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View all newsTheranostics or theragnostics?
This is our perspective on recent years’ debate regarding how to spell this fascinating word: “Theranostics” or “Theragnostics”? Both spellings have a long history of use. It is understood that both versions refer to the treatment strategy that combines therapeutics with diagnostics, and the word is derived from the Greek words therapia and diagnosis.
In our search for answers following the debate in recent years, we came upon an interesting article¹. We believe that Prof. George Babiniotis, Emeritus and Honorary Professor of Linguistics and former Rector (2000–2006) of the University of Athens, has excellent and credible thoughts. Our position is based on his reasoning. In the article, Prof. Babiniotis explains the following:
“Theragnostics is the better term. In theranostics, the second part of the word “nostics” refers more to the disease than diagnostics. Linguistically, the better approach is a synergy of the two words therapo-gnostics because “thera” alone does not refer to therapy and could be confused with the Greek word for hunting.”
Babiniotis argues that it is essential to understand that the key to the term “theragnostics” is “gnosis”, not “agnosis”, whereas “agnosis” is derived from the Greek word agnosia , which means a lack of knowledge. Thus, “theragnostics” is a better term emphasising knowledge, and as the article elegantly summarises “, nuclear medicine with its combination of molecular imaging and molecular radiotherapy does indeed offer knowledge-based precision medicine”.
Reference: ¹https://link.springer.com/article/10.1007/s00259-018-4204-z
World Theragnostics Day 2025
This marks the day when Dr Saul Hertz on March 31st, 1941, made history by administering the first radioiodine treatment at Massachusetts General Hospital. A groundbreaking moment in medical history! The word theragnostics is cool but also derived from the Greek words therapia and diagnosis. Pretty neat, right?
By bridging the gap between diagnosis and treatment, it’s paving the way for a paradigm shift in care of complex diseases such as cancer. The method has real potential in nuclear medicine, where radioactive isotopes are used for both diagnostic imaging studies and targeted treatment. That’s the beauty of theragnostics!
Theragnostics opens doors to more hopeful treatment for patients with complex diseases and are on the way to changing cancer care to be more tailored and patient-centered.
Not quite sure what theragnostics is all about? No worries, backed by 25+ years in nuclear medicine, we’re experts in the field. Here’s a quick crash course to fill in some knowledge gaps:
Theranostics or theragnostics?

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