chemistry

Procarbazine

Procarbazine is a chemistry 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 Procarbazine rather than just read about it. In short: Procarbazine is a chemotherapy medication used for the treatment of Hodgkin lymphoma and brain cancers. For Hodgkin lymphoma it is often used together with chlormethine, vincristine, and prednisone while for brain cancers such as glioblastoma multiforme it is used with lomustine and vincristine.

Key takeaways

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

Reference excerpt

Procarbazine is a chemotherapy medication used for the treatment of Hodgkin lymphoma and brain cancers. For Hodgkin lymphoma it is often used together with chlormethine, vincristine, and prednisone while for brain cancers such as glioblastoma multiforme it is used with lomustine and vincristine. It is typically taken by mouth. Common side effect include low blood cell counts and vomiting. Other side effects include tiredness and depression. It is not recommended in people with severe liver or kidney problems. Use in pregnancy is known to harm the baby. Procarbazine is in the alkylating agents family of medication. How it works is not clearly known. Procarbazine was approved for medical use in the United States in 1969. It is on the World Health Organization's List of Essential Medicines. In the United Kingdom a month of treatment cost the National Health Service 450 to 750 pounds.

Medical uses When used to treat Hodgkin lymphoma, it is often delivered as part of the BEACOPP regimen that includes bleomycin, etoposide, adriamycin, cyclophosphamide, vincristine (tradename Oncovin), prednisone, and procarbazine. The first combination chemotherapy developed for Hodgkin lymphoma (HL), MOPP also included procarbazine (ABVD has supplanted MOPP as standard first line treatment for HL, with BEACOPP as an alternative for advanced/unfavorable HL). Alternatively, when used to treat certain brain tumors (malignant gliomas), it is often dosed as PCV when combined with lomustine (often called CCNU) and vincristine. Dose is adjusted for kidney disease or liver disease.

Side effects Very common (greater than 10% of people experience them) adverse effects include loss of appetite, nausea and vomiting. Other side effects of unknown frequency include reduction in leukocytes, reduction in platelets, reduction in neutrophils, which can lead to increased infections including lung infections; severe allergy-like reactions that can lead to angioedema and skin reactions; lethargy; liver complications including jaundice and abnormal liver function tests; reproductive effects including reduction in sperm count and ovarian failure. When combined with ethanol, procarbazine may cause a disulfiram-like reaction in some people. It weakly inhibits MAO in the gastrointestinal system, so it can cause hypertensive crises if associated with the ingestion of tyramine-rich foods such as aged cheeses; this appears to be rare. Procarbazine rarely causes chemotherapy-induced peripheral neuropathy, a progressive, enduring, often irreversible tingling numbness, intense pain, and hypersensitivity to cold, beginning in the hands and feet and sometimes involving the arms and legs.

Pharmacology Procarbazine works, in part, as an alkylating agent and methylates guanine at the O-6 position (much like dacarbazine also does). Guanine is one of the four nucleotides that makes up DNA. The methylated DNA is prone to breakage, and RNA and protein synthesis is inhibited. Proliferating cancer cells need to replicate their DNA and undergo programmed cell death (apoptosis) in response to DNA strand breaks. Normal or non-proliferating cells are more apt to repair the DNA damage, but still some of the healthy cells will be damaged. Procarbazine is metabolized in the liver to an azo-derivative and then further metabolized by the cytochrome P-450 system to an active azoxy-derivative.

References

External links MOPP Treatment Regimen PCV Information Procarbazine Drug Information Provided by Lexi-Comp – Merck Manual RX Listing for Matulane "Procarbazine". Drug Information Portal. U.S. National Library of Medicine. Archived from the original on July 5, 2016.

Illustrations

Worked examples

Example 1 — a first encounter with Procarbazine

Start with the simplest possible case. Write down what Procarbazine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Procarbazine 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 Procarbazine 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 Procarbazine

In research: Procarbazine appears in chemistry 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 Procarbazine 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: Procarbazine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Benzamides, Cancer treatments, DNA replication inhibitors, so understanding it makes those chapters shorter.
In everyday life: Look for Procarbazine 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 Procarbazine in 20 minutes

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

Frequently asked questions

What is Procarbazine in simple terms?

Why does Procarbazine matter?

Because it connects several chemistry 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 Procarbazine?

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 Procarbazine.