science

Raltitrexed

Raltitrexed is a science 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 Raltitrexed rather than just read about it. In short: Raltitrexed (Thaltitrexed, Tomudex, TDX, ZD 1694) is an antimetabolite drug used in cancer chemotherapy. It is an inhibitor of thymidylate synthase, and is manufactured by AstraZeneca.

Key takeaways

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

Reference excerpt

Raltitrexed (Thaltitrexed, Tomudex, TDX, ZD 1694) is an antimetabolite drug used in cancer chemotherapy. It is an inhibitor of thymidylate synthase, and is manufactured by AstraZeneca.

Uses Used in treatment of colorectal cancer since 1998, it may also be used in the treatment of malignant mesothelioma. Raltitrexed is approved for use in Canada and some European countries, but is not approved by the US FDA.

Mechanism of action Raltitrexed is chemically similar to folic acid and is in the class of chemotherapy drugs called folate antimetabolites, which inhibit one or more of three enzymes that use folate and derivatives as substrates: DHFR, GARFT and thymidylate synthase. Raltitrexed is fully active after polyglutamylation, which allows cellular retention of the drug. By inhibiting Thymidylate synthase (TS), thus formation of precursor pyrimidine nucleotides, raltitrexed prevents the formation of DNA and RNA, which are required for the growth and survival of both normal cells and cancer cells. Inhibition of L1210 cell growth in culture IC50 = 9 nM, is one of the strongest antimetabolites in use. Structure and phase I clinical trial of the precursor drug, CB3717, was described in 1986.

References

Illustrations

Worked examples

Example 1 — a first encounter with Raltitrexed

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

In research: Raltitrexed appears in science 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 Raltitrexed 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: Raltitrexed is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antifolates, Drugs developed by AstraZeneca, Lactams, so understanding it makes those chapters shorter.
In everyday life: Look for Raltitrexed 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 Raltitrexed in 20 minutes

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

Frequently asked questions

What is Raltitrexed in simple terms?

Raltitrexed (Thaltitrexed, Tomudex, TDX, ZD 1694) is an antimetabolite drug used in cancer chemotherapy. It is an inhibitor of thymidylate synthase, and is manufactured by AstraZeneca.

Why does Raltitrexed matter?

Because it connects several science 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 Raltitrexed?

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 Raltitrexed.