Rapidly Progressive Glomerulonephritis (RPGN)

Rapidly Progressive Glomerulonephritis (RPGN), also called crescentic glomerulonephritis, is a clinical syndrome of acute nephritis with a rapid loss of kidney function over days, weeks or months, together with crescents in many glomeruli on kidney biopsy (crescentic glomerulonephritis is commonly defined as crescents in more than 50% of glomeruli). It is handled as a nephrology emergency: reviews describe kidney damage that becomes irreversible, and can end in dialysis, when diagnosis and treatment are delayed (McAdoo 2017).

Table of Contents

  1. Overview
  2. Epidemiology
  3. Classification: Three Types of RPGN
  4. Pathophysiology
  5. Clinical Presentation
  6. Diagnosis
  7. Serological Workup
  8. Treatment
  9. Type-Specific Treatment
  10. Prognosis
  11. Key Research Papers
  12. Featured Videos

1. Overview

RPGN is defined by the clinical-pathological combination of:

Crescents represent proliferation of parietal epithelial cells (PECs) of Bowman's capsule in response to fibrin leakage through disrupted glomerular capillary walls (necrosis/breaks in GBM). Monocytes and macrophages migrate into the Bowman's space, amplifying proliferation. Initially cellular crescents can evolve to fibrocellular then fibrous crescents (irreversible scarring) within days to weeks, which is why early diagnosis and treatment matter for kidney outcome.

RPGN is classified into three immunopathological types based on the pattern of immunofluorescence (IF) on kidney biopsy — the most important initial test:

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2. Epidemiology

RPGN is uncommon, and the share of each type differs between populations. In Wessex, UK (a stable population of 2.5 million), the incidence of biopsy-proven pauci-immune (Type III) RPGN was 4 per million per year over 10 years, and 73% of these patients were ANCA-positive (Hedger 2000). A 2024 meta-analysis of 47 studies put the incidence of anti-GBM disease (Type I) at 0.60 to 1.79 per million population per year, and found anti-GBM disease in 8.0% of RPGN cases (Kuang 2024). In a single-centre Chinese series of 528 biopsy-proven crescentic GN cases (mean age 37.6 years), 11.6% were Type I, 62.7% Type II (lupus nephritis 34.3%, IgA nephropathy 17.4%) and 25.8% Type III (Chen 2016). In a pooled cohort of 848 patients from seven European ANCA-vasculitis trials, the mean age at diagnosis was 58 years (Sánchez-Álamo 2023). Immune complex RPGN (Type II) occurs across all ages, depending on the underlying condition.

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3. Classification: Three Types of RPGN

Type I — Anti-GBM Disease (Goodpasture Syndrome)

Pathogenesis: Autoantibodies directed against the non-collagenous domain 1 of the alpha-3 chain of type IV collagen [α3(IV)NC1] — expressed in GBM and alveolar basement membrane. The disease is strongly associated with the HLA allele DRB1*15:01 (DR15) (McAdoo 2025). Spatial and temporal clustering of cases supports an environmental trigger such as infection in genetically susceptible people (Canney 2016; McAdoo 2017), and relapses are usually associated with ongoing exposure to lung irritants such as cigarette smoke or hydrocarbons (McAdoo 2025).

Classic Goodpasture syndrome = pulmonary hemorrhage + crescentic GN. Reviews describe concurrent alveolar hemorrhage in 40%–60% of patients (McAdoo 2017); a 2024 meta-analysis pooled the prevalence of lung hemorrhage at 32.6% (Kuang 2024). The remainder have kidney-limited disease.

IF: Linear IgG along the GBM (the "railroad track" pattern).

Type II — Immune Complex GN

Granular "lumpy-bumpy" IgG/IgM/IgA deposits on IF (distinguish from linear Type I and paucity of deposits in Type III).

Causes include:

Type III — Pauci-Immune ANCA-Associated GN

Pauci-immune = few or no immune deposits on IF (despite severe glomerular injury). Associated with antineutrophil cytoplasmic antibodies (ANCA):

Double-positivity (anti-GBM + ANCA): circulating ANCA, usually against MPO, are found in 30%–40% of patients with anti-GBM disease (McAdoo 2025). In a European cohort of 37 double-positive patients, the disease combined features of both conditions (severe kidney disease and frequent lung hemorrhage, but an older age profile); no single-positive anti-GBM patient relapsed, whereas about half of surviving double-positive and ANCA-vasculitis patients had recurrent disease over a median 4.8 years. The authors describe early treatment as for anti-GBM disease, with long-term follow-up and consideration of maintenance immunosuppression as for ANCA vasculitis (McAdoo 2017, Kidney Int).

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4. Pathophysiology

The final common pathway in all three types is disruption of the glomerular capillary wall:

  1. Necrosis/rupture of GBM: fibrin leakage into Bowman's space
  2. Parietal epithelial cell (PEC) proliferation: PECs line Bowman's capsule and are progenitor cells; injury induces rapid proliferation
  3. Monocyte/macrophage recruitment: driven by chemoattractants (MCP-1, IL-8, complement products); monocytes differentiate into macrophages within the crescent
  4. Extracellular matrix deposition: fibronectin, collagen IV, tenascin; early cellular crescents → fibrocellular → fibrous (permanent)
  5. Tubular atrophy: from reduced GFR, ischemia, and protein casts
  6. Interstitial inflammation: CD4+ T-cell infiltration; drives tubular injury

In Type III AAV, ANCA activates primed neutrophils → neutrophil extracellular traps (NETs) → endothelial injury → fibrinoid necrosis; MPO and PR3 released from degranulating neutrophils propagate inflammation and GBM injury.

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5. Clinical Presentation

RPGN presents as a nephritic syndrome with rapid GFR decline:

Type-specific extra-renal features:

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6. Diagnosis

Kidney biopsy is the key test and is done urgently, because cellular crescents can evolve into irreversible fibrous crescents within days to weeks.

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7. Serological Workup

Serology and biopsy are usually pursued at the same time, so that neither waits on the other; a 2025 review calls rapid and accurate diagnosis essential to guide therapy in anti-GBM disease (McAdoo 2025).

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8. Treatment: General Approach

RPGN is treated as a nephrology emergency. A 2025 treatment review of anti-GBM disease states that where clinical suspicion is high and disease is immediately organ- or life-threatening, empirical treatment (for example glucocorticoids and/or plasma exchange) may be started while definitive tests are awaited (McAdoo 2025):

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9. Type-Specific Treatment

Type I (Anti-GBM Disease)

Type II (Immune Complex GN)

Treatment is directed at the underlying cause:

Type III (ANCA-Associated Vasculitis)

Induction therapy — the 2022 EULAR update recommends high-dose glucocorticoids with either rituximab or cyclophosphamide for organ- or life-threatening disease (Hellmich 2024):

PEXIVAS trial (2020): In 704 patients with severe ANCA-associated vasculitis (eGFR <50 ml/min/1.73 m² or diffuse pulmonary hemorrhage), plasma exchange did not reduce the composite of death from any cause or end-stage kidney disease compared with no plasma exchange (28.4% vs. 31.0%; hazard ratio 0.86, P = 0.27). The same trial found a reduced-dose oral glucocorticoid regimen noninferior to the standard-dose regimen for that outcome, with fewer serious infections at 1 year. The 2022 EULAR update states that plasma exchange may be considered in patients with rapidly progressive glomerulonephritis (Hellmich 2024). Plasma exchange remains part of standard treatment for anti-GBM disease (see Type I above).

Maintenance therapy:

Avacopan (C5a receptor antagonist): approved by the US FDA in October 2021 as an adjunctive treatment for adults with severe active ANCA-associated vasculitis (GPA and MPA), in combination with standard therapy including glucocorticoids. The approval rested mainly on the ADVOCATE trial (Jayne et al., NEJM 2021, PubMed PMID: 33596356), whose published report was retracted by the journal on 29 June 2026 (retraction notice PMID 42377355). The European Medicines Agency concluded in June 2026 that the trial was conducted in breach of good clinical practice (GCP) principles and that the study data provided at the time of assessment were “incorrect and misleading”; the EU marketing authorisation was revoked on 4 August 2026 (EMA announcement, 26 June 2026). The FDA’s Drugs@FDA record (NDA 214487) still listed the 2021 approval as of October 2026; whether the FDA has taken any action since the retraction could not be confirmed.

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10. Prognosis

Prognosis depends on the type, kidney function at presentation, and how much of the kidney is already scarred:

Factors linked to a poor kidney outcome include oligoanuria, a high proportion of glomerular crescents and dialysis-dependent kidney failure at presentation in anti-GBM disease (McAdoo 2017), and fewer normal glomeruli and more glomerulosclerosis on biopsy in ANCA vasculitis (Sánchez-Álamo 2024).

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Key Research Papers

  1. Jennette JC. Rapidly progressive crescentic glomerulonephritis. Kidney Int. 2003;63(3):1164–1177. — PubMed PMID: 12631105 · doi:10.1046/j.1523-1755.2003.00843.x
  2. Stone JH, Merkel PA, Spiera R, et al. Rituximab versus cyclophosphamide for ANCA-associated vasculitis (RAVE). N Engl J Med. 2010;363(3):221–232. — PubMed PMID: 20647199 · doi:10.1056/NEJMoa0909905
  3. Jones RB, Tervaert JWC, Hauser T, et al. Rituximab versus cyclophosphamide in ANCA-associated renal vasculitis (RITUXVAS). N Engl J Med. 2010;363(3):211–220. — PubMed PMID: 20647198 · doi:10.1056/NEJMoa0909169
  4. Walsh M, Merkel PA, Peh CA, et al. Plasma Exchange and Glucocorticoids in Severe ANCA-Associated Vasculitis (PEXIVAS). N Engl J Med. 2020;382(7):622–631. — PubMed PMID: 32053298 · doi:10.1056/NEJMoa1803537
  5. Guillevin L, Pagnoux C, Karras A, et al. Rituximab versus azathioprine for maintenance in ANCA-associated vasculitis (MAINRITSAN). N Engl J Med. 2014;371(19):1771–1780. — PubMed PMID: 25372085 · doi:10.1056/NEJMoa1404231
  6. Jayne DRW, Merkel PA, Schall TJ, Bekker P, for the ADVOCATE Study Group. Avacopan for the Treatment of ANCA-Associated Vasculitis. N Engl J Med. 2021;384(7):599–609. — PubMed PMID: 33596356 · doi:10.1056/NEJMoa2023386 — Retracted (retraction notice: PubMed PMID: 42377355)
  7. Levy JB, Turner AN, Rees AJ, Pusey CD. Long-term outcome of anti-glomerular basement membrane antibody disease treated with plasma exchange and immunosuppression. Ann Intern Med. 2001;134(11):1033–1042. — PubMed PMID: 11388816 · doi:10.7326/0003-4819-134-11-200106050-00009
  8. Hudson BG, Tryggvason K, Sundaramoorthy M, Neilson EG. Alport's syndrome, Goodpasture's syndrome, and type IV collagen. N Engl J Med. 2003;348(25):2543–2556. — PubMed PMID: 12815141 · doi:10.1056/NEJMra022296
  9. Pusey CD. Anti-glomerular basement membrane disease. Kidney Int. 2003;64(4):1535–1550. — PubMed PMID: 12969182 · doi:10.1046/j.1523-1755.2003.00241.x
  10. Bomback AS, Appel GB. Pathogenesis of the C3 glomerulopathies and reclassification of MPGN. Nat Rev Nephrol. 2012;8(11):634–642. — PubMed PMID: 23026947 · doi:10.1038/nrneph.2012.213
  11. Sinico RA, Radice A. Antineutrophil cytoplasmic antibodies (ANCA) testing: detection methods and clinical application. Clin Exp Rheumatol. 2014;32(3 Suppl 82):S112–117. — PubMed PMID: 24854381
  12. McAdoo SP, Pusey CD. Anti-Glomerular Basement Membrane Disease. Clin J Am Soc Nephrol. 2017;12(7):1162–1172. — PubMed PMID: 28515156 · doi:10.2215/CJN.01380217
  13. Hellmich B, Sanchez-Alamo B, Schirmer JH, et al. EULAR recommendations for the management of ANCA-associated vasculitis: 2022 update. Ann Rheum Dis. 2024;83(1):30–47. — PubMed PMID: 36927642 · doi:10.1136/ard-2022-223764
  14. McAdoo SP, Pusey CD. Anti-glomerular basement membrane disease—treatment standard. Nephrol Dial Transplant. 2025;41(1):42–54. — PubMed PMID: 40973182 · doi:10.1093/ndt/gfaf190
  15. McAdoo SP, Tanna A, Hrušková Z, et al. Patients double-seropositive for ANCA and anti-GBM antibodies have varied renal survival, frequency of relapse, and outcomes compared to single-seropositive patients. Kidney Int. 2017;92(3):693–702. — PubMed PMID: 28506760 · doi:10.1016/j.kint.2017.03.014
  16. Kuang H, Jiang N, Jia XY, et al. Epidemiology, clinical features, risk factors, and outcomes in anti-glomerular basement membrane disease: a systematic review and meta-analysis. Autoimmun Rev. 2024;23(4):103531. — PubMed PMID: 38493958 · doi:10.1016/j.autrev.2024.103531
  17. Canney M, O'Hara PV, McEvoy CM, et al. Spatial and temporal clustering of anti-glomerular basement membrane disease. Clin J Am Soc Nephrol. 2016;11(8):1392–1399. — PubMed PMID: 27401523 · doi:10.2215/CJN.13591215
  18. Hedger N, Stevens J, Drey N, et al. Incidence and outcome of pauci-immune rapidly progressive glomerulonephritis in Wessex, UK: a 10-year retrospective study. Nephrol Dial Transplant. 2000;15(10):1593–1599. — PubMed PMID: 11007827 · doi:10.1093/ndt/15.10.1593
  19. Chen S, Tang Z, Xiang H, et al. Etiology and outcome of crescentic glomerulonephritis from a single center in China: a 10-year review. Am J Kidney Dis. 2016;67(3):376–383. — PubMed PMID: 26388283 · doi:10.1053/j.ajkd.2015.07.034
  20. Sánchez-Álamo B, Moi L, Bajema I, et al. Long-term outcome of kidney function in patients with ANCA-associated vasculitis. Nephrol Dial Transplant. 2024;39(9):1483–1493. — PubMed PMID: 38268409 · doi:10.1093/ndt/gfae018
  21. Sánchez Álamo B, Moi L, Bajema I, et al. Long-term outcomes and prognostic factors for survival of patients with ANCA-associated vasculitis. Nephrol Dial Transplant. 2023;38(7):1655–1665. — PubMed PMID: 36617233 · doi:10.1093/ndt/gfac320
  22. de Groot K, Harper L, Jayne DR, et al. Pulse versus daily oral cyclophosphamide for induction of remission in antineutrophil cytoplasmic antibody-associated vasculitis (CYCLOPS). Ann Intern Med. 2009;150(10):670–680. — PubMed PMID: 19451574 · doi:10.7326/0003-4819-150-10-200905190-00004
  23. Jayne D, Rasmussen N, Andrassy K, et al. A randomized trial of maintenance therapy for vasculitis associated with antineutrophil cytoplasmic autoantibodies (CYCAZAREM). N Engl J Med. 2003;349(1):36–44. — PubMed PMID: 12840090 · doi:10.1056/NEJMoa020286
  24. Rodriguez-Iturbe B, Musser JM. The current state of poststreptococcal glomerulonephritis. J Am Soc Nephrol. 2008;19(10):1855–1864. — PubMed PMID: 18667731 · doi:10.1681/ASN.2008010092
  25. Furie R, Rovin BH, Houssiau F, et al. Two-year, randomized, controlled trial of belimumab in lupus nephritis (BLISS-LN). N Engl J Med. 2020;383(12):1117–1128. — PubMed PMID: 32937045 · doi:10.1056/NEJMoa2001180
  26. Rovin BH, Teng YKO, Ginzler EM, et al. Efficacy and safety of voclosporin versus placebo for lupus nephritis (AURORA 1): a double-blind, randomised, multicentre, placebo-controlled, phase 3 trial. Lancet. 2021;397(10289):2070–2080. — PubMed PMID: 33971155 · doi:10.1016/S0140-6736(21)00578-X
  27. Kavanagh D, Bomback AS, Vivarelli M, et al. Oral iptacopan therapy in patients with C3 glomerulopathy (APPEAR-C3G): a randomised, double-blind, parallel group, multicentre, placebo-controlled, phase 3 study. Lancet. 2025;406(10512):1587–1598. — PubMed PMID: 41016405 · doi:10.1016/S0140-6736(25)01148-1

PubMed Topic Searches

  1. PubMed: Rapidly progressive glomerulonephritis crescentic treatment
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  5. PubMed: Avacopan ANCA vasculitis ADVOCATE trial
  6. PubMed: Lupus nephritis crescentic glomerulonephritis
  7. PubMed: MAINRITSAN rituximab vasculitis maintenance

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