There are about 2700 clinical studies being (or have been) conducted in Bulgaria. The country of the clinical trial is determined by the location of where the clinical research is being studied. Most studies are often held in multiple locations & countries.
This randomized, parallel-group, placebo-controlled, multicenter study will evaluate the reduction in disease activity and the safety of tocilizumab (RoActemra/Actemra) in combination with traditional disease-modifying anti-rheumatic drugs (DMARDs) in patients with active, moderate to severe rheumatoid arthritis. In the double-blind part of the study, patients will be randomized to receive either 162 mg tocilizumab or placebo subcutaneously every 2 weeks for 24 weeks using a pre-filled syringe. In the open-label part of the study, patients will be randomized to receive 162 mg tocilizumab subcutaneously every 2 weeks from Week 24 to Week 96 using a pre-filled syringe or an auto-injector.
The purpose of this study is to evaluate the efficacy of inotuzumab ozogamicin plus rituximab in relapsed/refractory aggressive Non-Hodgkin lymphoma patients who are not candidates for intensive high-dose chemotherapy. Specifically, the goal is to demonstrate the superiority of this combination compared with an active comparator arm (investigator's choice of rituximab+bendamustine or rituximab+gemcitabine) using the primary endpoint of overall survival.
AMG 479 is an investigational fully human monoclonal antibody that targets type 1 insulin-like growth factor receptor (IGF-1R). Signaling through IGF-1R plays an important role in the regulation of cell growth and survival. Gemcitabine is administered on days 1, 8 and 15 of a 28 day cycle, AMG 479 or placebo is administered on days 1 and 15 of the 28 day cycle, both are administered intravenously. The primary purpose of the study is to determine if AMG 479 and gemcitabine improves overall survival as compared to placebo and gemcitabine.
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 Phase III study is to evaluate the efficacy, safety and tolerability and health outcomes of retigabine Immediate Release (IR) as adjunctive therapy to each of the following monotherapy Antiepileptic Drug (AED) treatments: carbamazepine/oxcarbazepine, lamotrigine, levetiracetam, or valproic acid in adult subjects with partial-onset seizures (POS) using a flexible dosing regimen.
This study is being carried out to see if a new drug called ticagrelor given twice daily in addition to the ASA therapy decreases the frequency of cardiovascular events (e.g., death from heart disease, heart attack, or stroke).
This is a Phase II, randomized, double-blind, placebo-controlled, parallel-group, multicenter study enrolling patients with active rheumatoid arthritis (RA).
This study will assess the efficacy and safety of ACT-129968 in subjects with partly controlled asthma on reliever therapy only.
The aim of the Von Willebrand Disease (VWD) therapy is to treat and prevent bleeding episodes due to abnormal platelet adhesion and abnormal blood coagulation as a result of low or abnormal Von Willebrand Factor (VWF) and/or Factor VIII (FVIII) levels. The long-term efficacy and safety of a VWF/FVIII concentrate, Biostate, will be investigated in children, adolescents, and adults with VWD in whom treatment with a VWF product is required for prophylactic therapy, haemostatic control during surgery, or control of a non-surgical, spontaneous, or traumatic bleeding event.
The aims of this post-marketing observational study (PMOS) are to evaluate the time period needed to achieve > 30% decrease of intact parathyroid hormone (iPTH) compared to the initial values and to provide data on the tolerability and compliance of treatment with Zemplar (paricalcitol) capsules in the therapy of secondary hyperparathyroidism (SHPT) in patients with chronic kidney disease (CKD) stage 3 or 4 in conditions of routine clinical practice.