Assessing Biomarker in Giant Cell Arteritis and Polymyalgia Rheumatic

Официальное название

Multimodal Assessment of Biomarkers for Diagnosing Giant Cell Arteritis and Polymyalgia Rheumatica: A Comprehensive Analysis of Clinical, Laboratory, and Imaging Profiles

Обзор

The GCAIO study is an innovative, multimodal research initiative designed to enhance the understanding, diagnosis, and management of giant cell arteritis (GCA) and frequently associated polymyalgia rheumatica (PMR). This longitudinal study aims to dissect the complex immunological landscape and systemic manifestations of these conditions through a combination of diagnostic imaging and detailed immunological profiling. The study focuses on three primary objectives: (1) Identifying and analyzing cytokine profiles and immune cell phenotypes, employing techniques like flow cytometry, enzyme-linked immunosorbent assays (ELISA), and next-generation sequencing to predict disease activity and therapeutic responses. (2) Advancing diagnostic and monitoring capabilities through the application of novel and established imaging technologies, including MRI, optical coherence tomography angiography (OCTA), and ultrasound. These modalities aim to improve the detection of neuro-ophthalmological, cardiac, and aortic complications in GCA, potentially offering more precise monitoring and earlier diagnosis. (3) Enhancing the understanding of PMR within the context of GCA by exploring specific biomarkers and advanced imaging to refine diagnostic accuracy and treatment strategies, thus improving patient outcomes.

Подробное описание

GCA is an immune-mediated vasculitis that affects medium and large-sized vessels, leading to vascular changes and occlusion due to severe vascular inflammation, neoangiogenesis, and remodeling. GCA has the potential to impact almost any organ. Despite advancements in understanding the pathophysiology and clinical manifestations of GCA, many aspects of the disease remain unexplored. The GCAIO study aims to fill these gaps using an integrative research approach to enhance the diagnosis, understanding, and management of GCA.

The GCAIO study cohort includes patients at their first diagnosis, throughout the disease, and during recurrent activity, facilitating a thorough longitudinal analysis of GCA. The research focuses on the complex immunological processes of the disease. Techniques such as flow cytometry (FACS), enzyme-linked immunosorbent assays (ELISA), and 3'-mRNA transcriptome analysis are employed to identify biomarkers that can assess GCA activity, track disease progression, and predict therapeutic responses, particularly for those unresponsive to interleukin (IL)-6 receptor (R) inhibitors. Additionally, the project is pioneering personalized treatment protocols tailored to individual immune profiles by developing a cell-based ex-vivo assay designed to forecast how patients will respond to different disease-modifying anti-rheumatic drugs (DMARDs).

Alongside the immunological research, the project emphasizes improving diagnostic and monitoring techniques through imaging technologies. Recent advancements have demonstrated that optimized diagnostics significantly enhance treatment outcomes for GCA patients. The planned prospective multimodal imaging aims to investigate potential neuro-ophthalmological, cardiac, and aortic manifestations during the course of GCA, enabling a detailed assessment of the involvement of various structures. Established imaging methods such as magnetic resonance imaging (MRI), optical coherence tomography angiography (OCTA), and vascular ultrasound are being extended into new areas to evaluate their diagnostic and prognostic merits. Furthermore, the investigators are exploring innovative diagnostic tools like transorbital ultrasound (TOS) and contrast-enhanced ultrasound (CEUS) for their potential as predictive biomarkers, facilitating earlier diagnosis and more precise disease monitoring. By correlating imaging findings with immunological data, our goal is to alter the way GCA is detected and monitored.

The inclusion of patients with PMR enhances our understanding of its pathophysiology, clinical manifestations, and its connection to often-associated GCA. The investigators are dedicated to developing new diagnostic criteria and exploring alternative therapeutic approaches for PMR maintenance therapy. By identifying alternative clinical, laboratory, or instrumental diagnostic methods to predict PMR, the investigators aim to set new diagnostic standards and deepen our understanding of its pathophysiology and immunological processes.

In summary, the goal of the GCAIO study is to make substantial contributions to the fields of GCA and PMR by developing innovative diagnostic and therapeutic strategies that improve treatment and quality of life for affected patients. The identification of specific biomarkers and the establishment of new diagnostic standards could lead to more precise diagnoses and optimized management of therapy, thereby enhancing patient care and reducing the risk of complications and therapy failures.

Вмешательства

• Диагностический тест Aortic/ cardiac magnetic resonance imaging
  MRI scans will be performed to detect systemic vascular involvement in GCA patients, aiming to provide detailed images of affected tissues.
• Диагностический тест Vascular ultrasound
  Vascular ultrasound will be employed to examine the temporal and axillary arteries in GCA patients, searching for signs indicative of active inflammation.
• Диагностический тест Transorbital Ultrasound
  Transorbital ultrasound will be employed to assess the ophthalmic artery and its branches in GCA patients to detect intracranial inflammatory processes that could lead to severe neuro-ophthalmological complications.
• Диагностический тест Contrast-Enhanced Ultrasound
  Contrast-Enhanced Ultrasound (CEUS) is utilized to evaluate aortic involvement in GCA patients as an alternative, bed-side, realtime, radiation-free diagnostic tool.
• Диагностический тест Optical coherence tomography angiography
  OCTA will be used to assess vascular changes in the retina of GCA patients, providing detailed imaging that can help detect early signs of ocular involvement and identify risk factors of anterior ischemic optic neuropathy.
• Диагностический тест Fluorescein angiography
  Fluorescein angiography will be performed to evaluate blood circulation and highlight any blockages in the blood vessels of the retina in patients with GCA to detect vascular abnormalities that may lead to severe vision complications.
• Диагностический тест Fundus autofluorescence
  This imaging technique will be used to observe the health of the retina and detect any changes in GCA patients that could suggest disease activity, particularly useful for assessing the integrity of the retinal pigment epithelium.
• Диагностический тест Color Fundus Photography
  Color fundus photography will be used to document the appearance of the optic disc and retinal vasculature in GCA patients, aiding in the long-term monitoring of ocular changes and the effects of therapeutic interventions.
• Диагностический тест Cell-based ex-vivo assay with high-content analysis
  This assay predicts individual patient responses to different DMARDs by analyzing patient-derived PBMCs for specific immune responses to therapeutic agents.
• Диагностический тест 3'mRNA sequencing
  3'mRNA sequencing analyzes gene expression profiles related to the immune response in PMR/GCA patients, aiding in understanding the genetic underpinnings of inflammation and vascular remodeling.

Первичные конечные точки

• Number of Participants with Detected Neuro-Ophthalmological Manifestations [Срок оценки: At baseline, 3 months, 6 months, 9 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]
• Number of Participants with Detected Cardiac and Aortic Involvement [Срок оценки: At baseline, 6 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]
• Changes in Immune Cell Phenotype [Срок оценки: At baseline, 6 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]
• Changes in Cytokine Profiles [Срок оценки: At baseline, 6 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]
• Levels of Siglec-9 in Blood [Срок оценки: At baseline, 6 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]
• Levels of sVAP-1 in Blood [Срок оценки: At baseline, 6 months, 12 months, 18 months, and during flare-ups (assessed up to 18 months after diagnosis).]

Критерии участия

Критерии включения

• Informed Consent: Participants (>18 years) must provide written informed consent to voluntarily participate in the study.
• Confirmed Diagnosis: Diagnosis of GCA or PMR confirmed by the treating physician and fulfilling expanded ACR-EULAR classification criteria. Patients must have been either newly diagnosed within the last three days or have experienced a disease flare within the same timeframe.

Критерии исключения

• Severe Renal Insufficiency: Chronic glomerular filtration rate (GFR) less than 30 mL/min.
• Other Medical Conditions Requiring Glucocorticoids: Presence of medical conditions other than GCA or PMR that necessitate continuous or intermittent treatment with oral or parenteral glucocorticoids.
• Other Inflammatory Rheumatic Diseases: Patients with other inflammatory rheumatic diseases.

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Модель наблюдения

Случай-контроль

Центры проведения

Германия · 1 центр

• University Hospital Bonn — Bonn

Идентификаторы

NCT: NCT06460142 · 321/22

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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