biology

Peginterferon alfa-2a

Peginterferon alfa-2a is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Peginterferon alfa-2a rather than just read about it. In short: Pegylated interferon alfa-2a, sold under the brand name Pegasys among others, is medication used to treat hepatitis C and hepatitis B. For hepatitis C it is typically used together with ribavirin and cure rates are between 24 and 92%.

Key takeaways

Peginterferon alfa-2a belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Peginterferon alfa-2a to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Peginterferon alfa-2a from memory before moving on to harder problems.

Reference excerpt

Pegylated interferon alfa-2a, sold under the brand name Pegasys among others, is medication used to treat hepatitis C and hepatitis B. For hepatitis C it is typically used together with ribavirin and cure rates are between 24 and 92%. For hepatitis B it may be used alone. It is given by injection under the skin. Side effects are common. They may include headache, feeling tired, depression, trouble sleeping, hair loss, nausea, pain at the site of injection, and fever. Severe side effects may include psychosis, autoimmune disorders, blood clots, or infections. Use with ribavirin is not recommended during pregnancy. Pegylated interferon alfa-2a is in the alpha interferon family of medications. It is pegylated to protect the molecule from breakdown. Pegylated interferon alfa-2a was approved for medical use in the United States in 2002. It is on the World Health Organization's List of Essential Medicines.

Medical uses This drug is approved around the world for the treatment of chronic hepatitis C (including people with HIV co-infection, cirrhosis, 'normal' levels of ALT) and has recently been approved (in the EU, U.S., China and many other countries) for the treatment of chronic hepatitis B. It is also used in the treatment of certain T-cell lymphomas, particularly mycosis fungoides. Additionally, NCCN guidelines recommend peginterferon alfa-2a as a potential option for treatment of several myeloproliferative neoplasms, including essential thrombocythemia, primary myelofibrosis, and polycythemia vera, particularly in young patients or instances where hydroxyurea is contraindicated, such as pregnancy. Peginterferon alfa-2a is a long acting interferon. Interferons are proteins released in the body in response to viral infections. Interferons are important for fighting viruses in the body, for regulating reproduction of cells, and for regulating the immune system.

Host genetic factors For genotype 1 hepatitis C treated with pegylated interferon alfa-2a or pegylated interferon alfa-2b combined with ribavirin, it has been shown that genetic polymorphisms near the human IL28B gene, encoding interferon lambda 3, are associated with significant differences in response to the treatment. This finding, originally reported in Nature, showed genotype 1 hepatitis C patients carrying certain genetic variant alleles near the IL28B gene are more likely to achieve sustained virological response after the treatment than others. Another report in Nature demonstrated the same genetic variants are also associated with the natural clearance of the genotype 1 hepatitis C virus.

Manufacturing It is pegylated with a branched 40 kg/mol PEG chain.

Availability Peginterferon alfa-2a is manufactured under the brand name Pegasys. In 2021, Roche Pharmaceuticals sold the worldwide rights of Pegasys (excluding China and Japan) to zr pharma& GmbH (pharma&). In May 2022, Roche Australia transferred the sales and marketing of Pegasys to Echo Therapeutics Pty Ltd.

Research A Cochrane Review sought to determine whether interferon alfa-2a could be used as a treatment for individuals with neovascular age-related macular degeneration. They found no evidence of improved visual acuity with potential harm.

References

External links

Pegasys at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Worked examples

Example 1 — a first encounter with Peginterferon alfa-2a

Start with the simplest possible case. Write down what Peginterferon alfa-2a claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Peginterferon alfa-2a before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Peginterferon alfa-2a ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Peginterferon alfa-2a

In research: Peginterferon alfa-2a appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Peginterferon alfa-2a in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Peginterferon alfa-2a is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antiviral drugs, CYP1A2 inhibitors, Drugs developed by Genentech, so understanding it makes those chapters shorter.
In everyday life: Look for Peginterferon alfa-2a outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Peginterferon alfa-2a in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peginterferon alfa-2a means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Peginterferon alfa-2a out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peginterferon alfa-2a in simple terms?

Why does Peginterferon alfa-2a matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Peginterferon alfa-2a?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Peginterferon alfa-2a.