Complement 3 Glomerulopathy Market Summary

Complement 3 Glomerulopathy (C3G) Insights and Trends

• C3G presents with various glomerulonephritis patterns, including membranoproliferative, mesangial proliferative, diffuse endocapillary proliferative, and crescentic types.
• Two forms of C3G have been found through several secondary sources, namely Dense Deposit Disease (DDD) and C3 Glomerulonephritis (C3GN), which vary as per the patterns of damage and inflammation in the glomeruli. In addition, it is important to note that the features of DDD tend to appear earlier than those of C3GN, usually in adolescence.
• C3G is associated with a challenging long-term outlook, driven by its progressive course and high risk of recurrence. Approximately 30–50% of patients develop End-stage Kidney Disease (ESKD) within 10 years of diagnosis.
• The diagnosed prevalent population of C3G in the 7MM is expected to grow between 2025 and 2036, driven by advancements in complement biology and enhanced diagnostic capabilities. Greater use of genetic testing, complement assays, and renal biopsy interpretation supported by multidisciplinary collaboration is enabling earlier and more accurate diagnosis.
• The management of C3G is predominantly reliant on off-label use of various prescription drugs, reflecting the unmet need for approved, targeted therapies. Current treatment options include immunosuppressants, corticosteroids, Renin Angiotensin Aldosterone System (RAAS) inhibitors, and other supportive agents such as calcineurin inhibitors and antibodies.
• Additional off-label treatments include monoclonal antibodies such as eculizumab and rituximab. These antibodies specifically target the terminal complement pathway by inactivating C5, which can improve renal function and reduce proteinuria.
• FABHALTA became the first therapy approved for the treatment of C3G, followed by EMPAVELI/ASPAVELI from Apellis Pharmaceuticals and Sobi. However, a significant challenge remains in the form of a black box warning for life-threatening infections caused by encapsulated organisms (e.g., Neisseria meningitidis, Streptococcus pneumoniae, and Haemophilus influenzae type b) and necessitating vaccination at least 2 weeks before treatment initiation.
• EMPAVELI/ASPAVELI presents a promising therapeutic option for C3G by targeting C3 directly and proximally within the complement cascade. It has demonstrated notable clinical efficacy, nearly doubling the outcomes observed with FABHALTA, thereby distinguishing itself in terms of therapeutic effectiveness.
• Emerging therapies targeting novel mechanisms such as dual complement inhibitors (C5 and Factor H (KP104), MASP-3 inhibitors (Zaltenibart), RNA interference (RNAi) therapeutics targeting complement C3 (ARO-C3), and others are showing promise as potential treatment options.

Complement 3 Glomerulopathy (C3G) Market size and forecast in the 7MM

• 2036 Projected C3G Market Size: ~USD 1 billion
• C3G Growth Rate (2026–2036): 28% CAGR

DelveInsight's ‘Complement 3 Glomerulopathy (C3G) – Market Insights, Epidemiology and Market Forecast – 2036’ report delivers an in-depth understanding of C3G, historical and forecasted epidemiology, as well as the C3G market trends in the United States, EU4 (Germany, Spain, Italy, and France) and the United Kingdom, and Japan.

The Complement 3 Glomerulopathy (C3G) market report delivers a comprehensive analysis of the current treatment landscape, including standards of care, clinical practices, and evolving therapeutic algorithms. It evaluates, Complement 3 Glomerulopathy (C3G) patient burden trends, revenue & market share dynamics, peak patient share & therapy uptake analysis, and provides an in-depth market size assessment, and growth rate projections (Historical & Forecast 2022–2036) across global regions. The report highlights key unmet medical needs in C3G and maps the competitive and clinical landscape to uncover high-value opportunities, providing a clear outlook on future market growth potential.

Geography Covered

• North America: The United States;
• Europe: Germany, France, Italy, and Spain and the UK;
• Asia-Pacific: Japan

Key Factors Driving the Complement 3 Glomerulopathy (C3G) Market

• Deeper understanding of complement dysregulation has led to more targeted and innovative therapies.
• Widespread use of complement assays, genetic testing, and renal biopsy interpretation is enabling earlier and more accurate diagnoses.
• Increased reporting and retrospective chart reviews in nephrology centres suggest that C3G is more common than previously believed, especially in regions with improved access to specialized diagnostics.
• High progression rates to ESKD and lack of approved therapies highlight strong demand for effective treatments.

Complement 3 Glomerulopathy (C3G) Understanding and Treatment Algorithm

Complement 3 Glomerulopathy (C3G) Overview and Diagnosis

Complement 3 glomerulopathy (C3G), a term established by expert consensus in 2013, refers to a group of rare kidney diseases caused by dysregulation of the alternative complement pathway. It is characterized by predominant C3 deposition in the glomeruli with minimal or absent immunoglobulin, C1q, and C4, making this the key diagnostic feature in patients presenting with glomerulonephritis. Clinically, C3G presents with proteinuria, hematuria, reduced urine output, low blood protein levels, and edema. Due to its rarity, epidemiological estimates remain uncertain. Diagnosis typically requires a kidney biopsy with evaluation through light microscopy, immunofluorescence (showing dominant C3 staining), and electron microscopy, which further classifies the disease into dense deposit disease (DDD) or C3 glomerulonephritis (C3GN); additional assessments include urine and blood tests and glomerular filtration rate (GFR) measurement.Complement 3 Glomerulopathy (C3G) Treatment Landscape

Optimal treatment for C3G has not been established yet, since no treatment has proven effective and beneficial for C3G. All patients diagnosed with C3G should be treated with renoprotective measures, including lifestyle advice, an angiotensin-converting enzyme inhibitor or angiotensin-receptor blocker to control hypertension and proteinuria, and lipid-lowering treatment. Such medication alone has not been shown to protect against progression to end-stage renal disease but may improve the protective effect of immunosuppressive medication. Due to the absence of approved treatment/therapies for C3G, as well as therapies that can attack the cause of C3G, the treatment regimen focuses on slowing the process of kidney damage from C3G. This treatment regimen may include corticosteroids (often called “steroids”), immunosuppressive drugs, ACE inhibitors and ARBs, diet changes, and complement inhibitors.  FABHALTA became the first FDA-approved therapy for C3G, targeting the alternative complement pathway by inhibiting Factor B. It was followed by EMPAVELI/ASPAVELI, a C3 inhibitor offering broader upstream blockade, expanding treatment options for complement-mediated kidney diseases.

Further details related to treatment are provided in the report…

Complement 3 Glomerulopathy (C3G) Unmet Needs

The section “unmet needs of C3G” outlines the critical gaps between the current state of patient care, diagnosis, and the ideal & effective management of the disease. It highlights the obstacles experienced by patients, clinicians, and researchers and identifies potential solutions for future progress.

• Overlap with other glomerulopathies - There is a significant chance of misdiagnosis in C3G due to its similarities with IC-MPGN and lupus nephritis
• Absence of early biomarker - Currently no reliable noninvasive biomarker for early or subclinical detection of C3G
• Limited long-term efficacy data - There is a significant gap in long-term real-world evidence of efficacy
• High disease burden associated with C3G progression - Substantial physical and emotional burden on patients and caregivers

and others…..

Note: Comprehensive unmet needs insights in C3G and their strategic implications are provided in the full report.

Complement 3 Glomerulopathy (C3G) Epidemiology

The disease epidemiology covered in the report provides historical as well as forecasted epidemiology segmented by total diagnosed prevalent population of C3G, type-specific diagnosed prevalent population of C3G, age-specific diagnosed prevalent population of C3G, and total treated cases of C3G in the 7MM market covering the United States, EU4 (Germany, France, Italy, and Spain) and the United Kingdom and Japan from 2022 to 2036.

• In 2025, the diagnosed prevalent population of C3G in the 7MM was around 6,000. This number is expected to rise through 2036, driven by advances in complement biology, improved diagnostics, and wider use of genetic testing, complement assays, and multidisciplinary biopsy evaluation.
• The diagnosed prevalent population of C3G, in the US, was around 3,500 in 2025.
• In 2025, C3G predominantly affected adults in the US, with 90% of the cases, while the paediatrics population accounted for the remaining 10%.
• In Japan, adults are more prevalent in C3G compared to paediatrics.

Complement 3 Glomerulopathy (C3G) Drug Analysis & Competitive Landscape

The C3G drug chapter provides a detailed, market-focused review of approved therapies and the emerging pipeline across Phase I–II clinical trials. It covers mechanism of action, clinical trial data, regulatory approvals, patents, collaborations, strategic partnerships upcoming Key catalyst for each therapy, along with their advantages, limitations, and recent developments. This section offers critical insights into the C3G treatment landscape, supporting market assessment, competitive analysis, and growth forecasting for the C3G market.

Marketed Drugs

Iptacopan (FABHALTA/FABIHARTA): Novartis

Iptacopan is an oral Factor B inhibitor of the alternative complement pathway. In C3G, overactivation of the alternative complement pathway leads to C3 cleavage within the glomeruli, resulting in C3 deposition and inflammation, which are thought to contribute to the pathogenesis of C3G. By binding to Factor B, iptacopan inhibits the alternative pathway.

In April 2025, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) had adopted a positive opinion and recommended granting a marketing authorization for iptacopan for the treatment of adults with C3G.

In March 2025, Iptacopan has received US FDA approval for the treatment of adults with C3G.

Pegcetacoplan (EMPAVELI/ ASPAVELI): Apellis Pharmaceuticals and Sobi

Pegcetacoplan is a targeted C3 therapy designed to regulate excessive activation of the complement cascade, part of the body’s immune system, which can lead to the onset and progression of many serious diseases. It is approved for the treatment of C3G and primary IC-MPGN in the United States. The therapy is also under investigation for other rare diseases like focal segmental glomerulosclerosis (FSGS).

• In January 2026, Sobi announced that the European Commission (EC) has approved pegcetacoplan for the treatment of adult and adolescent patients aged 12 to 17 years with C3G in combination with a renin-angiotensin system (RAS) inhibitor, unless RAS inhibitor treatment is not tolerated or contraindicated.
• In July 2025, the US FDA approved pegcetacoplan as the first treatment for C3G or primary IC-MPGN in patients 12 years of age and older.
• In February 2025, the EMA has validated an indication extension application for pegcetacoplan for the treatment of C3G and primary IC-MPGN.

Complement 3 Glomerulopathy (C3G) Pipeline Analysis

KP104: Kira Pharmaceuticals

KP104 is a potent, first-in-class bifunctional biologic designed to simultaneously and selectively block the alternative and terminal pathways, providing a powerful and synergistic method of targeting validated drivers of complement disease. KP104 is entering Phase II proof-of-concept trials across multiple indications with significant unmet need, including IgAN, C3G, SLE-TMA, and PNH. Phase II trials will be conducted globally, including in the US, China, Australia, and South Korea.

Zaltenibart (OMS906): Omeros Corporation

Zaltenibart is an investigational human monoclonal antibody targeting Mannan-binding lectin-associated Serine Protease-3 (MASP-3), the key and most proximal activator of the complement system’s alternative pathway. Following completion of the Phase II study, and assuming strong evidence of efficacy, Omeros Corporation plans to initiate a Phase III trial in C3G.

Note: Detailed emerging therapies assessment will be provided in the final report.

Complement 3 Glomerulopathy (C3G) Key Players, Market Leaders and Emerging Companies

• Novartis
• Apellis Pharmaceuticals
• Sobi
• Kira Pharmaceuticals
• Novo Nordisk/Omeros Corporation
• Arrowhead Pharmaceuticals, and others

Complement 3 Glomerulopathy (C3G) Drug Updates

• In January 2026, Sobi announced that the European Commission has approved ASPAVELI for the treatment of adult and adolescent patients aged 12 to 17 years with C3G or primary Immune-Complex Membranoproliferative Glomerulonephritis (IC-MPGN) in combination with a Renin-Angiotensin System (RAS) inhibitor, unless RAS inhibitor treatment is not tolerated or contraindicated.
• In June 2025, Apellis Pharmaceuticals presented new data from the open-label period of the Phase III (VALIANT) study, investigating pegcetacoplan for C3G and primary IC-MPGN. The data were presented as part of a late-breaking session at the ERA Congress.

Complement 3 Glomerulopathy (C3G) Market Outlook

The management of C3G is predominantly reliant on off-label use of various prescription drugs, reflecting the unmet need for approved, targeted therapies. Current treatment options include immunosuppressants, corticosteroids, Renin angiotensin aldosterone System (RAAS) inhibitors, and other supportive agents such as calcineurin inhibitors and antibodies.

Additional off-label treatments include calcineurin inhibitors, other immunosuppressive agents, and monoclonal antibodies such as eculizumab and rituximab. These antibodies specifically target the terminal complement pathway by inactivating C5, which can improve renal function and reduce proteinuria. Patients with evidence of terminal pathway activation, indicated by high levels of C5b-9 in circulation and kidney biopsies, may particularly benefit from these therapies, a profile commonly observed in C3G.

The treatment landscape for C3G saw a breakthrough in March 2025 with the FDA approval of Iptacopan, the first targeted therapy for this condition. In July 2025, the FDA approved pegcetacoplan for the treatment of C3G and primary IC-MPGN in patients aged 12 years and older. This marks a significant expansion in targeted therapies for complement-mediated kidney diseases.

• The US accounts for the largest market size of C3G, in comparison to EU4 and the UK, and Japan, i.e., ~70% of the 7MM.
• The emerging pipeline of C3G holds a few significant products in development by prominent key players such as Kira Pharmaceuticals (KP104), Novo Nordisk/Omeros Corporation (Zaltenibart [OMS906]), Arrowhead Pharmaceuticals (ARO-C3), and others. These therapies are expected to create an upward shift in the C3G treatment market after their launch in the coming years, in the 7MM.

Drug Class/Insights into Leading Emerging and Marketed Therapies in Complement 3 Glomerulopathy (C3G) (2022–2036 Forecast)

The C3G market comprises bifunctional fusion proteins, small molecules, RNAi therapeutics, and other, each targeting different aspects of C3.

MASP-3 inhibitor: Zaltenibart is an investigational human monoclonal antibody targeting Mannan-binding Lectin-associated Serine Protease-3 (MASP-3), the key and most proximal activator of the complement system’s alternative pathway. On the other hand, ruxoprubart, an engineered human immunoglobulin, exhibits dual specificity: It blocks only the Alternative Pathway, dysregulated by the disease, and binds Bb, which has no binding to Factor B.

Dual-targeting complement inhibitor (C5 and Factor H): KP104 is a potent, first-in-class bifunctional biologic designed to simultaneously and selectively block the alternative and terminal pathways, providing a powerful and synergistic method of targeting validated drivers of complement disease.

Monoclonal antibodies and small molecules together define the core innovation landscape, with peptides currently commercially validated and small molecules driving pipeline growth.

Complement 3 Glomerulopathy (C3G) Drugs Uptake

This section focuses on the uptake rate of potential drugs expected to be launched in the market during 2026–2036, which depends on the competitive landscape, safety, efficacy data, and order of entry. It is important to understand that the key players evaluating their novel therapies in the pivotal and confirmatory trials should remain vigilant when selecting appropriate comparators to stand the greatest chance of a positive opinion from regulatory bodies, leading to approval, smooth launch, and rapid uptake. Following the approvals of Iptacopan and Pegcetacoplan, the treatment landscape for C3G is rapidly evolving, with several complement-targeted therapies in clinical development. These investigational agents aim to address unmet needs such as long-term kidney preservation, broader patient eligibility (e.g., pediatrics, transplant), and alternative mechanisms of action.

Further detailed analysis of emerging therapies, drug uptake in the report…

Market Access and Reimbursement of Approved therapies in Complement 3 Glomerulopathy (C3G) 

The report provides detailed insights on the country-wise accessibility and reimbursement scenarios, programs making accessibility easier and out-of-pocket costs more affordable, insights on patients insured under federal or state government prescription drug programs, etc. Reimbursement is a crucial factor that affects the drug’s access to the market. Often, the decision to reimburse comes down to the price of the drug relative to the benefit it produces in treated patients. To reduce the healthcare burden of these high-cost therapies, many payment models are being considered by payers and other industry insiders.

FABHALTA Co-pay Plus

• If eligible, Co-pay Plus may help patients pay for their FABHALTA, including refills. Co-pay Plus is not health insurance, but it can help cover out-of-pocket expenses related to their prescription.
• Pay as little as USD 0 with Co-pay Plus
• Eligible patients with private insurance may pay as little as USD 0
• Annual benefit limit of USD 20,000 per calendar year

C3G Therapies Price Scenario & Trends

Pricing and analogue assessment of C3G therapies highlights evolving price dynamics structures. This section summarizes the cost of approved treatments, closest and most approproiate analogue selection for emerging therapies, and understanding of how pricing influences market access, adherence, and long-term uptake.

Pricing of C3G Approved Drugs

EMPAVELI is administered subcutaneously at 1,080 mg (20 mL) twice weekly. Following a 26-week controlled phase, patients may enter a 26-week open-label extension. At USD 4,535.96 per dose (2023 WAC), the estimated annual cost is USD 500,469.

KOL Views

To keep up with the real-world scenario in current and emerging market trends, we take opinions from Key Industry leaders working in the domain through primary research to fill the data gaps and validate our secondary research. Industry Experts contacted for insights on the evolving treatment landscape, patient reliance on conventional therapies, patient therapy switching acceptability, and drug uptake, along with challenges related to accessibility, including Medical/scientific writers, nephrologists, Consultant Nephrologists, and Honorary Associate Professor at University Hospitals of Leicester NHS Trust, and Others.

Delveinsight’s analysts connected with 20+ KOLs to gather insights; however, interviews were conducted with 10+ KOLs in the 7MM. Their opinion helps understand and validate current and emerging therapy treatment patterns or Complement 3 Glomerulopathy market trends.

Qualitative Analysis: SWOT and Conjoint Analysis

• We perform qualitative and market Intelligence analysis using various approaches, such as SWOT analysis and conjoint analysis.
• In the SWOT analysis of Complement 3 Glomerulopathy (C3G), strengths, weaknesses, opportunities, and threats in terms of disease diagnosis, patient awareness, patient burden, competitive landscape, cost-effectiveness, and geographical accessibility of therapies are provided.
• Conjoint analysis analyzes emerging therapies based on relevant attributes such as safety, efficacy, frequency of administration, route of administration, and order of entry. Scoring is given based on these parameters to analyze the effectiveness of therapy.
• The team of analysts analyzes promising emerging therapies based on relevant attributes such as safety, efficacy, frequency of administration, route of administration, and order of entry. In efficacy, the trial’s primary and secondary outcome measures are evaluated, whereas the therapies’ safety is evaluated, wherein the acceptability, tolerability, and adverse events are majorly observed. In addition, the scoring is also based on the route of administration, order of entry, probability of success, and the addressable patient pool for each therapy. According to these parameters, the final weightage score and the ranking of the emerging therapies are decided.

Scope of the Report

• The report covers a segment of key events, an executive summary, a descriptive overview of C3G, explaining their causes, signs and symptoms, pathogenesis, and currently available treatments.
• Comprehensive insight has been provided into the epidemiology segments and forecasts, the future growth potential of the diagnosis rate, and disease progression along treatment guidelines.
• Additionally, an all-inclusive account of both the current and emerging treatments, along with the elaborative profiles of late-stage and prominent therapies, will have an impact on the current treatment landscape.
• A detailed review of the C3G market, historical and forecasted market size, market share by therapies, detailed assumptions, and rationale behind our approach is included in the report, covering the 7MM drug outreach.
• The report provides an edge while developing business strategies by understanding trends through SWOT analysis and expert insights/KOL views, patient journey, and treatment preferences that help in shaping and driving the 7MM C3G market.

Report Insights

• C3G Patient Population Forecast
• C3G Therapeutics Market Size
• C3G Pipeline Analysis
• C3G Market Size and Trends
• C3G Market Opportunity (Current and Forecasted)

Report Key Strengths

• Epidemiology-based (Epi-based) Bottom-up Forecasting
• Artificial Intelligence (AI)-enabled Market Research Report
• 11-year forecast
• C3G Market Outlook (North America, Europe, Asia-Pacific)
• Patient Burden Trends (by geography)
• C3G Treatment Addressable Market (TAM)
• C3G Competitve Landscape
• C3G Major Companies InSIGHTS
• C3G Price Trends and Analogue Assessment
• C3G Therapies Drug Adoption/Uptake
• C3G Therapies Peak Patient Share Analysis

Report Assessment

• C3G Current Treatment Practices
• C3G Unmet Needs
• C3G Clinical Development Analysis
• C3G Emerging Drugs Product Profiles
• C3G Market Attractiveness
• C3G Qualitative Analysis (SWOT and Conjoint Analysis)

FAQs

Market Insights

• What was the C3G market size, the market size by therapies, market share (%) distribution in 2025, and what would it look like by 2036? What are the contributing factors for this growth?
• What are the anticipated pricing variations among different geographies for the emerging therapies in the future?
• What can be the future treatment paradigm of C3G?
• What are the disease risks, burdens, and unmet needs of C3G? What will be the growth opportunities across the 7MM concerning the patient population with C3G?
• Who is the major future competitor in the market, and how will the competitors affect their market share?
• What are the current options for the treatment of C3G? What are the current guidelines for treating C3G in the US, Europe, and Japan?

Reasons to Buy

• The report will help in developing business strategies by understanding the latest trends and changing treatment dynamics driving the C3G market.
• Insights on patient burden/disease incidence, evolution in diagnosis, and factors contributing to the change in the epidemiology of the disease during the forecast years.
• Understand the existing market opportunities in varying geographies and the growth potential over the coming years.
• Identifying strong upcoming players in the market will help devise strategies to help get ahead of competitors.
• Detailed analysis, ranking of class-wise potential current, and emerging therapies under the conjoint analysis section to provide visibility around leading classes.
• To understand KOLs’ perspectives on the accessibility, acceptability, and compliance-related challenges of existing treatment to overcome barriers in the future.
• Detailed insights on the unmet needs of the existing market so that the upcoming players can strengthen their development and launch strategy.
• This Artificial Intelligence (AI) enabled report summarize and simplify complex datasets within the report into clear, actionable insights for stakeholders, investors, and healthcare providers, enabling faster, data driven decisions.