Perspective Therapeutics Presents Updates at the 37th Annual Congress of the European Association of Nuclear Medicine
Perspective Therapeutics (NYSE AMERICAN: CATX) presented six updates on its radiopharmaceutical programs at the 37th Annual EANM Congress in Hamburg. The presentations included preclinical studies and first-in-human imaging data for [212Pb]Pb-PSV359, showing strong tumor uptake and anti-tumor efficacy. Updates on [212Pb]Pb-VMT-α-NET revealed promising interim clinical results in NET patients, with confirmed tumor responses in six of ten GEP-NETs patients. The presentations also covered biodistribution studies, chelator evaluations, and development of imaging surrogates for therapeutic radiopharmaceuticals.
Perspective Therapeutics (NYSE AMERICAN: CATX) ha presentato sei aggiornamenti riguardo ai suoi programmi di radiofarmaci al 37° Congresso Annuale EANM ad Amburgo. Le presentazioni hanno incluso studi preclinici e dati di imaging di prima arruolazione sull’uomo per [212Pb]Pb-PSV359, dimostrando un forte assorbimento tumorale e un'efficacia anti-tumorale. Gli aggiornamenti su [212Pb]Pb-VMT-α-NET hanno rivelato risultati clinici provvisori promettenti nei pazienti con NET, con risposte tumorali confermate in sei pazienti su dieci con GEP-NETs. Le presentazioni hanno anche trattato studi di biodistribuzione, valutazioni di chelatori e lo sviluppo di surrogate di imaging per radiofarmaci terapeutici.
Perspective Therapeutics (NYSE AMERICAN: CATX) presentó seis actualizaciones sobre sus programas de radiofármacos en el 37° Congreso Anual de EANM en Hamburgo. Las presentaciones incluyeron estudios preclínicos y datos de imagen de primera aplicación en humanos para [212Pb]Pb-PSV359, mostrando una fuerte captación tumoral y eficacia anti-tumoral. Las actualizaciones sobre [212Pb]Pb-VMT-α-NET revelaron resultados clínicos interinos prometedores en pacientes con NET, con respuestas tumorales confirmadas en seis de diez pacientes con GEP-NETs. Las presentaciones también cubrieron estudios de biodistribución, evaluaciones de quelantes y el desarrollo de surrogados de imagen para radiofármacos terapéuticos.
퍼스펙티브 치료제 (NYSE AMERICAN: CATX)는 함부르크에서 열린 제37회 EANM 연례 회의에서 방사성 의약품 프로그램에 대한 여섯 가지 업데이트를 발표했습니다. 발표에는 [212Pb]Pb-PSV359에 대한 전임상 연구와 최초의 인간 이미지 데이터가 포함되어 있으며, 강력한 종양 흡수와 항종양 효능을 보여주었습니다. [212Pb]Pb-VMT-α-NET에 대한 업데이트는 NET 환자에서 임상적 결과가 유망함을 나타냈으며, 10명의 GEP-NETs 환자 중 6명에서 종양 반응이 확인되었습니다. 발표는 또한 생체 분포 연구, 킬레이트 평가 및 치료 방사성 의약품을 위한 영상 대리 개발을 다루었습니다.
Perspective Therapeutics (NYSE AMERICAN: CATX) a présenté six mises à jour sur ses programmes de radio-pharmaceutiques lors du 37e Congrès annuel de l'EANM à Hambourg. Les présentations ont inclus des études précliniques et des données d'imagerie de première utilisation chez l'homme pour [212Pb]Pb-PSV359, montrant une forte absorption tumorale et une efficacité anti-tumorale. Les mises à jour sur [212Pb]Pb-VMT-α-NET ont révélé des résultats cliniques intermédiaires prometteurs chez des patients atteints de NET, avec des réponses tumorales confirmées chez six des dix patients atteints de GEP-NETs. Les présentations ont également couvert des études de biodistribution, des évaluations de chélateurs et le développement de substituts d'imagerie pour les radio-pharmaceutiques thérapeutiques.
Perspective Therapeutics (NYSE AMERICAN: CATX) hat auf dem 37. jährlichen EANM-Kongress in Hamburg sechs Updates zu seinen Radiopharmazeutikprogrammen vorgestellt. Die Präsentationen umfassten präklinische Studien und erste bildgebende Daten beim Menschen für [212Pb]Pb-PSV359, die eine starke Tumoraufnahme und antitumorale Wirksamkeit zeigten. Updates zu [212Pb]Pb-VMT-α-NET enthüllten vielversprechende vorläufige klinische Ergebnisse bei NET-Patienten mit bestätigten Tumorreaktionen bei sechs von zehn GEP-NET-Patienten. Die Präsentationen behandelten zudem Biodistributionsstudien, Evaluierungen von Chelatoren und die Entwicklung von Bildsuche für therapeutische Radiopharmazeutika.
- Strong binding affinity and selectivity demonstrated for [212Pb]Pb-PSV359 in preclinical studies
- Confirmed tumor responses in 6 out of 10 GEP-NETs patients treated with [212Pb]Pb-VMT-α-NET
- Well-tolerated treatment profile with manageable adverse effects
- Further investigation needed for Pb-212 imaging and dosimetry validation
- Long-term survival data still pending
Insights
The updates from EANM reveal significant progress in Perspective Therapeutics' radiopharmaceutical pipeline. The first-in-human data for [212Pb]Pb-PSV359 shows promising results with strong tumor uptake and minimal off-target effects. Most notably, in the interim results for [212Pb]VMT-α-NET,
The dosimetry and biodistribution studies validate the therapeutic approach, showing rapid tumor accumulation and efficient renal clearance. The optimization work on chelators and molar activity demonstrates a sophisticated understanding of delivery mechanisms, potentially leading to improved therapeutic windows. These developments suggest a strong foundation for future clinical applications in multiple cancer types.
SEATTLE, Oct. 23, 2024 (GLOBE NEWSWIRE) -- Perspective Therapeutics, Inc. (“Perspective” or the “Company”) (NYSE AMERICAN: CATX), a radiopharmaceutical company that is pioneering advanced treatment applications for cancers throughout the body, today announced six updates on the Company’s radiopharmaceutical programs being presented at the 37th Annual Congress of the European Association of Nuclear Medicine ("EANM") held in Hamburg, Germany, from October 19-23, 2024.
“The preclinical studies and first-in-human imaging data presented with [212Pb]Pb-PSV359, our novel cyclic peptide targeting fibroblast activation protein-alpha, are very encouraging and validate the potential of this radiopharmaceutical in treating a variety of epithelial-derived cancers,” said Thijs Spoor, Perspective’s CEO. “We also note the valuable contributions from our scientists, collaborators and independent investigators to advancing the development of our potential new medicines, including updated safety and efficacy observations of [212Pb]Pb-VMT-α-NET.”
[212Pb]Pb-PSV359
Presentation One: Preclinical evaluation and first-in-human imaging of [203/212Pb]Pb-PSV359, a novel cyclic peptide targeting fibroblast activation protein-alpha (FAP)
Summary: Lead-212 (212Pb; alpha-particle therapy) and lead-203 (203Pb; SPECT imaging) are an elementally identical isotope pair for image-guided, targeted-alpha-particle therapy. High-throughput screening of approximately 3 billion amino acid sequences and affinity maturation identified PSV359, a cyclic peptide targeting human fibroblast activation protein ("hFAP"), which is commonly overexpressed in a variety of cancers. The purpose of this study was to conduct the in vitro and in vivo evaluation of [203Pb/212Pb]Pb-PSV359, and present first-in-human SPECT/CT imaging of [203Pb]Pb-PSV359.
The findings of the study demonstrated that [212Pb]Pb-PSV359 exhibits strong binding affinity (Kd=1.8 nM, Ki=0.4 nM) and selectivity for hFAP. Preclinical biodistribution and imaging studies revealed strong tumor uptake of [212Pb]Pb-PSV359 with fast renal clearance and low background in off-target tissues. Furthermore, strong anti-tumor efficacy of [212Pb]Pb-PSV359 was found in both HT1080-hFAP (FAP on cancer cells) and U87MG (FAP in stromal tissues) xenograft models. First-in-human SPECT/CT images of [203Pb]Pb-PSV359 from an independent investigator revealed strong tumor uptake, fast clearance through the renal system, low accumulation in normal organs, and long tumor retention in all three patients with FAP expressing cancers.
Presenter: Brianna S. Cagle, PhD, Research Scientist, Perspective Therapeutics
[203Pb]Pb-VMT-α-NET
Presentation Two: Impact of molar activity on [203Pb]Pb-VMT-α-NET biodistribution profile in mice bearing neuroendocrine tumor xenograft
Summary: Hematotoxicity limits radiopharmaceutical therapy (RPT) targeting somatostatin receptor 2 (“SSTR2”). Somatostatin agonists and antagonists bind to bone marrow cells and lymphocytes in humans and mice. The molar activity (“MA”) of a given RPT impacts radioactivity absorbed dose to normal tissues and tumors by changing the “hot” to “cold” stoichiometry. The purpose of this study was to develop an understanding of how the MA of SSTR2 agonist [203Pb]Pb-VMT-α-NET (an imaging surrogate for [212Pb]Pb-VMT-α-NET) impacts its biodistribution in tumor-free and SSTR2+ tumor bearing mice.
Overall findings of the study demonstrated that the MA of [203Pb]Pb-VMT-α-NET impacts the uptake in low-SSTR2 expressing organs. Results suggest that a “sweet spot” of total injected mass of [203Pb]Pb-VMT-α-NET (<0.5 nmol) can be found in which the tumor to normal tissue ratios can be found. These findings exemplify a strategy that Perspective uses to optimize the therapeutic window of its proprietary RPTs.
Presenter: D. Liu, PhD, Senior Research Scientist, Perspective Therapeutics
Presentation Three: Interim results of [212Pb]VMT-α-NET Targeted Alpha Therapy in Metastatic Gastro-entero-pancreatic Neuroendocrine Tumors: First In-human Clinical Results on Safety and Efficacy
Summary: This is an investigator led, exploratory first-in-human use of [212Pb]Pb-VMT-α-NET in adult patients with unresectable or metastatic SSTR2-positive neuroendocrine tumors ("NETs") and medullary thyroid carcinomas in a compassionate setting in India. This presentation, with a data cutoff date of September 15, 2024, focused on 10 patients with well-differentiated gastroenteropancreatic NETs (“GEP-NETs”). These patients were treated with [212Pb]Pb-VMT-α-NET at a dosage of 67 µCi/kg body weight, with an interval of 8 weeks for up to 6 cycles.
Treatment was well-tolerated with a modest and manageable adverse effect profile. Confirmed tumor responses per RECIST 1.1 were observed in six of ten GEP-NETs patients. The investigator concluded that the toxicity profile suggests the potential for dose escalation to achieve optimal treatment responses. Long term survival data will mature with continued follow-up.
Presenter: Ishita B. Sen, DNB, Director and Head of the Department of Nuclear Medicine & Molecular Imaging at Fortis Memorial Research Institute (FMRI), Gurgaon
Presentation Four: Image guided evaluation of [212Pb]VMT-α-NET in metastatic Neuroendocrine tumors: Bio distribution and Dosimetry
Summary: The aim of this analysis was to assess the biodistribution and image-guided dosimetric estimates of [212Pb]Pb-VMT-α-NET peptide used for targeted alpha therapy in patients with GEP-NETs.
Dosimetry estimates were collected from five of the patients as described in Presentation Three. The results demonstrated that the SPECT/CT imaging with [212Pb]Pb-VMT-α-NET showed prompt tumor accumulation, high tumor retention, and rapid renal excretion in all patients. Overall, the findings suggest that post-treatment imaging of [212Pb]Pb-VMT-α-NET is feasible and can serve as a valuable tool to evaluate and monitor patients through a full course of treatment. Further investigation in a greater number of patients is needed to develop and validate post-treatment Pb-212 imaging and dosimetry for clinical translation.
Presenter: Dharmender Malik, MD, Fortis Memorial Research Institute (FMRI)
Investigator-Led Preclinical Research
Presentation Five: Evaluation and Design of New Chelators using Density Functional Theory Modeling: Implications for Improved Performance of 203Pb/212Pb-based Theranostic for Cancers
Summary: One of the key factors leading to the success of targeted theranostics is the sophisticated matching of the chelator to the specific radionuclide, ensuring stability and targeted delivery. The purpose of this study was to evaluate multiple chelators for imaging and therapeutic radionuclides, and newly designed chelator compositions to potentially optimize for the Pb isotopes. Multiple chelators extensively used in targeted theranostics (i.e., DOTA, NOTA, and TETA) were investigated with imaging (e.g., 68Ga, 64Cu, 111In) and therapeutic radionuclides (e.g., 177Lu, 90Y).
The study revealed how each chelator reacts with imaging and therapeutic radionuclides, optimizing the chelating form for the respective radionuclides. The results confirmed the superior performance of the modified chelators when compared to conventional forms and thus validated this computational strategy to be an effective tool for customizing chelators for targeted theranostics. Ongoing studies are expected to suggest novel chelator compositions designed for improved stability and specificity for 203Pb/212Pb theranostic radionuclides.
Presenter: Dongyoul Lee, PhD, Department of Physics and Chemistry, Korea Military Academy
Presentation Six: Development of 203Pb Labeled SSTR-Targeting Peptides as Surrogates for 212Pb Labeled Radiopharmaceuticals
Summary: SSTR2 is a key target molecule for peptide receptor radionuclide therapy (PRRT) in NETs. The purpose of this study was to assess the feasibility of 203Pb labeled peptides as surrogates for 212Pb labeled radiopharmaceuticals. SSTR2 agonists (i.e., DOTATATE, PSC-PEG2-TOC) and antagonists (i.e., DOTA-LM3, DOTA-PEG2-LM3) were radiolabeled with 203Pb and evaluated to identify the most promising candidate for PRRT.
The SSTR2-targeting peptides investigated exhibited excellent radiolabeling performance and stability with 203Pb. Imaging data suggested the feasibility of using 203Pb-labeled radiopharmaceuticals as surrogates for 212Pb counterparts, potentially enabling 203Pb image-guided 212Pb therapy for NETs. Further studies are planned to evaluate the therapeutic potential of 212Pb labeled radiopharmaceutical candidates in NET mouse models.
Presenter: Jung Woo Byun, Department of Nuclear Medicine, Seoul National University
For more details on the presentations, the abstract book is available online at https://link.springer.com/article/10.1007/s00259-024-06838-z.
About Perspective Therapeutics, Inc.
Perspective Therapeutics, Inc., is a radiopharmaceutical development company that is pioneering advanced treatment applications for cancers throughout the body. The Company has proprietary technology that utilizes the alpha emitting isotope 212Pb to deliver powerful radiation specifically to cancer cells via specialized targeting peptides. The Company is also developing complementary imaging diagnostics that incorporate the same targeting peptides, which provide the opportunity to personalize treatment and optimize patient outcomes. This "theranostic" approach enables the ability to see the specific tumor and then treat it to potentially improve efficacy and minimize toxicity.
The Company's melanoma (VMT01) and neuroendocrine tumor (VMT-α-NET) programs have entered Phase 1/2a imaging and therapy trials for the treatment of metastatic melanoma and neuroendocrine tumors at several leading academic institutions. The Company has also developed a proprietary 212Pb generator to secure key isotopes for clinical trial and commercial operations.
For more information, please visit the Company's website at www.perspectivetherapeutics.com.
Safe Harbor Statement
This press release contains forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995. Statements in this press release that are not statements of historical fact are forward-looking statements. Words such as "may," "will," "should," "expect," "plan," "anticipate," "could," "intend," "target," "project," "estimate," "believe," "predict," "potential," or "continue" or the negative of these terms or other similar expressions are intended to identify forward-looking statements, though not all forward-looking statements contain these identifying words. Forward-looking statements in this press release include express or implied statements concerning, among other things, the Company's ability to pioneer and develop advanced treatment applications for cancers throughout the body; expectations regarding the timing and advancement of the Company's clinical and preclinical programs; the potential of [212Pb]Pb-PSV359 to treat a variety of epithelial-derived cancers; the feasibility of post-treatment imaging of [212Pb]Pb-VMT-α-NET to evaluate and monitor patients; the potential to modify chelators for targeted theranostics; the potential identification of novel chelator compositions to offer improved stability and specificity for 203Pb/212Pb theranostic radionuclides; the feasibility of using 203Pb-labeled radiopharmaceuticals as surrogates for 212Pb counterparts, potentially enabling 203Pb image-guided 212Pb therapy for NETs; plans for future studies to evaluate the therapeutic potential of 212Pb labeled radiopharmaceutical candidates; the ability of the Company's proprietary technology that utilizes the alpha-emitting isotope 212Pb to deliver powerful radiation specifically to cancer cells via specialized targeting peptides; the opportunity to personalize treatment and optimize patient outcomes using the Company's complementary imaging diagnostics that incorporate the same targeting peptides; the Company's expectation that its "theranostic" approach enables the ability to see specific tumors and then treat them to potentially improve efficacy and minimize toxicity; the Company's ability to develop a proprietary 212Pb generator to secure key isotopes for clinical trial and commercial operations; expectations regarding the potential market opportunities for the Company's product candidates; the potential functionality, capabilities, and benefits of the Company's product candidates and the potential application of these product candidates for other disease indications; the Company's expectations, beliefs, intentions, and strategies regarding the future; the Company's intentions to improve important aspects of care in cancer treatment; and other statements that are not historical fact.
The Company may not actually achieve the plans, intentions, or expectations disclosed in the forward-looking statements, and you should not place undue reliance on the forward-looking statements. These forward-looking statements involve risks and uncertainties that could cause the Company's actual results to differ materially from the results described in or implied by the forward-looking statements. Certain factors that may cause the Company's actual results to differ materially from those expressed or implied in the forward-looking statements in this press release are described under the heading "Risk Factors" in the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC"), in the Company's other filings with the SEC, and in the Company's future reports to be filed with the SEC and available at www.sec.gov. Forward-looking statements contained in this news release are made as of this date. Unless required to do so by law, we undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.
FAQ
What were the key findings for [212Pb]Pb-PSV359 presented at EANM 2024 for CATX?
How effective was [212Pb]Pb-VMT-α-NET in treating GEP-NETs patients for CATX?
What were the dosing details for [212Pb]Pb-VMT-α-NET treatment presented by CATX at EANM 2024?
