What is Satoreotide?
It’s an agonist treatment. i.e. a ‘next generation’ radioligand for Peptide receptor radionuclide therapy (PRRT) or more specifically the radiopharmaceutical that binds to both activated and inactivated somatostatin receptors which are upregulated on these tumours. There is far higher binding via this mechanism than standard octreotate. The technical name of the radiopharmaceutical is Satoreotide tetraxetan lutetium-177 (author’s note, I’m guessing but it could be a variant of Lanreotide).
Somatostatin type 2 (SST2) receptor is overexpressed in many around 80% of NETs, some NEC and in certain hard-to-treat cancers such as small cell lung cancer (SCLC) and neuroblastoma, an aggressive, rare type of cancer that occurs mainly in young children.
It was once named JR11 when owned by Ipsen (see history below).
The term ‘antagonist’ is important and note that most PRRT in use is ‘agonist’. The differences are quite technical but hopefully, I explained them below.
Update 11th November 2025 – Ariceum Therapeutics Doses First Patient in SANTANA-225 Phase 1/2 Clinical Trial of 225Ac-SSO110 in Patients with Extensive-Stage Small Cell Lung Cancer or Merkel Cell Carcinoma. Click here to read more. Worth noting that the use of 225Ac means it is now an alpha-emitter PRRT.
Update 6th February 2025. U.S. FDA Grants Orphan Drug Designation to Ariceum Therapeutics’ Proprietary Radiopharmaceutical Cancer Therapy. Click here to read more.
Update 14th January 2025. FDA Clears Ariceum Therapeutics’ 225Ac-Satoreotide Phase I/II Clinical Study in Patients with Small Cell Lung Cancer or Merkel Cell Carcinoma. Click here to read more.
History
This drug was once owned by Ipsen when it was known as JR11 or OPS 201, but they decided to sell it off. In Jun 2022, Ariceum Therapeutics (Ariceum), a private biotech company developing a radiopharmaceutical product for the diagnosis and systemic targeted radiation therapy of certain hard-to-treat cancers, announced the successful investment source of EURO 25 million. The proceeds from the financing will enable Ariceum to further develop its lead asset and proprietary peptide derivative, satoreotide. Ipsen remains a shareholder in the company.
It was interesting to note in the JR11 trial that Satoreotide can be used as a ‘theranostic’ for both the diagnosis and treatment of tumours expressing the SST2 receptor. There is evidence of the existence of a Ga68 PET using Satoreotide, known as 68Ga-Satoreotide Trizoxetan (SSO120). The data looked favourable against regular G68 Dotatate – click here.
What’s the difference ‘agonist’ and ‘antagonist’?
Conventional beta PRRT (e.g. Lutathera, Lu177 Dotatate) is based on a somatostatin receptor ‘agonist’ approach, whereas 177Lu Satoreotide is a receptor ‘antagonist’. The differences are quite technical but in the most layman terms, the antagonist has the capability of attaching (binding) to more receptors, including those in a ‘resting’ or ‘inactive’ state, spends more time on the tumor than agonist-based therapies. The result is a higher number of receptor binding sites and greater tumor uptake. In addition, it is said to show an improved tumor-to-kidney dose ratio compared to the agonist 177Lu-DOTA-TATE.
This would also be reflected in the theranostic use of the drug in Ga68 imaging (i.e. Ga68 Satoreotide).
Trial Summary (Ariceum)
The existence of the record in my normal source (Clinical Trials dot Gov) is confusing as the original Ipsen trial is there marked as terminated but has been updated in 2023. That said, the clinical trial output in 2023 still quotes the original trial number so it may be that it remains out of date in terms of the usual criteria listed in such documents. I will keep my eye on it being updated.
This announcement from the new owner confirms a new trial is underway managed by the new owners.
This citation below will give you the more detail about the above clinical trial activity.
Wild, D., Grønbæk, H., Navalkissoor, S. et al. A phase I/II study of the safety and efficacy of [177Lu]Lu-satoreotide tetraxetan in advanced somatostatin receptor-positive neuroendocrine tumours. Eur J Nucl Med Mol Imaging (2023). https://doi.org/10.1007/s00259-023-06383-1
This document also confirms a separate clinical trial for SCLC (technically a form of Lung Neuroendocrine Carcinoma) which is normally treated by Lung MDTs.
I’m still looking for an update on the new clinical trial managed by Ariceum but for information purposes only until I confirm, the original trial locations (or which are showing now) are Australia (Melbourne and Perth), Austria (Vienna), Canada (CHU de Quebec), Denmark (Aarhus), Switzerland (Basel), UK (Royal Free London), France (Nantes and Toulouse), MD Anderson Texas USA. There is also mention of a site in USA carried out a similar trial at MSK New York where the sponsors reported “In this trial of heavily treated NETs, preliminary data are promising for the use of 177Lu-satoreotide tetraxetan. Additional studies are ongoing to determine optimal therapeutic dose/schedule” – results of the MSK trial were posted here. However, see updates above 6th Feb 25 and 14 Jan 25.
Why is this trial important?
Around 20% of NET patients have no or inefficient somatostatin receptors. This type of treatment could open up more access to PRRT for those with insufficient/inefficient receptors.
Read more of the history here
- Original Ipsen clinical trial (information only) – Study Details | Study to Evaluate the Safety and Preliminary Efficacy of 177Lu-OPS201 in NETs | ClinicalTrials.gov
- New trial info – https://clinicaltrials.gov/study/NCT05017662
- Trial update of the Ariceum sponsored activity in NETs – Wild, D., Grønbæk, H., Navalkissoor, S. et al. A phase I/II study of the safety and efficacy of [177Lu]Lu-satoreotide tetraxetan in advanced somatostatin receptor-positive neuroendocrine tumours. Eur J Nucl Med Mol Imaging (2023). https://doi.org/10.1007/s00259-023-06383-1
- Company announcement on NET trial – Ariceum Therapeutics’ targeted radiopharmaceutical 177Lu-satoreotide exhibits promising clinical response and good tolerability profile in patients with advanced neuroendocrine tumours – Ariceum Therapeutics (ariceum-therapeutics.com)
See also this more modern antagonist product aimed at regular NET
Disclaimer
I am not a doctor or any form of medical professional, practitioner or counsellor. None of the information on my website, or linked to my website(s), or conveyed by me on any social media or presentation, should be interpreted as medical advice given or advised by me.
Neither should any post or comment made by a follower or member of my private group be assumed to be medical advice, even if that person is a healthcare professional.
Please also note that mention of a clinical service, trial/study or therapy does not constitute an endorsement of that service, trial/study or therapy by Ronny Allan, the information is provided for education and awareness purposes and/or related to Ronny Allan’s own patient experience. This element of the disclaimer includes any complementary medicine, non-prescription over the counter drugs and supplements such as vitamins and minerals.
General Clinical Trials Disclaimer
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided in the clinical trials document. It’s very important to check the trial inclusion and exclusion criteria before making any contact. If you need questions, the articles here is very useful Questions to Ask About Clinical Trials | Cancer.Net
The inclusion of any trial within this blog should not be taken as a recommendation by Ronny Allan.
Finally
Whenever I post about a trial or study, some people get excited without understanding that these new treatments and capabilities can very often take years to come to fruition and it’s also possible that clinical trials can be halted, or that national approval agencies will not approve the final product. Plus, not everyone will be eligible, so always check the exclusion and inclusion criteria in the relevant clinical trials document. Please bear that in mind when reading studies/clinical trials posted on RonnyAllan.NET
Click here to enter Ronny’s Clinical Trials Archive
Click here and answer all questions to join my private Facebook group
Check out my Glossary of Terms – click here
Please Share this post for Neuroendocrine Cancer awareness and to help another patient
- Spotlight on Thymic Neuroendocrine Neoplasms (Thymic NENs)
Disclaimer:The information in this Spotlight is for general education and awareness. It does not replace personalised medical advice, diagnosis, or treatment. Thymic Neuroendocrine Neoplasms (NENs) are complex and highly variable, and individual cases may differ significantly from the patterns described here. Always discuss your own situation, test results, and treatment options with your specialist team,… Read more: Spotlight on Thymic Neuroendocrine Neoplasms (Thymic NENs) - An unmissable update from Ronny Allan covering April 2026
A monthly update not to miss……..Summary of April 2026 on RonnyAllan.NET I think the main story of April is similar to March which was a strong blog performance. Some of March was so popular that it has rolled into April and I have tried to beat those figures but failed due to external pressures. Nonetheless, the… Read more: An unmissable update from Ronny Allan covering April 2026 - Spotlight on Small intestine Neuroendocrine Neoplasms (siNENs)
DisclaimerThis Spotlight is for general education and reassurance only. It cannot replace personalised advice from your own medical team, who understand your individual history, imaging, pathology, and treatment needs. Neuroendocrine tumours vary widely in behaviour, presentation, and management, and guidance may evolve as new evidence emerges. If you have questions about your diagnosis, symptoms, or… Read more: Spotlight on Small intestine Neuroendocrine Neoplasms (siNENs) - A Spotlight on Pancreatic Neuroendocrine Neoplasms
DisclaimerThe information in this Spotlight is for general education only. It cannot replace advice from your own medical team, who know your individual situation, test results, and treatment options. Neuroendocrine Neoplasms and related conditions are complex and research is evolving; guidance, classifications, and statistics may change over time. Always discuss any questions or concerns with… Read more: A Spotlight on Pancreatic Neuroendocrine Neoplasms - Neuroendocrine Cancer in UK – a growing crisis?
I was delighted to read about the efforts of Dr Arthur Scott, a Member of the UK Parliament (MP). He is a great advocate for cancer patients and recently introduced a rare cancer bill in the UK Parliament which will hopefully make a difference. The content was very interesting and I was drawn to several… Read more: Neuroendocrine Cancer in UK – a growing crisis? - Bone Metastases in Well‑Differentiated NETs – Part 2 – Treatment
DisclaimerThis information is for education and reassurance only.It is not a substitute for personalised medical advice, diagnosis, or treatment. Bone metastases in neuroendocrine tumours (NETs) vary widely in behaviour, appearance, and clinical significance. Decisions about systemic therapy, radiotherapy, ablation, bone‑targeted agents, surgery, or monitoring must be made by your own specialist NET team, who understand… Read more: Bone Metastases in Well‑Differentiated NETs – Part 2 – Treatment - Neuroendocrine Tumours – Vitamin B3 (Niacin)
Before you read thisThis information is designed to help you understand how vitamins work in the body and how certain NET-related factors might affect them. It is not a substitute for personalised medical advice. Every NET patient is different — tumour type, treatments, surgery, symptoms, and nutritional needs can vary widely. If you have concerns… Read more: Neuroendocrine Tumours – Vitamin B3 (Niacin) - March 2026 Newsletter from Ronny Allan
Here is my monthly summary of March 2026 on RonnyAllan.NET This has been a very good month but to be honest, I had more time at home and on my computer, due to illness. OK I was not that ill that I could not tap away at a keyboard! However, it was pretty erratic access. I… Read more: March 2026 Newsletter from Ronny Allan - Understanding Differentiation, Ki‑67, Mitotic Count, Hotspots, Pathology Workflow, and Primary–Metastasis Heterogeneity in Neuroendocrine Neoplasms (NENs)
Before you read this… This article discusses pathology concepts such as Ki-67, grading, heterogeneity, and biopsy findings in neuroendocrine tumours (NETs). It is provided for educational purposes only and does not interpret any individual pathology report or scan result. Ki-67 values, tumour grade, and sampling limitations can vary between different biopsies and over time. Their… Read more: Understanding Differentiation, Ki‑67, Mitotic Count, Hotspots, Pathology Workflow, and Primary–Metastasis Heterogeneity in Neuroendocrine Neoplasms (NENs) - Why liver transplant is back in the NET conversation
Before you read this… This article is provided to support understanding of a complex and evolving topic. It explains how liver transplant is being explored in a very small number of NET patients, but it is not suggesting that this treatment is suitable for you or anyone else. Every NET case is unique. Only your… Read more: Why liver transplant is back in the NET conversation - This too shall pass
If you’ve heard that phrase before, you’re not alone. The phrase is rooted in older Persian and Buddhist teachings, and widely accepted as a testament to the impermanence of all things. Many famous people have used this phrase including Abraham Lincoln, Tom Hanks, Robert De Niro and King Solomon. I’ve also seen various cancer bloggers… Read more: This too shall pass - HRT and Neuroendocrine Tumours (NETs): What Patients Need to Know
Before you read this… This article discusses hormone replacement therapy (HRT) in the context of general health, menopause, and neuroendocrine tumours (NETs). It is provided for educational purposes only and does not recommend starting, stopping, or changing any form of HRT. The suitability of HRT depends on many individual factors, including tumour type, grade, hormone… Read more: HRT and Neuroendocrine Tumours (NETs): What Patients Need to Know - Blood Clot risks in Neuroendocrine Neoplasms (NENs)
I have a personal interest in this subject because I had pulmonary emboli (PE) diagnosed in January 2011 around 6 weeks after I had major surgery. I got a phone call from the hospital to go down that day and meet with a nurse who would teach me to self inject ‘Clexane'(Enoxaparin) and then take… Read more: Blood Clot risks in Neuroendocrine Neoplasms (NENs) - Neuroendocrine Tumours (NETs) – Vitamin D (Cholecalciferol / Ergocalciferol)
Before you read thisThis information is designed to help you understand how vitamins work in the body and how certain NET-related factors might affect them. It is not a substitute for personalised medical advice. Every NET patient is different — tumour type, treatments, surgery, symptoms, and nutritional needs can vary widely.If you have concerns about… Read more: Neuroendocrine Tumours (NETs) – Vitamin D (Cholecalciferol / Ergocalciferol) - Cancer: Words are important but so is context
Words are very important to cancer patients, some people hang their hats on them and put their feet up, and some people google them until they are tied in a knot, still fraught with worry. Why can’t doctors just tell me in layman’s language? Easy answer ……. because it is not an exact science. Doctors… Read more: Cancer: Words are important but so is context - Newsletter covering January and February 2026
Overview Many thanks for the support in January and February 2026. This is a double month newsletter due to my 27 day holiday! 2026 Blog Activity for January and February Actually, despite my holiday figures are pretty much normal. I had a great month in December 2025, perhaps I was overperforming as I was anticipating… Read more: Newsletter covering January and February 2026
Please Share this post for Neuroendocrine Cancer awareness and to help another patient
Discover more from Ronny Allan - Living with Neuroendocrine Cancer
Subscribe to get the latest posts sent to your email.
Has anyone tried this. What’s it like?
I think there is 1 or maybe 2 people in my private patient group
How would this compare to mibg therapy?
much more modern tech. mibg mainly for pheochromoctyoma/paraganglioma ?
Wow, haven’t even had the one this is going to supercede yet! Thanks for the info Ronny.