Alpha-emitter PRRT: A Phase 2 Open Label Study to Evaluate the Safety and Effectiveness of 212Pb-DOTAMTATE in PRRT Naive Subjects With SSTR Expressing NET

Ebrahim S Delpassand, Izabela Tworowska, Rouzbeh Esfandiari, Julien Torgue, Jason Hurt, Afshin Shafie and Rodolfo Núñez Journal of Nuclear Medicine, January 2022, jnumed.121.263230; DOI:
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Update 16th May 2023. 

Trial’s Objective Response Rate Endpoint Already Achieved. 

RadioMedix and Orano Med, two clinical stage radiopharmaceutical companies, today announced that the last patient has been dosed in the Phase II trial of the targeted alpha emitter therapy, 212Pb-DOTAMTATE (AlphaMedix™). This trial is being conducted to evaluate the safety and effectiveness of AlphaMedix™ in peptide receptor radionuclide therapy (PRRT) of naive patients with somatostatin receptor-expressing neuroendocrine tumors (NET), regardless of the location of the primary tumor. Top-line data from the trial is expected in mid-2024. Remarkably, based on data already collected, the objective response rate (ORR) endpoint has already been achieved and is more than twice as high as the current standard of care.  Read more here

What is Alpha-emitter PRRT? 

Substitution of an alpha emitter (e.g. ²¹²Pb) for the beta emitters currently being used (i.e., 177Lu or 90Y) will provide significantly higher Linear Energy Transfer (LET) and a shorter path length. Higher LET particles should cause more tumour cell death. Shorter path length should result in less collateral damage of the normal tissue and therefore less side effects for subjects receiving the drug.

Trial Summary

AlphaMedix™ (²¹²Pb-DOTAMTATE) is a radiotherapeutic drug indicated in subjects with unresectable, metastatic somatostatin receptor (SSTR) positive neuroendocrine tumors (NETs). Because 212Pb is an in vivo generator of alpha particles, it is particularly suitable for SSTR therapy applications, i.e. it’s a type of PRRT. 

This drug addresses an unmet need in the field of peptide receptor radionuclide therapy (PRRT) for NETs. Substitution of an alpha emitter (²¹²Pb) for the beta emitters currently being used (i.e., 177Lu or 90Y) will provide significantly higher Linear Energy Transfer (LET) and a shorter path length. Higher LET particles should cause more tumor cell death. A shorter path length should result in less collateral damage to the normal tissue and therefore fewer side effects for subjects receiving the drug.

The phase 1 trial completed in July 2022 and we await news on any early Phase 2 data.

A Phase 2 Open Label Study to Evaluate the Safety and Effectiveness of 212Pb-DOTAMTATE in PRRT Naive Subjects With Somatostatin Receptor Expressing Neuroendocrine Tumors. 

Actual Study Start Date :December 21, 2021
Estimated Primary Completion Date :December 1, 2022
Estimated Study Completion Date :December 1, 2023

Read more detail about the phase 2 trial announcement by clicking here

Source: Targeted Alpha-Emitter Therapy With 212Pb-DOTAMTATE for the Treatment of Metastatic SSTR-Expressing Neuroendocrine Tumors: First-in-Human, Dose-Escalation Clinical Trial

Ebrahim S DelpassandIzabela TworowskaRouzbeh EsfandiariJulien TorgueJason HurtAfshin Shafie and Rodolfo Núñez

The source document above includes a picture of one patient from Phase 1 who appears to have had a great response (a lung NET) but remember, this may not be the same response in all participants. 

Ebrahim S Delpassand, Izabela Tworowska, Rouzbeh Esfandiari, Julien Torgue, Jason Hurt, Afshin Shafie and Rodolfo Núñez Journal of Nuclear Medicine, January 2022, jnumed.121.263230; DOI:

Read more here

1.  Phase 1 Identifier:  NCT03466216
2.  Phase 2 Identifier: NCT05153772
3.  Targeted Alpha Therapy (PRRT) blog post – click here

Click on the picture to read more

Other trials for Alpha-Emitter PRRT

The industry has settled on two different radionuclides so far, AC225 and Pb212.  This blog post covers 212Pb but AC225 is also another option.  The biggest trial is contained in this post below.  Click here or on the picture to read more.

Click the picture to read more

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. 



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.


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

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