In the News.
On the heels of the approval of PRRT in USA and whilst we all wait on positive national announcements of PRRT approval in UK and elsewhere, here’s news of a new PRRT compound undergoing a phase 3 clinical trial. Isotopen Technologien München AG (ITM), a specialized radiopharmaceutical company, today announced the enrolment of the first patient recruited in Europe for the COMPETE phase III clinical trial at the University Hospital Marburg, Germany. The CEO of ITM said “This marks the starting point of COMPETE in Europe, whereby we expect a rapid increase in the number of recruits.” I actually met these guys at ENETS 2018 – sounds great.
What is the COMPETE trial?
COMPETE is led as an international pivotal multi-center phase III clinical trial evaluating the efficacy and safety of (no-carrier-added) n.c.a.177Lu-Edotreotide (Solucin®) and the trial is comparing it to Everolimus (Afinitor). The trial runs until Dec 2020. The enrolment requires patients with inoperable, progressive, somatostatin-receptor positive neuroendocrine tumors of gastroenteric or pancreatic origin (GEP-NET). The primary endpoint is progression-free survival (PFS). The study will be conducted predominantly in Europe, North America, South Africa and Australia (ITM is waiting on FDA clearance to include North American locations in the trial). The first patient to be enrolled and treated was in Australia. The clinical trial document (see references below) indicates its for non-functional GI tumours but for non-functional and functional pNETs. The list of locations can also be found in the clinical trial document. The usual inclusion/exclusion rules apply but the most notable would appear to be an exclusion for those with prior exposure to any PRRT or mTor inhibitor such as Everolimus (Afinitor).
What is 177Lu-Edotreotide (Solucin®) ?
The compound under investigation, Solucin®, is known as a Targeted Radionuclide Therapy (TRT) agent, which consists of the targeting molecule Edotreotide, an octreotide-derived somatostatin analogue and ITM´s EndolucinBeta® (no-carrier-added Lutetium-177). EndolucinBeta® is a synthetic, low-energy beta-emitting isotope of Lutetium, a recently EMA approved pharmaceutical precursor. The radiopharmaceutical Solucin® is administered as an intravenous infusion, specifically targeting and destroying the tumor cells with ionizing radiation. Solucin® received an Orphan Designation (EMA/OD/196/13) for the treatment of GEP-NET, based on early clinical experience, which has demonstrated a substantial clinical benefit with increased PFS and quality of life.
From ITM’s website … “Edotreotide contains DOTA which functions as a chelator for radioisotopes and TOC, a synthetic Somatostatin receptor ligand” (chelator and ligand are just fancy names for ‘bonding’ or ‘binding’). “The compound Edotreotide binds with high affinity Somatostatin receptors and retains both its receptor binding properties and its physiological function when labeled with 177Lu. Somatostatin receptors are predominantly overexpressed by neuroendocrine tumors. 177Lu-Edotreotide, upon binding to Somastotatin receptors in vivo is internalized and retained by tumor cells.”
“Compared to 90Y-Edotreotide, 177Lu-Edotreotide Targeted Radionuclide Therapy in NET was found to be less haematotoxic and associated with a longer median overall survival. That was highly significant for patients with low tumor uptake as well as for patients with extra hepatic and solitary metastases. In a retrospective Phase II trial 177Lu-Edotreotide showed a low uptake/dose delivered to normal organs and very high tumor-to-kidney ratio.”
Other Spin offs from ITM
Interestingly the company is also working on a ‘theranostic pair’ for imaging and treating bone metastases – see graphic below. It does not say whether this includes NET bone metastases but I don’t see why not given the connection with Solucin. However, please note this is some years away from fruition.
1. ITM News Release – click here
2. ITM Website – click here
3. Clinical Trials Document – click here
4. FDA authorises trial to go ahead in USA – click here
5. Useful video about the trial – click here
Thanks for reading