Materiały źródłowe

• #1 Granulomatosis With Polyangiitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557827/

  Granulomatosis with polyangiitis (GPA), formerly known as Wegener’s granulomatosis, is a necrotizing vasculitis affecting small to medium-sized vessels. GPA is part of a spectrum of disorders known as antineutrophil cytoplasmic antibody (ANCA)associated vasculitides. The 3 main ANCA-associated vasculitides are GPA, microscopic polyangiitis (MPA), and eosinophilic granulomatosis with polyangiitis (EGPA or Churg-Strauss syndrome). This classification was established at the 2012 Chapel Hill Consensus Conference on the Nomenclature of Systemic Vasculitides. GPA is characterized by a pulmonary-renal syndrome associated with otorhinolaryngological manifestations. […] Several complex interactions involving genetics and microbes have been implicated in the etiology of GPA. The presumption that ANCAs are responsible for inflammation in GPA is now widely accepted. Defective immune-regulatory responses to environmental factors, such as infection or autoantigens, can lead to excessive production of cytokines, which in turn may develop inflammatory granulomatous vascular lesions.

• #1 Granulomatosis With Polyangiitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557827/

  Understanding the 2 primary types of ANCAs—anti-proteinase 3 (PR3) and anti-myeloperoxidase (MPO)—is crucial for comprehending the disease process. Some studies suggest that the specific type of ANCA may have better prognostic value compared to the clinical presentation of the disease. ANCA in GPA typically reacts with PR3, a serine proteinase prevalent in neutrophil granulocytes. When ANCA binds to PR3, it activates neutrophils, increasing their adherence to the endothelium and triggering degranulation, which can damage endothelial cells. […] Neutrophils from GPA patients are more likely to produce neutrophil extracellular traps and exhibit lower DNAse I activity, leading to decreased clearance of neutrophil extracellular traps. Neutrophil extracellular traps are composed of decondensed chromatin and intracellular granules that capture cell components. Anti-PR3 binds to neutrophils, leading to degranulation, reactive oxygen species, adhesion to endothelial cells, and secretion of pro-inflammatory cytokines, especially interleukin-8.

• #1 Granulomatosis With Polyangiitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK557827/

  The etiology of GPA is attributed to ANCA, which causes an immune-mediated vasculitis of small- and medium-sized vessels, primarily affecting the ears, nose, throat, lungs, and kidneys. The primary morbidity of the GPA is related to necrotizing sinusitis, pulmonary capillaritis, and glomerulonephritis. […] The formation of granulomas in GPA begins with the development of neutrophilic microabscesses. The granulomas in GPA ultimately result in partial or total occlusion of blood vessels. The granulomas in GPA are not well-formed, unlike the ones in sarcoidosis or tuberculosis, and consist of giant cells surrounded by plasma cells, lymphocytes, and dendritic cells. These cells can damage the submucosa and penetrate the surrounding tissues, cartilage, or bone, resulting in necrosis and permanent deformities.

• #2 Granulomatosis With Polyangiitis | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/76416

  Several complex interactions involving genetics and microbes have been implicated in the etiology of GPA. The presumption that ANCAs are responsible for inflammation in GPA is now widely accepted. Defective immune-regulatory responses to environmental factors, such as infection or autoantigens, can lead to excessive production of cytokines, which in turn may develop inflammatory granulomatous vascular lesions. […] Understanding the 2 primary types of ANCAs—anti-proteinase 3 (PR3) and anti-myeloperoxidase (MPO)—is crucial for comprehending the disease process. Some studies suggest that the specific type of ANCA may have better prognostic value compared to the clinical presentation of the disease. ANCA in GPA typically reacts with PR3, a serine proteinase prevalent in neutrophil granulocytes. When ANCA binds to PR3, it activates neutrophils, increasing their adherence to the endothelium and triggering degranulation, which can damage endothelial cells.

• #2 Granulomatosis With Polyangiitis | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/76416

  Neutrophils from GPA patients are more likely to produce neutrophil extracellular traps and exhibit lower DNAse I activity, leading to decreased clearance of neutrophil extracellular traps. Neutrophil extracellular traps are composed of decondensed chromatin and intracellular granules that capture cell components. Anti-PR3 binds to neutrophils, leading to degranulation, reactive oxygen species, adhesion to endothelial cells, and secretion of pro-inflammatory cytokines, especially interleukin-8. […] The etiology of GPA is attributed to ANCA, which causes an immune-mediated vasculitis of small- and medium-sized vessels, primarily affecting the ears, nose, throat, lungs, and kidneys. The primary morbidity of the GPA is related to necrotizing sinusitis, pulmonary capillaritis, and glomerulonephritis.

• #2 Granulomatosis With Polyangiitis | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/76416

  The formation of granulomas in GPA begins with the development of neutrophilic microabscesses. The granulomas in GPA ultimately result in partial or total occlusion of blood vessels. The granulomas in GPA are not well-formed, unlike the ones in sarcoidosis or tuberculosis, and consist of giant cells surrounded by plasma cells, lymphocytes, and dendritic cells. These cells can damage the submucosa and penetrate the surrounding tissues, cartilage, or bone, resulting in necrosis and permanent deformities. […] A significant overlap exists between the 3 ANCA-associated vasculitides, particularly GPA and MPA. MPA is a necrotizing vasculitis primarily involving small vessels and is less likely to involve the upper airways; pathology does not demonstrate granulomas. MPA is associated with pulmonary fibrosis, a condition that is rare in GPA.

• #3 Pathology Outlines – Granulomatosis with polyangiitis (GPA)

  https://www.pathologyoutlines.com/topic/lungnontumorgranulomatosiswithpolyangiitis.html

  Granulomatosis with polyangiitis (GPA) is a systemic autoimmune vasculitis syndrome commonly involving the lower respiratory tract, the upper respiratory tract and the kidney. Characterized by a necrotizing vasculitis and a systemic granulomatous inflammatory process which replaces the involved tissues. […] Exact pathophysiology is unclear and pathogenesis is likely multifactorial. […] Exact mechanism is unclear. Thought to be a result of exposure to infectious, environmental or drug induced triggers in patients with predisposing genetic background. Recent discoveries suggest excessive activation of neutrophils that form neutrophil extracellular traps (NETs). Excessive NET formation is involved in ANCA mediated vascular injury and production of ANCA themselves. Viscous cycle of NET formation and ANCA production is thought to drive GPA pathogenesis.

• #4 Granulomatosis with Polyangiitis (GPA) | STROKE MANUAL

  https://www.stroke-manual.com/granulomatosis-with-polyangiitis-gpa/

  the exact cause of GPA is unknown […] a cellular component and a role of autoantibodies are presumed […] ANCA antibodies are present in most patients with GPA (80-90% in active multisystemic disease); however, ANCA-negative cases have been documented […] cytoplasmic ANCA (c-ANCA) reacts with the serine proteinase 3 and causes endothelial injury through the activation of neutrophils […] other contributing factors include: genetic factors, infection (as an initiating factor for inflammation), some medications (phenytoin, antithyroid drugs, allopurinol) […] the granulomas are not well-formed (unlike those seen in sarcoidosis) and consist of giant cells surrounded by plasma cells, lymphocytes, and dendritic cells […] these cells can damage the submucosa and penetrate the surrounding tissue, cartilage, or bone, causing necrosis and permanent deformities […] granulomas may ultimately result in stenosis or arterial occlusion.

• #5 Granulomatosis with Polyangiitis (GPA) – Musculoskeletal and Connective Tissue Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/musculoskeletal-and-connective-tissue-disorders/vasculitis/granulomatosis-with-polyangiitis-gpa

  Granulomatosis with polyangiitis is characterized by necrotizing granulomatous inflammation, small- and medium-sized vessel vasculitis, and focal necrotizing glomerulonephritis, often with crescent formation. […] The cause of GPA is unknown, although immunologic mechanisms play a role. Most patients with active generalized disease have antineutrophil cytoplasmic antibodies (ANCA). […] Characteristically, granulomas form with histiocytic epithelioid cells and often with multinucleated giant cells. Plasma cells, lymphocytes, neutrophils, and eosinophils are also present. Inflammation affects tissues as well as vessels; vasculitis may be a small or large component of the disease. Micronecrosis, usually with neutrophils (microabscesses), occurs early. Micronecrosis progresses to macronecrosis. A central area of necrosis (called geographic necrosis) is rimmed by lymphocytes, plasma cells, macrophages, and multinucleated giant cells. A zone of fibroblastic proliferation with palisading histiocytes may surround the area.

• #5 Granulomatosis with Polyangiitis (GPA) – Musculoskeletal and Connective Tissue Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/musculoskeletal-and-connective-tissue-disorders/vasculitis/granulomatosis-with-polyangiitis-gpa

  In the kidneys, the most common finding is a pauci-immune crescentic focal glomerulonephritis with necrosis and thrombosis of individual loops or larger segments of the glomerulus. […] Serologic testing to detect antineutrophil cytoplasmic antibodies (ANCA) is followed by enzyme-linked immunosorbent assay (ELISA) to check for specific antibodies. Most patients with active disease have cytoplasmic ANCA (c-ANCA), with antibodies against proteinase-3 (PR3); these findings plus characteristic clinical findings suggest GPA. […] A positive ANCA test does not exclude mycobacterial and fungal infections; thus, patients with positive ANCA results and cavitary lung lesions still require bronchoscopy and adequate cultures and other tests for tuberculosis and fungal infections. […] Biopsy should be done if possible to confirm the diagnosis of GPA. Clinically abnormal sites may be biopsied first. Biopsy of affected lung tissue is most likely to reveal characteristic findings; open thoracotomy provides the best access. Biopsies of lung or sinus tissue are cultured to exclude infection. Renal biopsy that shows pauci-immune necrotizing focal crescentic or noncrescentic glomerulonephritis strongly supports the diagnosis.

• #6 Granulomatosis with Polyangiitis (Wegener’s Granulomatosis) | Thoracic Key

  https://thoracickey.com/granulomatosis-with-polyangiitis-wegeners-granulomatosis/

  GPA is considered an autoimmune inflammatory disease. Defining its pathogenic mechanisms has advanced enormously within the past three decades, especially since the discovery of ANCA in 1985. However, the primum movens of the disease remain(s) to be identified. The hypothesis of an infectious agent, such as Staphylococcus aureus, (over)activating the immune system has been repeatedly suggested. Chronic nasal carriage of S. aureus is considered a risk factor for relapse, as is observed in some but not all patients and shown in one study, possibly by maintaining a local inflammatory immune response within the nasal mucosa. A selective cross-reactivity of T cells towards PR3 and S. aureus antigens has been suggested. The experimental model of Pendergraft et al. suggested that some antigenic motives of S. aureus have a molecular similarity with the protein synthesized from the complementary DNA segment coding for human PR3, which can trigger the production of antibodies against PR3 by a protein-complementary idiotype-anti-idiotype mechanism. The S. aureus infection found in GPA patients is not from a particular strain and does not produce specific toxins or lead to a specific T-cell repertoire selection through superantigenic mechanisms. Other organisms could also be involved. Recently, anti-lysosomal membrane protein 2 (anti-LAMP2), another and newer type of ANCA, was detected by Kain and colleagues in more than 90 % of patients with ANCA-related (anti-PR3 as well as anti-MPO) glomerulonephritis. This group further showed the LAMP-2 epitope with 100 % homology to the bacterial adhesin FimH located at the tip of type 1 fimbriae and crucial for attachment to host epithelia of Gram-negative pathogens such as Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis. In addition, pauci-immune glomerulonephritis developed in rats immunized with FimH. However, those results have not been replicated and thus remain controversial. Whatever the signal for their synthesis, PR3-ANCA are detected in more than 80 % of patients with generalized GPA. However, their pathogenic role is less well documented than that of pANCA anti-MPO (most characteristic of microscopic polyangiitis). Until recently, convincing animal models of vasculitis associated with anti-PR3 ANCA were lacking as compared with those associated with anti-MPO. In the mouse model of Pfister et al., vasculitis induced by transfer of anti-PR3 ANCA remained localized to the mouse footpads, was not granulomatous and required prior sensitization with subcutaneous injections of tumor necrosis factor a (TNF-). In the BALB/c murine model of Pendergraft et al., mice did not develop overt vasculitis. More recently, two murine models of anti-PR3 ANCA-associated vasculitis have been developed and are more convincing but require specific genetic backgrounds and prior subtle and complicated immune manipulations (including the humanization of the mouse immune system because of the lack of PR3 expression in murine neutrophils and low human and murine PR3 homology). Specific alterations and maturation may be necessary for anti-PR3 ANCA to become pathogenic, including the selection of higher-affinity ANCA in the nasal mucosa granulomas or modulation of their sialylation levels. Although the pathogenicity of anti-PR3 ANCA remains difficult to demonstrate, results from recent studies of therapies targeting B cells (i.e., rituximab) provide indirect evidence for their potential role, unless these biologic agents act through other more complex pathways. Other factors or mechanisms involved in GPA can favor or enhance the PR3-anti-PR3 ANCA immune response or act independently. Besides the frequent functional and/or genetic deficit in -1-antitrypsin, the physiological inhibitor of PR3, overexpression of PR3 on the neutrophil membrane, genetically determined, has also been reported. More recently, circulating microparticles derived from platelets, neutrophils or endothelial cells, as well as neutrophil extracellular traps (cellular activation debris produced in response to inflammatory signals), were found to express PR3 and MPO, thus perpetuating the presentation of self-antigens, and could trigger or increase inflammatory responses in endothelia, especially in kidneys. GPA has been associated with excess production of certain soluble factors of stimulation and proliferation of B lymphocytes (B-cell activating factor of the TNF family, also called B-lymphocyte stimulator). In parallel, functional abnormalities of the regulatory T lymphocytes CD4+ CD25+ FoxP3+ and abnormal expression of certain T-cell co-stimulatory molecules, including increased membrane expression of CTLA4, can lead to rupture of immune tolerance mechanisms. The binding of ANCA results in activation of the alternative complement pathway and production of reactive oxygen species by neutrophils, all of which lead to endothelial injury (depletion of neutrophils or blockade of complement pathway both prevent the development of anti-MPO-induced vasculitis in experimental models). Granuloma formation, an important histologic characteristic of GPA, involves lymphocyte subpopulations, with a preferential cytokine secretion profile of TH1 lymphocytes (interferon-gamma), but also other complex cytokine imbalances, cell populations or immune pathways of more recent discovery, such as TH17 lymphocytes, a source of IL-17, dendritic or natural killer cells. Functional abnormalities of endothelial cells have been described, and serum autoantibodies against endothelial cells have been found in some patients.

• #7 Granulomatosis with Polyangiitis (GPA, formerly Wegener Granulomatosis): Practice Essentials, Background, Etiology

  https://emedicine.medscape.com/article/332622-overview

  The discovery of ANCAs within neutrophils in the majority of patients with GPA suggested the role of humoral autoimmunity. GPA is usually associated with the presence of diffuse staining cytoplasmic ANCA (C-ANCA) directed against serine proteinase 3 antigen (PR3-ANCA), the so-called Wegener autoantigen. A pathogenic role for PR3-ANCAs in GPA has been proposed, because PR3-ANCA is strongly associated with the disease; over 90% of GPA patients have been reported to have ANCA positivity during active disease. […] Evidence also comes from in vitro studies. The in vitro effects of PR3-ANCA described to date include activation of primed neutrophils, leading to production of reactive oxygen species, and release of lytic enzymes such as elastase and PR3, which act to promote tissue injury. In vivo experimental studies have demonstrated a pathogenic role for MPO-ANCA in mice and rat models. MPO-ANCA induces a pauci-immune necrotizing glomerulonephritis and hemorrhagic capillaritis in these animal models. Neutrophils, as well as the complement system, are necessary for lesion development. […] Despite this in vivo evidence for a pathogenic role of MPO-ANCA in AAV-like syndromes in animal models, no definitive in vivo evidence has yet been found for PR3-ANCA. Further research is necessary to further elaborate its role in GPA.

• #8 Orphanet: Granulomatosis with polyangiitis

  https://www.orpha.net/en/disease/detail/900

  The pathogenesis of GPA is still under study. Genetic susceptibility factors, environmental agents, infectious episodes and anomalies in innate and adaptive immunity seem to play a role in the development of all ANCA-associated vasculitides. […] Genetic variants appear to correlate with antineutrophil cytoplasmic antibody (ANCA) antigen specificity rather than with clinical phenotype. Thus, cytoplasmic-ANCAs directed to proteinase 3 (PR3-ANCA), found in 60-80% of GPA cases, are associated with genetic variants in HLA-DP1A and HLA-DP1B (6p21.32) which encode a class II major histocompatibility complex, SERPINA1 (14q32.13) encoding alpha-1 antitrypsin, and PRTN3 (19p13.3) encoding the autoantigen proteinase 3.

• #9 Granulomatosis with Polyangiitis (GPA) – Johns Hopkins Vasculitis Center

  https://www.hopkinsvasculitis.org/types-vasculitis/granulomatosis-with-polyangiitis/

  Granulomatosis with Polyangiitis is a disease involving granulomatous inflammation, necrosis and vasculitis that most frequently targets the upper respiratory tract, lower respiratory tract, and kidneys. […] The cause of Granulomatosis with Polyangiitis is not known. Compared to diseases with obvious genetic predispositions, genetics appear to play a relatively small role in the etiology of Granulomatosis with Polyangiitis. […] A novel group of autoantibodies, ANCAs, helps support the diagnosis of Granulomatosis with Polyangiitis and related forms of vasculitis and gives insight into the pathogenesis of these diseases. ANCAs are directed against enzymes contained in primary granules of neutrophils and monocytes. […] Studies show that when neutrophils are exposed to cytokines such as tumor necrosis factor, small amounts of serine proteinase and myeloperoxidase, the targets for ANCAs, are expressed on the surface of neutrophils. Adding ANCAs to these cytokine-primed neutrophils causes them to generate oxygen radicals and release enzymes capable of damaging blood vessels.

• #9 Granulomatosis with Polyangiitis (GPA) – Johns Hopkins Vasculitis Center

  https://www.hopkinsvasculitis.org/types-vasculitis/granulomatosis-with-polyangiitis/

  The diagnosis of Granulomatosis with Polyangiitis is established most securely by biopsy specimens showing the triad of vasculitis, granulomata, and large areas of necrosis (known as geographic necrosis) admixed with acute and chronic inflammatory cells. […] Untreated Granulomatosis with Polyangiitis is fatal. Prednisone may slow progression of the disease but by itself is insufficient to arrest the disease.

• #10

  https://link.springer.com/article/10.1007/s40123-019-0176-8

  Granulomatosis with polyangiitis (GPA) is a rare systemic autoimmune disease of unknown etiology that is characterized by granulomatous inflammation, tissue necrosis, and vasculitis in small- and medium-sized vessels. […] Although the pathogenesis of GPA remains unknown, attempts to identify its etiology have been made and have focused on the roles of genetic, immunologic, and environmental factors as well as microbial pathogens. […] The predominance of GPA in Caucasians may indicate that genetic factors contribute to the pathogenesis of the disease. […] The interaction between cellular and humoral immunity is believed to contribute to the disease process. […] Environmental etiologic factors that have been associated with GPA include dust inhalation, exposure to silica, pollution, smoking, metals, chemicals, and medicines such as hydralazine, phenytoin, sulfasalazine, antithyroid medication, and allopurinol.

• #11 Granulomatosis with polyangiitis – Wikipedia

  https://en.wikipedia.org/wiki/Granulomatosis_with_polyangiitis

  Granulomatosis with polyangiitis (GPA), formerly known as Wegener’s granulomatosis, is a rare, long-term, systemic disorder that involves the formation of granulomas and inflammation of blood vessels (vasculitis). It is an autoimmune disease and a form of vasculitis that affects small- and medium-sized vessels in many organs, but most commonly affects the upper respiratory tract, lungs, and kidneys. […] The cause of GPA is unknown, although microbes, such as bacteria and viruses, as well as genetics, have been implicated in its pathogenesis. […] Classic microscopic features of GPA include inflammation of blood vessels associated with poorly formed granulomas, necrosis, and many giant cells. Bacterial colonization with Staphylococcus aureus has been hypothesized as an initiating factor of the autoimmunity seen in people with GPA.

• #12

  https://journals.lww.com/md-cases/fulltext/2022/11000/granulomatosis_with_polyangiitis_presenting_with.2.aspx

  Granulomatosis with polyangiitis (GPA), also known as Wegener granulomatosis, is an uncommon immunologically mediated systemic small-vessel vasculitis that primarily affects the upper and lower respiratory tract and kidneys. The cause of this disease is unknown but is due to a combination of genetic and environmental factors. Genetic factors may be related to defective immune regulation of autoantigens. Environmental factors, such as infection with S aureus, may trigger vasculitis. Other environmental factors included silica exposure, hydrocarbon exposure, pesticides, and drugs. GPA lesions mainly affect the capillaries, tiny veins, and microarteries. It mainly involves the upper and lower respiratory tracts and kidneys. […] Laboratory tests for GPA lack specificity. PR3-ANCAs are a serological hallmark of small-vessel vasculitis, particularly GPA. Studies have shown that PR3 acts as a red flag expressed on the surface of apoptotic cells and is responsible for producing an inflammatory microenvironment. Neutrophil apoptosis in patients with GPA is associated with PR3 overexpression. Therefore, PR3 is highly specific to GPA and has high diagnostic value.

• #13 Take a look at the Recent articles

  https://www.oatext.com/Granulomatosis-with-Polyangiitis-GPA-Case-Report-Outlining-the-Importance-of-Urinalysis-in-Patients-Presenting-with-Pulmonary-Cavitary-Lesions.php

  In animal models, anti-PR3 has been identified as a component within cytoplasmic granules of neutrophils. In GPA, neutrophils may be activated by outlying agents such as cytokines, tumor necrosis factor, and the Fc portion of IgG4 antibodies to catalyze a respiratory burst. This process triggers a cascade of reactions which results in neutrophil aggregation with monocytes and T-cells, resulting in the formation of granulomas. […] Recently, Lysosomal Membrane Protein 2 (LAMP-2) antibodies have been identified to represent a subtype of ANCA antibodies and may be important in the pathogenesis of ANCA associated vasculitis. LAMP-2 is a glycosylated membrane protein which is located on the membranes of anti-PR3 containing intracellular vesicles, as well as neutrophil outer membranes and endothelium. […] Kain et al found that LAMP-2 has 100% homology with a portion of bacterial fimbriae, FimH, which may play a key role in endothelial destruction following infection.

• #14 The Classification & Diagnosis of Granulomatosis with Polyangiitis – The Rheumatologist

  https://www.the-rheumatologist.org/article/the-classification-diagnosis-of-granulomatosis-with-polyangiitis/

  The diagnosis of GPA is based on the patients clinical presentation and supporting laboratory and histologic findings. However, no well-established diagnostic rules or criteria exist. A positive ANCA is not required to diagnose GPA, and diseases that present similarly to a small vessel vasculitis must be excluded.

• #15 The Classification & Diagnosis of Granulomatosis with Polyangiitis – Page 6 of 8 – The Rheumatologist

  https://www.the-rheumatologist.org/article/the-classification-diagnosis-of-granulomatosis-with-polyangiitis/6/?singlepage=1

  The diagnosis of GPA is typically made using clinical judgment by evaluating a patients symptoms together with laboratory and imaging findings while excluding other possible diagnoses, and by observation of improvement on immunosuppressive therapies. […] The renal biopsy demonstrating crescentic necrotizing glomerulonephritis without the immune complex deposits that would be expected in infective endocarditis and the finding of diffuse alveolar hemorrhage on bronchoalveolar lavage both supported GPA over infective endocarditis. […] Ultimately, a combination of findings resulted in the diagnosis of GPA and initiation of immunosuppressive treatment in our patient.

• #16 New Granulomatosis with polyangiitis (Werner’s) treatments 2025 | Everyone.org

  https://everyone.org/explore/treatment/?id=45

  Standard treatment for GPA typically involves a two-phase approach: induction therapy to achieve remission and maintenance therapy to sustain remission and prevent relapse. Induction therapy often involves potent immunosuppressive medications such as corticosteroids combined with cyclophosphamide or rituximab. Maintenance therapy usually includes less aggressive immunosuppressive medications such as azathioprine, methotrexate, or mycophenolate mofetil. […] Initial treatment for GPA usually involves aggressive immunosuppressive therapy aimed at rapidly controlling inflammation and preventing irreversible organ damage. The standard induction therapy typically includes corticosteroids combined with immunosuppressive agents such as cyclophosphamide or rituximab. These medications help suppress the immune system’s abnormal response, thereby reducing inflammation and disease activity.

• #16 New Granulomatosis with polyangiitis (Werner’s) treatments 2025 | Everyone.org

  https://everyone.org/explore/treatment/?id=45

  Cyclophosphamide, historically the cornerstone of induction therapy, is an alkylating agent that effectively suppresses the immune system. However, its use is associated with significant side effects, including increased risk of infections, infertility, and potential long-term malignancy risk. Due to these risks, alternative therapies like rituximab have become increasingly popular. […] Rituximab, a monoclonal antibody targeting CD20-positive B-cells, has demonstrated efficacy comparable to cyclophosphamide in inducing remission in GPA patients. Rituximab is often preferred, particularly in patients who are intolerant to cyclophosphamide or have relapsed disease. Clinical studies have shown that rituximab effectively induces remission and may have a more favorable safety profile compared to cyclophosphamide, particularly regarding fertility preservation and long-term cancer risk.

• #16 New Granulomatosis with polyangiitis (Werner’s) treatments 2025 | Everyone.org

  https://everyone.org/explore/treatment/?id=45

  Ongoing research continues to explore novel therapeutic approaches to GPA, aiming to improve remission rates, minimize side effects, and potentially identify curative strategies. Biologic agents targeting specific immune pathways implicated in GPA pathogenesis are being actively investigated. For example, studies evaluating the efficacy of abatacept, a selective T-cell co-stimulation modulator, and avacopan, a selective complement C5a receptor inhibitor, have shown promising preliminary results in clinical trials. […] Avacopan, in particular, has demonstrated the potential to reduce corticosteroid exposure significantly while maintaining remission rates comparable to standard therapies. If confirmed in larger studies, such therapies may offer safer, more effective alternatives to current treatment regimens, potentially improving long-term outcomes and quality of life for GPA patients.

• #17 Chronic prothrombotic tendency in patients with granulomatosis with polyangiitis – Polish Archives of Internal Medicine

  https://www.mp.pl/paim/issue/article/16027

  Patients with granulomatosis with polyangiitis (GPA) show increased tendency toward thromboembolic phenomena in exacerbation of their disease. […] It has been reported that patients with exacerbated AAV are at increased risk of venous thromboembolic events: about 7 cases per 100 person-years, compared with 0.15 to 0.31 in the general population. […] Consequently, several other reports have confirmed a prothrombotic tendency, especially during the early and exacerbated GPA phase. […] Data on the possible prothrombotic mechanisms in GPA are scarce. Endothelial cell dysfunction, a feature of AVV, can lead to an interaction between neutrophils (activated by tumor necrosis factor and ANCA) and endothelial cells, with the subsequent massive oxidative stress finally leading to atherothrombotic complications.

• #17 Chronic prothrombotic tendency in patients with granulomatosis with polyangiitis – Polish Archives of Internal Medicine

  https://www.mp.pl/paim/issue/article/16027

  The association between exacerbated disease and thromboembolism suggests the involvement of mechanisms at the crossroads of thrombosis and inflammation-thromboinflammation. […] For this reason, we decided to assess thrombin generation using calibrated automated thrombography (CAT) together with plasma fibrinolytic activity measured by plasma CLT in patients with GPA. […] To the best of our knowledge, our study is the first to show that patients with GPA have elevated thrombin generation as well as impaired fibrinolysis, both in exacerbation and in remission. […] Our findings may explain major prothrombotic mechanisms leading to thrombosis in GPA involving both increased thrombin generation and impaired fibrinolysis. […] Exact mechanisms probably involve multiple pathways, activated by autoimmune inflammation and tightly related to the activation and dysfunction of endothelial cells with an initiation and propagation of thrombosis. […] In summary, our study shows that in patients with GPA, there is evidence of hypercoagulability which extends from exacerbation to its more prolonged remission phase, which might persistently increase the risk of thromboembolism.

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