chemistry

Rebimastat

Rebimastat 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 Rebimastat rather than just read about it. In short: Rebimastat is an abandoned investigational antineoplastic drug developed as a broad-spectrum matrix metalloproteinase inhibitor (MMPI). It was designed to target enzymes implicated in cancer progression, aiming to reduce tumor growth and metastasis.

Key takeaways

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

Reference excerpt

Rebimastat is an abandoned investigational antineoplastic drug developed as a broad-spectrum matrix metalloproteinase inhibitor (MMPI). It was designed to target enzymes implicated in cancer progression, aiming to reduce tumor growth and metastasis. Although promising in preclinical studies, clinical development was halted due to adverse effects.

Pharmacology Rebimastat is a second-generation, sulfhydryl-based MMPI that binds to the catalytic zinc ion within the active site of several matrix metalloproteinases (MMPs), including MMP-1, MMP-2, MMP-7, MMP-9, and MMP-14. MMPs are zinc-dependent endopeptidases that play a crucial role in the degradation of the extracellular matrix (ECM). This ECM remodeling is essential for various physiological processes, but in cancer, it facilitates angiogenesis (formation of new blood vessels), tumor invasion, and metastasis (spread of cancer cells to distant sites). By inhibiting these MMPs, rebimastat aimed to disrupt these processes, potentially limiting tumor growth and spread by reducing blood supply and hindering tumor cell proliferation. As one of the earlier non-hydroxamate MMPIs, rebimastat incorporates a thiol zinc-binding group. This design aimed to achieve broad-spectrum MMP inhibition while minimizing inhibition of sheddases (also known as ADAMs), metalloproteinases responsible for shedding membrane-bound proteins. This "sheddase-sparing" approach was intended to mitigate some of the side effects observed with earlier MMP inhibitors, which were thought to be related to the inhibition of these other metalloproteinases.

History Rebimastat was initially developed by Chiroscience (later part of Celltech Group plc) and subsequently by Bristol-Myers Squibb. Preclinical studies demonstrated rebimastat's potential, showing dose-dependent inhibition of angiogenesis and tumor metastasis in models such as the B16-BL6 metastatic melanoma cell line and the in vivo Matrigel plug cell migration assay. It also inhibited tumor progression in other rodent tumor models.

Clinical trials Clinical trials evaluated rebimastat's efficacy and safety in various cancers, including prostate cancer, HIV-related Kaposi's sarcoma, non-small cell lung cancer (NSCLC), and breast cancer. These included multiple phase II trials and at least one phase III trial. However, clinical development was ultimately discontinued due to significant toxicity. Phase II trials in early-stage breast cancer and a phase III trial in NSCLC, where rebimastat was used as adjuvant therapy, were halted because patients experienced arthralgia (joint pain), a side effect consistent with MMP inhibitor-induced musculoskeletal toxicity. Other reported adverse effects included myalgia (muscle pain), skin rash, fatigue, nausea, headache, and taste alterations. The observed toxicity profile, coupled with a lack of significant clinical benefit, led to the termination of rebimastat's clinical development.

References

Illustrations

Worked examples

Example 1 — a first encounter with Rebimastat

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

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

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

Frequently asked questions

What is Rebimastat in simple terms?

Why does Rebimastat 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 Rebimastat?

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 Rebimastat.