science

Rubitecan

Rubitecan 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 Rubitecan rather than just read about it. In short: Rubitecan (INN, trade name Orathecin) is an oral topoisomerase inhibitor, developed by SuperGen (now Astex Pharmaceuticals, a member of the Otsuka Group). History On January 27, 2004, SuperGen announced that it has completed the submission of an NDA for rubitecan to the US FDA, and was accepted for filing in March 2004.

Key takeaways

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

Reference excerpt

Rubitecan (INN, trade name Orathecin) is an oral topoisomerase inhibitor, developed by SuperGen (now Astex Pharmaceuticals, a member of the Otsuka Group).

History On January 27, 2004, SuperGen announced that it has completed the submission of an NDA for rubitecan to the US FDA, and was accepted for filing in March 2004. In January 2005, and under the direction of then-CEO James Manuso, SuperGen withdrew the NDA for rubitecan, based on feedback indicating that the current data package would not be sufficient to gain US approval, and in January 2006, the Marketing Authorization Application (MAA) filed with the European Medicines Agency (EMA) was also withdrawn. The name rubitecan is a portmanteau of SuperGen's founder, Joseph Rubinfeld, and the chemical name 9-nitrocamptothecin.

Synthesis Large scale production of rubitecan has encountered problems. The direct nitration of camptothecin results in regioselectivity problems. One way that has been used to synthesize Rubitecan is to nitrate 10-hydroxycamptothecin then remove the hydroxyl functional group.

Use as anticancer drug Rubitecan is a compound used extensively in cancer research. Rubitecan is an effective drug against pancreatic cancer and other solid tumors. One major problem is the lack of oral bioavailability due to low permeability and poor water solubility. One study shows 9-NC-SD through Soluplus1-based solid dispersion system is a much more effective delivery method than free 9-NC.

References

Illustrations

Worked examples

Example 1 — a first encounter with Rubitecan

Start with the simplest possible case. Write down what Rubitecan 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 Rubitecan 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 Rubitecan 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 Rubitecan

In research: Rubitecan 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 Rubitecan 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: Rubitecan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abandoned drugs, Drugs not assigned an ATC code, Topoisomerase inhibitors, so understanding it makes those chapters shorter.
In everyday life: Look for Rubitecan 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 Rubitecan in 20 minutes

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

Frequently asked questions

What is Rubitecan in simple terms?

Rubitecan (INN, trade name Orathecin) is an oral topoisomerase inhibitor, developed by SuperGen (now Astex Pharmaceuticals, a member of the Otsuka Group). History On January 27, 2004, SuperGen announced that it has completed the submission of an NDA for rubitecan to the US FDA, and was accepted for…

Why does Rubitecan 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 Rubitecan?

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 Rubitecan.