On June 1, 2026 ITM Isotope Technologies Munich SE (ITM), a leading radiopharmaceutical biotech company, reported new single-timepoint dosimetry data from its Phase 3 COMPETE trial in patients with gastroenteropancreatic neuroendocrine tumors (GEP-NETs). The data were presented in a poster presentation at the Society of Nuclear Medicine and Molecular Imaging (SNMMI) Annual Meeting, held from May 30 – June 2, 2026, in Los Angeles, CA.

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As previously reported at ENETS 2025, the Phase 3 COMPETE trial met its primary endpoint, with 177Lu-edotreotide (ITM-11) demonstrating clinically and statistically significant improvement in progression-free survival compared to everolimus (23.9 vs. 14.1 months; p=0.022). Results from a prospective dosimetry sub-study of COMPETE were presented at EANM 2025. Data, which included one of the largest prospective dosimetry datasets ever generated in a Phase 3 radiopharmaceutical trial, demonstrated that 177Lu-edotreotide (ITM-11) delivered targeted radiation to tumors while maintaining healthy organ exposure well below established safety thresholds. Building on this dataset, investigators applied PBMS NLMEM modeling to evaluate whether accurate individualized dose estimates for kidneys and tumors could be achieved from a single imaging session.

"Individualized dosimetry has long been recognized as clinically valuable in radiopharmaceutical therapy, but widespread implementation has been limited by the complexity and burden of repeated imaging procedures," said Dr. Deni Hardiansyah, co-author and associate professor at the University of Indonesia. "These findings demonstrate that a population-based modeling approach may enable accurate dosimetry estimates using substantially fewer imaging timepoints, supporting more practical integration into routine clinical practice."

The analysis utilized dosimetry data from patients treated with 177Lu-edotreotide in the Phase 3 COMPETE trial, including planar and SPECT/CT imaging data collected from 207 kidney datasets and 154 tumor datasets. Investigators evaluated the accuracy of PBMS NLMEM-derived single-timepoint dosimetry estimates compared with established Madsen and Hänscheid approaches.

Key findings included:

The PBMS NLMEM approach accurately estimated absorbed doses for both kidneys and tumors using a single imaging timepoint, achieving mean absolute percentage error (MAPE) values of 3–20% for kidney dosimetry across evaluated timepoints
PBMS NLMEM outperformed comparator single-timepoint dosimetry methods with respect to MAPE and R20 for kidney absorbed dose estimation across all evaluated timepoints
Findings suggest individualized dosimetry may be achievable with just one scan approximately six hours after treatment, offering an alternative for centers with limited imaging capacity and potentially expanding the routine use of personalized dosimetry
"These data build on the extensive dosimetry dataset generated through the COMPETE trial and reflect ITM’s continued commitment to advancing precision radiopharmaceutical therapy," said Dr. Celine Wilke, chief medical officer of ITM. "The possibility of accurate, same-day dosimetry from a single scan may help reduce patient burden and workflow complexity, as well as reduce inter-center disparities, making personalized dosimetry practical for a far broader range of clinical settings."

About the COMPETE Trial
The COMPETE trial (NCT03049189) evaluated 177Lu-edotreotide (ITM-11), a proprietary, synthetic, targeted radiotherapeutic investigational agent compared to everolimus, a targeted molecular therapy, in patients with inoperable, progressive Grade 1 or Grade 2 gastroenteropancreatic neuroendocrine tumors (GEP-NETs). This trial met its primary endpoint, with 177Lu-edotreotide demonstrating clinically and statistically significant improvement in progression-free survival (PFS) compared to everolimus. 177Lu-edotreotide is an investigational product pending review by the U.S. Food and Drug Administration (FDA) and is not approved by any regulatory authority for the safety and/or efficacy of any intended use. It is also being evaluated in COMPOSE, a Phase 3 study in patients with well-differentiated, aggressive Grade 2 or Grade 3, somatostatin receptor (SSTR)-positive GEP-NETs.

(Press release, ITM Isotopen Technologien Munchen, JUN 1, 2026, View Source [SID1234666355])