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Pegasys

Phase 3

Chronic Hepatitis B | Small molecule | Infectious Disease |Roche Holding AG|Last Updated: Apr 24, 2025

Target and mechanism

ModalitySmall molecule

Also known as PEGASYS [peginterferon alfa-2a]

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment820

FDA Designations

No designations recorded

Clinical trial landscape

Pegasys · 3 trials · 4 indications

Phase 3 1Phase 2 2
NCT00048945Efficacy and Safety Study of Pegasys in the Treatment of Chronic Hepatitis BChronic Hepatitis B
COMPLETED820 Analytics
PHASE3COMPLETED
Efficacy and Safety Study of Pegasys in the Treatment of Chronic Hepatitis B
Chronic Hepatitis BUnlock trial analytics

Study Endpoints

Primary Endpoints

Evaluate the ability of Pegylated Interferon Alfa-2a to achieve Complete Response or Partial Response in patients with (1) high risk polycythemia vera or (2) high risk essential thrombocythemia or (3) splanchnic vein thrombosis
4 years
Percentage of Participants With Stable Virological Response
Up to Week 108

Stable virological response is serum Hepatitis B virus deoxyribonucleic acid (HBV DNA) \<20 000 copies/ml during the treatment (after each 12 weeks) and after the follow-up period (24 weeks after the last treatment period).

Secondary Endpoints

To evaluate the toxicity and tolerability of therapy Pegylated Interferon Alfa-2a in each of the 3 strata by recording the number of adverse events that occur during the study by using CTC 4.0 as the guide.
4 years
To measure the impact of Pegylated Interferon Alfa-2a on key biomarkers of the disease(s)by measuring the JAK2 allele burden.
4 years
To evaluate specific pre-defined toxicity and tolerance of Pegylated Interferon Alfa-2a through a sequential structured symptom assessment package of patient reported outcome instruments.
4 years
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Study Design & Arms

PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PEGASYSEXPERIMENTALPatient will start at 45 micrograms per week and gradually increase to 180 micrograms per week. Pegasys will be supplied in prefilled syringes and are to be given subcutaneously.
AspirinACTIVE_COMPARATOR81 or 100 mg daily.
No InterventionNO_INTERVENTIONParticipants were on non- specific anti-viral treatment.

Interventions

NameTypeDescription
PEGASYSDRUG -
AspirinDRUG81 or 100 mg daily.
PEGASYS [peginterferon alfa-2a]DRUGThere were 4 treatment cycles of continuous intermittent treatment with Peginterferon alfa-2a. Each cycle consisted of 12 weeks injection treatment with Peginterferon alfa-2a 135 micrograms in 0.5 ml solution in prefilled syringes, applied once weekly subcutaneously and followed by 12 weeks period without treatment.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites74

Inclusion Criteria: * Clinical diagnosis of hepatitis B * Not pregnant Exclusion Criteria: * Treatment for hepatitis B in past 6 months * Other hepatitis infections * Severe liver disease * Pregnancy

Countries:United StatesAustraliaBrazilCanadaChinaFranceGermanyIsraelNew ZealandPolandPuerto RicoSingaporeSouth KoreaSwitzerlandTaiwanThailandUnited KingdomItalyBulgaria
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Frequently asked questions about Pegasys

What is PEGASYS used for?

PEGASYS is used for the treatment of chronic hepatitis B, including HBeAg negative chronic hepatitis B, and for high risk polycythemia vera. It is an investigational drug in clinical development for these conditions. The drug is being studied in patients aged 18 years and older.

Who makes PEGASYS?

PEGASYS is developed by Roche Holding AG, a company publicly traded under the ticker RHHBY. Roche is conducting clinical trials to evaluate the drug's efficacy and safety in chronic hepatitis B and high risk polycythemia vera.

What phase is PEGASYS in?

PEGASYS is in Phase 3 clinical development for chronic hepatitis B. It has completed a Phase 3 trial with 820 participants. Additionally, Phase 2 trials have been completed for HBeAg negative chronic hepatitis B and high risk polycythemia vera.

What clinical trials is PEGASYS in?

PEGASYS has completed clinical trials including NCT00048945, a Phase 3 study in chronic hepatitis B with 820 participants, and NCT00442572, a Phase 2 study in HBeAg negative chronic hepatitis B. Another completed trial is NCT01259817 for high risk polycythemia vera.

Is PEGASYS the same as peginterferon alfa-2a?

PEGASYS is also known as peginterferon alfa-2a (40KD). In clinical trials, it is referred to by this name, as seen in the study of intermittent long term treatment with PEGASYS in patients with HBeAg negative chronic hepatitis B.