chemistry

Imlunestrant

Imlunestrant 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 Imlunestrant rather than just read about it. In short: Imlunestrant, sold under the brand name Inluriyo, is an anti-cancer medication used for the treatment of breast cancer. It is an estrogen receptor antagonist.

Key takeaways

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

Reference excerpt

Imlunestrant, sold under the brand name Inluriyo, is an anti-cancer medication used for the treatment of breast cancer. It is an estrogen receptor antagonist. It is used as the salt, imlunestrant tosylate. It is taken by mouth. It was developed by Eli Lilly and Company. The most common adverse events and laboratory abnormalities include decreased hemoglobin, musculoskeletal pain, decreased calcium, decreased neutrophils, increased AST, fatigue, diarrhea, increased ALT, increased triglycerides, nausea, decreased platelets, constipation, increased cholesterol, and abdominal pain. Imlunestrant was approved for medical use in the United States in September 2025, and in the European Union in January 2026.

Medical uses Imlunestrant is indicated for the treatment of adults with ER-positive, HER2-negative, ESR1-mutated advanced or metastatic breast cancer with disease progression following at least one line of endocrine therapy.

History Efficacy was evaluated in EMBER-3 (NCT04975308), a randomized, open-label, active-controlled, multi-center trial that enrolled 874 participants with ER-positive, HER2-negative locally advanced or metastatic breast cancer previously treated with an aromatase inhibitor either alone or in combination with a CDK4/6 inhibitor. Participants were excluded if they were eligible to receive a PARP inhibitor. Participants were randomized 1:1:1 to imlunestrant, an investigator's choice of endocrine therapy (fulvestrant or exemestane), or an additional investigational combination regimen. Randomization was stratified by previous treatment with a CDK4/6 inhibitor, presence of visceral metastasis, and geographic region. ESR1 mutational status was determined by blood circulating tumor deoxyribonucleic acid (ctDNA) analysis using the Guardant360 CDx assay and was limited to specific ESR1 mutations in the ligand-binding domain. The US Food and Drug Administration granted the application of imlunestrant fast track designation.

Society and culture

Legal status Imlunestrant was approved for medical use in the United States in September 2025. In November 2025, the Committee for Medicinal Products for Human Use of the European Medicines Agency adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Inluriyo, intended for the treatment of adults with locally advanced or metastatic breast cancer with an activating ESR1-mutation. The applicant for this medicinal product is Eli Lilly Nederland B.V. Imlunestrant was authorized for medical use in the European Union in January 2026.

Names Imlunestrant is the international nonproprietary name. Imlunestrant is sold under the brand name Inluriyo.

References

Further reading Jhaveri, Komal L.; Jeselsohn, Rinath; Lim, Elgene; Hamilton, Erika P.; Yonemori, Kan; Beck, J. Thaddeus; et al. (June 2022). "A phase 1a/b trial of imlunestrant (LY3484356), an oral selective estrogen receptor degrader (SERD) in ER-positive (ER+) advanced breast cancer (aBC) and endometrial endometrioid cancer (EEC): Monotherapy results from EMBER". Journal of Clinical Oncology. 40 (16_suppl): 1021. doi:10.1200/JCO.2022.40.16_suppl.1021. S2CID 249445691. Jhaveri, Komal; O'Shaughnessy, Joyce; Andre, Fabrice; Goetz, Matthew P.; Harbeck, Nadia; Martín, Miguel; et al. (March 2023). "Abstract OT1-01-02: EMBER-4: A phase 3 adjuvant trial of imlunestrant vs standard endocrine therapy (ET) in patients with ER+, HER2- early breast cancer (EBC) with an increased risk of recurrence who have previously received 2 to 5 years of adjuvant ET". Cancer Research. 83 (5_Supplement): OT1–01–02-OT1-01–02. doi:10.1158/1538-7445.SABCS22-OT1-01-02. Neven, P.; Stahl, N.; Losada, M.J. Vidal; Jimenez, M. Martin; Kaufman, P.A.; Harbeck, N.; et al. (October 2023). "273P A preoperative window-of-opportunity (WOO) study of imlunestrant in ER+, HER2- early breast cancer (EBC): Final analysis from EMBER-2". Annals of Oncology. 34: S292–S293. doi:10.1016/j.annonc.2023.09.470. S2CID 264385454.

External links Clinical trial number NCT04975308 for "A Study of Imlunestrant, Investigator's Choice of Endocrine Therapy, and Imlunestrant Plus Abemaciclib in Participants With ER+, HER2- Advanced Breast Cancer (EMBER-3)" at ClinicalTrials.gov

Illustrations

Worked examples

Example 1 — a first encounter with Imlunestrant

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

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

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

Frequently asked questions

What is Imlunestrant in simple terms?

Imlunestrant, sold under the brand name Inluriyo, is an anti-cancer medication used for the treatment of breast cancer. It is an estrogen receptor antagonist.

Why does Imlunestrant 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 Imlunestrant?

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 Imlunestrant.