chemistry

Theranostics

Theranostics 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 Theranostics rather than just read about it. In short: Theranostics, or theragnostics, refers to the combination of diagnosis and therapy (treatment) of disease in a single medical intervention or technique. For example, a combination of radioactive isotopes may be administered to simultaneously identify and attack cancerous lesions.

Key takeaways

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

Reference excerpt

Theranostics, or theragnostics, refers to the combination of diagnosis and therapy (treatment) of disease in a single medical intervention or technique. For example, a combination of radioactive isotopes may be administered to simultaneously identify and attack cancerous lesions. Typically theranostic approaches involve a medical imaging component, such as radiotracers, contrast agents, positron emission tomography, and magnetic resonance imaging. The term "theranostic" is a portmanteau of two words, therapeutic and diagnostic. The first known use of the term is attributed to John Funkhouser, a consultant for the company Cardiovascular Diagnostic, who used it in a press release in August 1998. Nanotheranostics is the specialization of theranostics in the nanoscale.

Applications

Nuclear medicine Theranostics originated in the field of nuclear medicine; iodine isotope 131 for the diagnostic study and treatment of thyroid cancer was one of its earliest applications. Nuclear medicine encompasses various substances, either alone or in combination, that can be used for diagnostic imaging and targeted therapy. These substances may include ligands of receptors present on the target tissue or compounds, like iodine, that are internalized by the target through metabolic processes. By using these mechanisms, theranostics enables the localization of pathological tissues with imaging and the targeted destruction of these tissues using high doses of radiation.

Theranostic pairs When two isotopes of an element form a theranostic agent they can be called a theranostic pair, eg. Cu-64 and Cu-67. Cu-64 emits positrons for imaging in PET scans, and Cu-67 is a beta emitter to kill targeted cells.

Radiological scope Contrast agents with therapeutic properties have been under development for several years. One example is the design of contrast agents capable of releasing a chemotherapeutic agent locally at the target site, triggered by a stimulus provided by the operator. This localized approach aims to increase treatment efficacy and minimize side effects. For instance, ultrasound-based contrast media, such as microbubbles, can accumulate in hypervascularized tissues and release the active ingredient in response to ultrasound waves, thus targeting a specific area chosen by the sonographer. Another approach involves linking monoclonal antibodies (capable of targeting different molecular targets) to nanoparticles. This strategy enhances the drug's affinity and specificity towards the target and enables visualization of the treatment area, such as using superparamagnetic iron oxide particles detectable by magnetic resonance imaging. Additionally, these particles can be designed to release chemotherapy agents specifically at the site of binding, producing a local synergistic effect with antibody action. Integrating these methods with medical-nuclear techniques, which offer greater imaging sensitivity, may aid in target identification and treatment monitoring.

Imaging techniques

Positron emission tomography Positron emission tomography (PET) imaging in theranostics provides insight into metabolic and molecular processes within the body. The PET scanner detects photons and creates three-dimensional images that enable visualization and quantification of physiological and biochemical processes. PET imaging uses radiotracers that target specific molecules or processes. For example, [18F] fluorodeoxyglucose (FDG) is commonly used to assess glucose metabolism, as cancer cells exhibit increased glucose uptake. Other radiotracers target specific receptors, enzymes, or transporters, allowing the evaluation of various physiological and pathological processes. PET imaging plays a role in both diagnosis and treatment planning. It aids in the identification and staging of diseases, such as cancer, by visualizing the extent and metabolic activity of tumors. PET scans can also guide treatment decisions by assessing treatment response and monitoring disease progression. Additionally, PET imaging is used to determine the suitability of patients for targeted therapies based on specific molecular characteristics, enabling personalized treatment approaches.

Single-photon emission computed tomography Single-photon emission computed tomography (SPECT) is employed in theranostics, using gamma rays emitted by a radiotracer to generate three-dimensional images of the body. SPECT imaging involves the injection of a radiotracer that emits single photons, which are detected by a gamma camera rotating around the person undergoing imaging. SPECT provides functional and anatomical information, allowing the assessment of organ structure, blood flow, and specific molecular targets. It is useful in evaluating diseases that involve altered blood flow or specific receptor expression. For example, SPECT imaging with technetium-99m (Tc-99m) radiopharmaceuticals may be able to assess myocardial perfusion and identify areas of ischemia or infarction in patients with cardiovascular diseases. SPECT imaging helps in identifying disease localization, staging, and assessing the response to therapy. Moreover, SPECT imaging is employed in targeted radionuclide therapy, where the same radiotracer used for diagnostic imaging can be used to deliver therapeutic doses of radiation to the diseased tissue.

Magnetic resonance imaging Magnetic resonance imaging (MRI) is a non-invasive imaging technique that uses strong magnetic fields and radiofrequency pulses to generate detailed anatomical and functional images of the body. MRI provides excellent soft tissue contrast and is widely used in theranostics for its ability to visualize anatomical structures and assess physiological processes. In theranostics, MRI allows for the detection and characterization of tumors, assessment of tumor extent, and evaluation of treatment response. MRI can provide information on tissue perfusion, diffusion, and metabolism, aiding in the selection of appropriate therapies and monitoring their effectiveness. Advancements in MRI technology have expanded its capabilities in theranostics. Techniques such as functional MRI (fMRI) enable the assessment of brain activation and connectivity, while diffusion-weighted imaging (DWI) provides insights into tissue microstructure. The development of molecular imaging agents, such as superparamagnetic iron oxide nanoparticles, allows for targeted imaging and tracking of specific molecular entities.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Theranostics

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

In research: Theranostics 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 Theranostics 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: Theranostics is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1998 neologisms, Diagnostic radiology, Medicinal radiochemistry, so understanding it makes those chapters shorter.
In everyday life: Look for Theranostics 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Theranostics in 20 minutes

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

Frequently asked questions

What is Theranostics in simple terms?

Why does Theranostics 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 Theranostics?

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 Theranostics.