chemistry

Tesmilifene

Tesmilifene 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 Tesmilifene rather than just read about it. In short: Tesmilifene (INN; developmental code names YMB-1002, BMS-217380-01), also known as N,N-diethyl-2-(4-phenylmethyl)ethanamine (DPPE), is a small-molecule antineoplastic drug and chemopotentiator that was under development by YM BioSciences for the treatment of breast cancer in the 2000s but was never marketed. It reached phase III clinical trials for advanced/metastatic breast cancer before development was discontinue…

Key takeaways

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

Reference excerpt

Tesmilifene (INN; developmental code names YMB-1002, BMS-217380-01), also known as N,N-diethyl-2-(4-phenylmethyl)ethanamine (DPPE), is a small-molecule antineoplastic drug and chemopotentiator that was under development by YM BioSciences for the treatment of breast cancer in the 2000s but was never marketed. It reached phase III clinical trials for advanced/metastatic breast cancer before development was discontinued. Tesmilifene is a diphenylmethane derivative that is structurally related to the triphenylethylene derivative tamoxifen but lacks the stilbene bridge and third phenyl ring necessary for binding to the estrogen receptor (ER), and as such, it is not a selective estrogen receptor modulator (SERM). In addition to tamoxifen, tesmilifene is structurally related to diphenylmethane antihistamines like diphenhydramine and hydroxyzine, but is much weaker than these agents in assays of anti-H1 receptor activity, and hence, neither acts as an antihistamine. Tamoxifen is known to bind not only to the ER but also to non-ER so-called "antiestrogen binding sites" (AEBS) that are present in cell microsomes as opposed to the cell nucleus. Tesmilifene was developed as a selective ligand of the AEBS without ER affinity to investigate these sites and their role in the antineoplastic activity of tamoxifen. Histamine has been found to be a ligand of the AEBS, and it has been determined that the AEBS represent the substrate binding site of certain microsomal cytochrome P450 enzymes including CYP3A4, CYP2D6, and CYP1A1. Tesmilifene binds to and displaces histamine from these sites equipotently to tamoxifen and more strongly than conventional antihistamines, and this action has been found to correlate with the cytotoxic effects of tesmilifene in breast cancer cells in vitro. Moreover, in spite of its lack of affinity for the ER, tesmilifene antagonizes the uterotrophic effects of exogenous estrogen in vivo.

Worked examples

Example 1 — a first encounter with Tesmilifene

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

In research: Tesmilifene 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 Tesmilifene 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: Tesmilifene is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abandoned drugs, Antineoplastic drugs, Diethylamino compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Tesmilifene 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 Tesmilifene in 20 minutes

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

Frequently asked questions

What is Tesmilifene in simple terms?

Why does Tesmilifene 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 Tesmilifene?

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 Tesmilifene.