chemistry

Omacetaxine mepesuccinate

Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate rather than just read about it. In short: Omacetaxine mepesuccinate (INN; trade name Synribo; formerly named as homoharringtonine or HHT) is a pharmaceutical drug substance that is indicated for treatment of chronic myeloid leukemia (CML). Omacetaxine approval in US is discontinued (August 2024)[1][2] and is no longer recommended for treatment of CML (as of NCCN CML guidance 3.2025) [3].

Key takeaways

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

Reference excerpt

Omacetaxine mepesuccinate (INN; trade name Synribo; formerly named as homoharringtonine or HHT) is a pharmaceutical drug substance that is indicated for treatment of chronic myeloid leukemia (CML). Omacetaxine approval in US is discontinued (August 2024)[1][2] and is no longer recommended for treatment of CML (as of NCCN CML guidance 3.2025) [3]. HHT is a natural plant alkaloid derived from Cephalotaxus fortunei. HHT and related compound esters of cephalotaxine were described first in 1970, and were the subject of intensive research efforts by Chinese investigators to clarify their role as anticancer and antileukemic agents from the 1970s until the present. It was approved by the US FDA in October 2012 for the treatment of adult patients with CML with resistance and/or intolerance to two or more tyrosine kinase inhibitors (TKIs).

Medical uses Omacetaxine/homoharringtonine was indicated for use as a treatment for patients with chronic myeloid leukaemia who are resistant or intolerant of tyrosine kinase inhibitors. In June 2009, results of a long-term open label Phase II study were published, which investigated the use of omacetaxine infusions in CML patients. After twelve months of treatment, about one third of patients showed a cytogenetic response. A study in patients who had failed imatinib and who had the drug resistant T315I mutation achieved cytogenetic response in 28% of patients and hematologic response in 80% of patients, according to preliminary data. Phase I studies including a small number of patients have shown benefit in treating myelodysplastic syndrome (MDS, 25 patients) and acute myelogenous leukaemia (AML, 76 patients). Patients with solid tumors did not benefit from omacetaxine.

Adverse effects By frequency: Very common (>10% frequency):

Common (1–10% frequency):

Seizures Haemorrhage † Myelosuppression, including: thrombocytopenia, anaemia, neutropenia and lymphopenia, in descending order of frequency. Omacetaxine mepesuccinate can cause fetal harm when administered to a pregnant woman. Women using HHT should avoid becoming pregnant and also avoid nursing while receiving HHT.

Mechanism of action Omacetaxine mepesuccinate is a protein translation inhibitor. It inhibits protein translation by preventing the initial elongation step of protein synthesis. It interacts with the ribosomal A-site and prevents the correct positioning of amino acid side chains of incoming aminoacyl-tRNAs. Omacetaxine mepesuccinate acts only on the initial step of protein translation and does not inhibit protein synthesis from mRNAs that have already commenced translation.

References

Illustrations

Worked examples

Example 1 — a first encounter with Omacetaxine mepesuccinate

Start with the simplest possible case. Write down what Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate

In research: Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate 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: Omacetaxine mepesuccinate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkaloids, Benzazepanes, Cyclopentenes, so understanding it makes those chapters shorter.
In everyday life: Look for Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate in 20 minutes

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

Frequently asked questions

What is Omacetaxine mepesuccinate in simple terms?

Why does Omacetaxine mepesuccinate 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 Omacetaxine mepesuccinate?

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 Omacetaxine mepesuccinate.