biology

Peginterferon alfa-2b

Peginterferon alfa-2b 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-2b rather than just read about it. In short: Pegylated interferon alfa-2b is a drug used to treat melanoma, as an adjuvant therapy to surgery. Also used to treat hepatitis C (typically, in combination with ribavirin), it is no longer recommended due to poor efficacy and adverse side-effects.

Key takeaways

Peginterferon alfa-2b 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-2b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Peginterferon alfa-2b from memory before moving on to harder problems.

Reference excerpt

Pegylated interferon alfa-2b is a drug used to treat melanoma, as an adjuvant therapy to surgery. Also used to treat hepatitis C (typically, in combination with ribavirin), it is no longer recommended due to poor efficacy and adverse side-effects. Subcutaneous injection is the preferred delivery method. Belonging to the alpha interferon family of medications, the molecule is PEGylated to prevent breakdown. Approval for medical use in the United States was granted in 2001. It is on the World Health Organization's List of Essential Medicines as a therapy for chronic hepatitis C.

Medical uses

Hepatitis Till around 2010, PEGylated interferon alfa-2b in combination with ribavirin, was part of the standard regimen used in management of hepatitis C. Ribivarin helped in increasing the Sustained Virologic Response (SVR) even more. Developed by Schering-Plough, the drug was approved by Food and Drug Administration (FDA) of the United States in 2001, and has been on the World Health Organization's List of Essential Medicines as a therapy for chronic hepatitis C since 2013. A 2013 meta-analysis over Clinical Infectious Diseases noted the combination-treatment to be safe as well as effective for children and adolescents; other meta-analyses had noted the same for adult population. A 2012 meta-analysis had found PEGylated interferon alfa-2a to be the more effective variant for treatment-naive patients. With the advent of Direct-Acting-Antivirals (DAAs — ), interferon-based treatment regimens gradually fell out of fashion due to relatively poor efficacy and high frequency of adverse side-effects. No longer recommended, the use of PEGylated interferon alfa-2b has essentially ceased in all countries, where DAA therapeutics are available.

Melanoma For high-risk melanoma, it is used as an adjuvant therapy to surgery in some countries. It was first approved for the purpose by FDA on 29 March 2011, based on a single phase III trial. The usage remains controversial — frequency of severe side-effects is high, overall survival benefits substantially vary across different trials, and there is no consensus on the dosage regimen. Meta-analyses have suggested that the drug might be more helpful for patients with ulcerated primary lesion.

COVID-19 On 23 April 2021, the Drugs Controller General of India approved emergency use of the medication (upon a request by Cadila Healthcare; trade name is Virafin) for treating moderate COVID-19 infections. No publication (or preprint) yet exists; the phase II trial was poorly designed and not robust.

Side effects Adverse side effects are common and often require dose reduction or outright discontinuation. Common side effects include fatigue, headache, insomnia, depression, mood swings, hair loss, nausea, diarrhea, myalgia and associated skeletal pain, anorexia, fever etc. Relatively rare effects include imbalance of thyroid hormones, xerostomia, thrombocytopenia, hepatomegaly, pharyngitis, cough, psychosis, rashes, arrhythmia, anemia etc. Severe side effects may include a range of potentially fatal neuropsychiatric, autoimmune, ischemic, or infectious disorders.

Mechanism of action

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 that 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. A later report from Nature demonstrated that the same genetic variants are also associated with the natural clearance of the genotype 1 hepatitis C virus.

References

External links Medicines patent loophole 'found' at the BBC, 2007 PEG-Intron (Peginterferon Alfa-2B) — Platelet Count Decreased from DrugLib.com

Worked examples

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

Start with the simplest possible case. Write down what Peginterferon alfa-2b 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-2b 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-2b 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-2b

In research: Peginterferon alfa-2b 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-2b 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-2b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Drugs developed by Merck & Co., Drugs developed by Schering-Plough, Immunostimulants, so understanding it makes those chapters shorter.
In everyday life: Look for Peginterferon alfa-2b 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-2b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peginterferon alfa-2b 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-2b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peginterferon alfa-2b in simple terms?

Why does Peginterferon alfa-2b 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-2b?

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-2b.