is planned for the JAK-2 mutational status. For exploratory purposes a post hoc stratification is used for obtaining covariate adjusted results, for the following other potentially predictive factors: sex, age, Factor V Leiden, and BMI. Dosing will be started with 1 tablet per day for week 1 and will be titrated up according to response (platelet reduction) to 2 tablets in week 2. Dosing may be further increased or decreased according to platelet response in week 3 and 4. However, the maximum dose is 4 tablets (=8mg) per day. After week 4, the maximum dose to achieve optimal platelet counts (<450 G/L) should be maintained (for visit schedule see study flow chart section IV). To verify a treatment response, platelet counts must be evaluated at every visit. The platelet count values will be withheld from the subjects for the duration of stage I or stage II respectively. The subjects have to agree explicitly to this procedure by signing the Informed Consent form. This is a patient and sponsor-blinded clinical study. The trial medical is packaged in the blinded fashion to keep the patient unaware (blinded) towards the actual treatment group they were randomized to. The sponsor functions (including medical monitor, pharmacovigilance manager, clinical project manager, trial data manager and trial statistician) with stay blinded in the course of the study until the database lock. Randomization scheme will be prepared by an independent statistician (not otherwise involved in the study), and will be stored securely with no access to it by the sponsor functions mentioned above. The process of randomization (provision of the individual drug-allocation information to the subjects) will be carried out by a trained staff by Harrison, in adherence to the procedures to keep the other blinded functions unaware of this information (blinded). Unblinding envelopes, which contain the treatment code per patient number for identification of treatment in case when a safety-relevant unblinding needed, will be stored at the sponsor's site. At the end of the study, verification of the extent of maintaining the blind by checking if the envelopes have been broken, will take place and will be properly documented. If the sealed envelope will broken to provide treatment identification, the date of breaking the code, the initials of the person who broke the code and the reason will be stated on the envelope. The operational details on the blinding procedures are outlined in the relevant working guidelines (ARETA Study Working Guideline for idv staff and ARETA Study Working Guideline for Harrison, each in its current version). Investigator will not be blinded in this study, i.e. in case of a medical need individual patient management will be driven by the full knowledge of the trial related interventions. For the case, the sponsor will need to unblind a patient (e.g. due to safety reasons), the above mentioned (in this section) envelopes will be used. Only treatment naïve subjects, in respect to cytoreductive drugs with confirmed diagnosis of ET (centralized re-evaluation according to WHO, 2008; see Section 6.2.1) and assessment of JAK-2 status (centralized re-evaluation of JAK-2 status; see Section 6.2.2) will be enrolled. As described above, stage I of the study will be considered as closed as soon as 140 subjects have been recruited. The duration of stage II depends on the result of the re-assessment of sample size. Once stage I is finished, stage I subjects will enter into an extension period for a maximum of three years.
The purpose of this study is to investigate how effective and safe SPD422 (Anagrelide Hydrochloride) is in Japanese subjects, diagnosed with Essential Thrombocythemia, who's previously treatment has either not been effective or has caused unacceptable adverse reactions. The study will aim to show that platelet counts can be safely reduced in treated patients to below 600 x 10^9/L after a minimum of three months treatment. To demonstrate an positive effect platelet levels will need to remain below 600 x 10^9/L for at least 4 weeks.
The goal of this clinical research study is to learn if SB939 can help to control myelofibrosis. The safety of this drug will also be studied.
RATIONALE: Infection prophylaxis and management may help prevent cytomegalovirus (CMV) infection caused by a stem cell transplant. PURPOSE:This clinical trial studies infection prophylaxis and management in treating cytomegalovirus infection in patients with hematologic malignancies previously treated with donor stem cell transplant.
The aim of this study is to evaluate the progression of ET in children (aged 6-17years inclusive) over a period of 5 years maximum. The study will also assess how children are diagnosed, treatment options for those children with symptoms and events related to their ET and the outcomes of those treatments.
This is an observational study to explore how different treatment regimens affect continuation with treatment in the first 6 months following initiation of XAGRID into adult patients' essential thrombocythemia therapy.