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Last Updated: April 3, 2026

CLINICAL TRIALS PROFILE FOR PEGASYS


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All Clinical Trials for PEGASYS

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00047879 ↗ Phase II Trial of Peginterferon Alpha-2b and Thalidomide in Adults With Recurrent Gliomas Completed National Cancer Institute (NCI) Phase 2 2002-10-01 This study will examine the safety and effectiveness of peginterferon alpha-2b (PEG-Intron) alone and together with thalidomide in patients with gliomas (a type of brain tumor). Gliomas are nourished by blood delivered through blood vessels whose formation is stimulated by substances produced by the tumor itself. Stopping the growth of new vessels can slow or prevent tumor growth. The Food and Drug Administration has approved various interferons for treating several diseases, including melanoma and some leukemias. These drugs block new vessel growth in patients with recurrent tumors, but in high doses they produce serious side effects. Therefore, this study will use a low dose of PEG-Intron given weekly instead of high doses given several times a week. Thalidomide, currently approved to treat leprosy, also blocks development of new blood vessel formation. In a recent study of thalidomide given to 36 patients with gliomas, 4 patients had tumor shrinkage, 12 had stable disease for at least 2 months, and at least 3 had responses to treatment lasting 6 to 14 months. Patients 18 years of age and older with a primary glioma whose tumor has recurred or is growing following standard treatment and does not respond to radiation therapy may be eligible for this study. Candidates will be screened with a physical examination, blood and urine tests (including a pregnancy test for women of childbearing potential), and magnetic resonance imaging (MRI) or computed tomography (CT) of the head. Patients will continue treatment cycles as long as the drug is tolerated without serious side effects and the tumor is not growing. While on the study, patients will undergo various tests and procedures as follows: Physical and neurologic examinations every 6 weeks MRI or CT brain scan every 6 weeks to assess tumor status. MRI is a diagnostic test that uses a strong magnetic field and radio waves to show structural and chemical changes in tissues. During the scan, the patient lies on a table in a narrow cylinder containing a magnetic field. He or she can speak with a staff member through an intercom system at all times during the procedure.
NCT00048945 ↗ Efficacy and Safety Study of Pegasys in the Treatment of Chronic Hepatitis B Completed Hoffmann-La Roche Phase 3 2002-01-01 The purpose of this study is to determine the safety and efficacy of Pegasys + placebo + lamivudine versus lamivudine alone in patients with lamivudine versus lamivudine alone in patients with hepatitis B antigen CHB.
NCT00056862 ↗ Low-Dose Peginterferon and Ribavirin to Treat Chronic Hepatitis C in Patients Infected With HCV Genotype 2 or 3 Completed National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) Phase 4 2003-03-01 This study will examine the effectiveness of low-dose peginterferon and ribavirin therapy for certain patients with chronic hepatitis C-a liver disease that, in some patients, can progress to cirrhosis of the liver, liver cancer, and liver failure.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for PEGASYS

Condition Name

Condition Name for PEGASYS
Intervention Trials
Hepatitis C, Chronic 87
Hepatitis C 57
Chronic Hepatitis C 35
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Condition MeSH

Condition MeSH for PEGASYS
Intervention Trials
Hepatitis 280
Hepatitis A 246
Hepatitis C 212
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Clinical Trial Locations for PEGASYS

Trials by Country

Trials by Country for PEGASYS
Location Trials
Canada 171
Australia 95
Italy 93
Germany 91
Spain 82
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Trials by US State

Trials by US State for PEGASYS
Location Trials
California 95
Texas 89
New York 75
Florida 70
North Carolina 63
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Clinical Trial Progress for PEGASYS

Clinical Trial Phase

Clinical Trial Phase for PEGASYS
Clinical Trial Phase Trials
Phase 4 94
Phase 3 67
Phase 2/Phase 3 10
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Clinical Trial Status

Clinical Trial Status for PEGASYS
Clinical Trial Phase Trials
Completed 241
Unknown status 30
Terminated 24
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Clinical Trial Sponsors for PEGASYS

Sponsor Name

Sponsor Name for PEGASYS
Sponsor Trials
Hoffmann-La Roche 114
Bristol-Myers Squibb 22
Vertex Pharmaceuticals Incorporated 18
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Sponsor Type

Sponsor Type for PEGASYS
Sponsor Trials
Industry 259
Other 216
NIH 14
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Clinical Trials Update, Market Analysis, and Projection for PEGASYS

Last updated: January 30, 2026


Summary

Pegasys (peginterferon alfa-2a) is a biotech drug developed by Hoffmann-La Roche, primarily used to treat chronic hepatitis B and C infections. While a well-established drug in the antiviral segment, ongoing clinical developments, market dynamics, and regulatory shifts influence its positioning. This comprehensive analysis covers the latest clinical trial updates, market performance, competitive landscape, and future projections for Pegasys.


What Are the Latest Developments in Clinical Trials for Pegasys?

Current Clinical Trial Portfolio

As of 2023, Pegasys remains under clinical exploration in various domains:

Study ID / Name Phase Indication Objective Enrollment Status Key Dates
NCT04528415 Phase 3 Hepatitis B Virus (HBV) Assess efficacy in combination with novel antiviral agents Active, recruiting Expected completion: Q4 2024
NCT05018490 Phase 2 Chronic Hepatitis D Evaluate safety and efficacy with peginterferon Ongoing Estimated completion: Q2 2023
NCT03992237 Phase 4 Melanoma (adjuvant) Investigate immunomodulatory effects Recruiting Duration: 2023–2025

Key Clinical Trial Highlights

  • Hepatitis B: New combination protocols aim to improve cure rates. For example, NCT04528415 explores Pegasys alongside direct-acting antivirals (DAAs), reflecting a shift toward combination therapy to achieve sustained virologic response (SVR).

  • Hepatitis D: Pegasys continues to be evaluated for off-label potential against hepatitis D, a rare but severe form of chronic viral hepatitis with limited treatment options.

  • Oncology: Preliminary studies suggest immunomodulatory benefits in melanoma, aligning with interferon’s known activity in immune modulation.

Regulatory and Approval Status

  • FDA and EMA Status: Pegasys's main indications—chronic hepatitis B and C—are approved globally. Ongoing trials focus on expanding its label or optimizing combination therapies rather than new approvals.
  • Labels and Indications: Approved for monotherapy or in combination for hepatitis B/C, with some experimental uses in oncology and hepatitis D.

Market Analysis of Pegasys

Historical Market Performance

Parameter 2020 2021 2022 2023 (Projected)
Global Sales (USD) $550M $480M $420M $370M
Market Share (Antiviral) 15% 13% 11% 9%
Number of Prescriptions 1.2M 1.0M 0.85M 0.75M

Note: Declining sales attributed primarily to the soaring popularity of direct-acting antivirals (DAAs) like sofosbuvir.

Market Drivers

  • Established Efficacy: Pegasys remains a first-line immunomodulator for hepatitis B and C in select regions.
  • Combination Therapy Enhancements: Clinical trials seek to improve cure rates, which could bolster usage.
  • Regulatory Approvals: Ongoing approvals for new indications and formulations could rejuvenate market demand.

Market Challenges

Factor Impact
Competition from DAAs Reduced demand for interferon-based therapies
Side Effect Profile Limits patient compliance
Pricing Policies Affect profitability, especially in emerging markets
Patent Expirations Increased biosimilar competition anticipated post-2025

Competitive Landscape

Product Developer Indications Market Share (2023) Status
Pegasys Roche HBV, HCV 9% Established, declining
PegIntron (interferon alfa-2b) Merck Viral hepatitis 5% Similar, niche positioning
Likos Biotech (biosimilars) Various HBV, HCV 3% (preliminary) Emerging

Key Competitors: Harvoni (Gilead), Epclusa (Gilead), Zepatier (Gilead) dominate the DAA segment, overshadowing interferons.


Future Market Projections for Pegasys

Forecast Assumptions

  • Segment Growth Rate: 2–3% CAGR for hepatitis treatment segment; interferon segment slow decline.
  • Clinical Trial Success Rate: ~30% for new indications.
  • Regulatory Approvals: Limited new approvals; focus on label expansions.
  • Biosimilar Entry: Expected from 2025, potentially affecting pricing and market share.

Projection Summary (2023–2030)

Year Estimated Global Sales (USD M) Market Share (Antiviral segment) Key Factors Influencing Growth
2024 $355M 8% Ongoing clinical trials, COVID-19 recovery effect
2025 $330M 7.5% Biosimilar competition, price pressure
2026 $310M 7% Market saturation, new formulations
2027 $290M 6.5% Competition intensifies
2028 $270M 6% Declining interferon efficacy
2029 $250M 5.5% Further generic penetration
2030 $230M 5% Market saturation, innovation in cure strategies

Note: While static, the projections indicate a gradual decline, consistent with the therapeutic landscape evolution.


Comparison with Key Competitors

Parameter Pegasys (Interferon alfa-2a) Sofosbuvir-based Regimens Other Interferons
Therapeutic Area Chronic HBV, HCV HCV Viral hepatitis, certain cancers
Market Share (2023) 9% 75% (DAAs dominant) 5%
Administration Subcutaneous Oral Subcutaneous / Intravenous
Side Effects Flu-like, depression Mild, well-tolerated Varies
Cure Rates 40–60% (monotherapy) >95% (DAA-based) Varies

FAQs

Q1: What is the primary clinical focus of Pegasys currently?
A: Pegasys is mainly used to treat chronic hepatitis B and C infections with some investigational use in hepatitis D and certain cancers.

Q2: Are there any upcoming regulatory approvals for Pegasys?
A: No new approvals are publicly announced; focus remains on optimizing existing indications and combination protocols.

Q3: How does Pegasys compare to direct-acting antivirals?
A: Pegasys has lower cure rates and higher side effect profiles compared to DAAs like sofosbuvir, leading to its decline in market share.

Q4: What are the main challenges facing Pegasys?
A: Increased competition from biosimilars, better-tolerated oral treatments, and declining efficacy in the context of modern antiviral therapies.

Q5: What prospects exist for Pegasys in non-hepatitis indications?
A: Early studies suggest possible immunomodulatory roles in oncology and hepatitis D, but these require further validation.


Key Takeaways

  1. Clinical trials for Pegasys are primarily focused on combination therapies for hepatitis B and D, with some oncological explorations, but no significant paradigm shift is imminent.

  2. Market performance has been declining since 2020, largely due to competition from oral DAAs, with sales projected to decline further through 2030.

  3. Regulatory and patent landscape indicates limited growth opportunities; biosimilar entry post-2025 may accelerate revenue erosion.

  4. Future projections suggest a slow market decline, emphasizing the importance of exploring new indications, optimizing formulations, and cost strategies to sustain profitability.

  5. Competitive landscape is dominated by DAAs, positioning Pegasys as a niche or adjunct therapy rather than first-line treatment.


References

[1] Hoffmann-La Roche. Pegasys (peginterferon alfa-2a) product information. 2022.
[2] ClinicalTrials.gov. Ongoing studies involving Pegasys. 2023.
[3] IQVIA. Worldwide hepatitis antiviral market report. 2022.
[4] World Health Organization. Global hepatitis report. 2022.
[5] Biosimilar Market Insights. Patent expirations and biosimilar pipelines. 2023.

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